Honors Conceptual Physics Spring Final
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When a horizontal force of 15N is applied to a box on a flat horizontal table, the box doesn't move. What must the force of static friction be?
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15N
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A hockey puck has a coefficient of kinetic frictions of 0.05 when on ice. if the puck exerts a normal force of 12 N what is the force of friction on the puck?
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0.6N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. The coefficient of kinetic friction between the crate and the floor is 0.560. What is the magnitude of the force needed to push the crate at a constant velocity?
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406 N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. The coefficient of kinetic friction between the crate and the floor is 0.560. what is the weight of the block?
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70N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. The coefficient of kinetic friction between the crate and the floor is 0.560. What is the normal force on the block
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70N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. if the coefficient of kinetic friction is 0.30, what us the frictional force on the block?
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21 N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. The coefficient of kinetic friction between the crate and the floor is 0.560. what is the net force on the block ?
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4N
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a 725 N crate sits level on a warehouse floor. Due to its shape it cannot be picked up using a forklift, it must be pushed. The coefficient of kinetic friction between the crate and the floor is 0.560. What is the acceleration of the block from the net force?
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0.57 m/s^2
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a block is moved at a constant speed over a horizontal surface. What would the acceleration of the block if Uk=0?
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0 m/s^2
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a horizontal force of 400 N is required to pull a 1760 N trunk across the floor at a constant speed. what is the coefficient of sliding friction?
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0.23
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how much force must be applied to push a 1.35 kg book across the desk at a constant speed if the coefficient of sliding friction is 0.30?
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405 N
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a 1500.0 N force is exerted on a 200.0 kg crate to move it across the floor. if the crate moves and its coefficient of friction is 0.250, what is the acceleration?
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5 m/s^2
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a 20,000 N car is parked on an incline that mames an angle of 30 degrees with the horizontal. If the maximum force the brakes can withstand is 12000 N, will the car remain at rest?
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yes
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a 65 N boy sits on a sled weighing 52 N on a horizontal surface. The coefficient of friction between the sled and the snow is 0.012 . what is the magnitude of the frictional force? The sled is pulled at a constant speed by a rope held horizontally. what is the tension on the rope?
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1.404 N
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an object weighing 40 N rests on a surface. The coefficient of friction between the surface and object is 0.35. What is the frictional force between the object and the surface? A 20 N force is applied to pull the object horizontally. What is the magnitude of the unbalanced force? what ist he acceleration of the box?
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14 N; 6N; 1.5 m/s^2
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Mr. Emrick drags a cart across the RA hallway and exerts a force of 200N. If the cart has a mass of 50Kg and it is being accelerated it is being accelerated at 2 m/s^2, what is the force of friction?
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1000N
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A car is parked on a 36 degree slope. It weighs 12000 N. The brake fail and the car starts to roll down the hill. It has a force of rolling static friction of 3600N. what is the acceleration of the car?
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2.88 m/s^2
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A car is parked on a 36 degree slope. It weighs 12000 N. The brake fail and the car starts to roll down the hill. It has a force of rolling static friction of 3600N. after it moved 30.0 m how fast is it moving?
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6.57 m/s
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a 25 kg block travels down an incline that it is 15 m long. The incline is angled at 44 degrees. the coefficient of kinetic friction is 0.38. what is the force of friction on the block?
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68N
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a 25 kg block travels down an incline that it is 15 m long. The incline is angled at 44 degrees. the coefficient of kinetic friction is 0.38. find acceleration.
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4.21 m/s^2
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a 25 kg block travels down an incline that it is 15 m long. The incline is angled at 44 degrees. the coefficient of kinetic friction is 0.38. How long will it take for the block to reach the bottom of the incline?
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2.7 s
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. what is the weight?
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200N
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. find perpendicular force
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188N
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. Find parallel force
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68 N
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. determine normal force
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188N
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. determine force of friction
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n/a
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a 20 Kg object sits on an incline with an angle of 20 degrees from the horizontal. determine acceleration
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n/a
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the most massive car ever built is moving down a 10 degree slope. When the brakes are used the net force acting on the car is -20000 N. If the coefficient of kinetic friction is 0.797 what is the car's mass
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3340 kg
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if a block travels down a 60 degree incline at 5 m/s^2, what is the coefficient of kinetic friction?
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0.18
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A coin is placed on the cover of a book. The book is lifted so that it makes a 30 degree angle with the horizontal. The coin slides, what i the coefficient of static friction?
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0.78
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on his way to college, Russell drags his suitcase 15.0 m from his house to his car at a constant speed with a horizontal force of 95.0 N. How much work does Russell do to overcome force of friction?
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1425 J
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a 30 kg child climbs a tree to rescue her cat 8.0 m off the ground. How much work does she do in order to reach the cat?
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2400J
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marissa does 3.2 J of work to lower the window shade in her bedroom a distance of 0.8 m. how much force must marissa exert on the window shade?
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4N
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if galileo dropped a 5.0 kg cannon ball to the ground from a height of 12 m, what would have been the change in PE of the cannon ball?
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600 J
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Rags to Riches ran an average speed of 16.23 m/s. if her and the jockey had a combined mass of 550.0 kg, what was her KE as they crossed the finish line?
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72438.5 J
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Brittany is changing her tires on a hill 20.0 m high. She trips and drops the 10.0 kg spare tire. which rolls with an initial speed of 2.00 m/s. What is the speed at the top of the next hill which is 5.00 m high?
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17.44 m/s
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* if a jumping bean has a mass of 2.0 g jumps 1.0 cm from you hand, how much potential energy has it gained in reaching its highest point? what is its speed as the bean lands back in your hand?
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0.45 m/s
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a 460 N actress is hoisted above the stage with a force of 60 N on a rope around a pulley system. What is the mechanical advantage of the pulley system?
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7.7
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a windmill grind with a force of 90 N. It's sails have a radius of 6.0 m blown by a wind with a force of 15 N. the axle of the gindstone has a radius of 0.50 m. What is the ideal mechanical advantage of the wheel? what is the actual mechanical advantage? what is the efficiency?
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12; 6; 50%
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if a pyrmid has an incline with an ideal mechanical advantage of 4.00 and the pyramid is 15.0 m tall, how much of an incline is needed in order for the builders to reach the top?
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14.5 degrees
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2 components for the force of gravity on an incline?
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parallel and perpendicular
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angle that cause greater acceleration due to greater parallel forces?
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;45
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variable that causes all 5 forces to change when it is changed?
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mass
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F=ma is also known as
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newton's law
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when 2 surface are in contact what force and variable exists?
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friction and coefficient of friction
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as normal force increases, this force does not decrease
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gravity
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a critical angle is one that...
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causes parallel force to overcome static friction
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a spring is compressed 10m when a force of 5N is applied. How far does it compress when 10N is applied?
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20m
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a spring is compressed 10m when a force of 5N is applied. how much elastic potential energy is stored from each of these stretches?
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25 J; 100J
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what is the elastic force a spring will exert if it has a k=175 N/m and is stretched 30 cm? how much potential energy is stored from this stretch?
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52.5 N; 7.875 J
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how do the same charged behave towards each other
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repel
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how do opposing charge act towards each other
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attract
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q value for potassium (K)
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+q
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q value for flourine (F)
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-q
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q value for nitrogen (N)
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-3q
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q value for argon (Ar)
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0q
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q value for magnesium (Mg)
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+2q
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q value for cadmium (Cd)
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+2q
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q value for oxygen (O)
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-2q
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what is the value of K in breathable air?
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9.0x10^9 N*m^2/c^2
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charging by touching
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grounding
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charging without touching
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induction
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charging by rubbing
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friction
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3 good conductors
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Ag, Cu, Al
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3 good insulators
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glass, wool, rubber
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3 good semiconductors
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C, Ga, Ge
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a drinking glass made of wool scoots across a table cloth. When you go to pick it up you are shocked by static electricity. What must the tablecloth be made of?
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hair or wool
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the charge of an electron is 1.6x10^-19 C. How many electrons make a charge of 1 C
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6.25x10^18 e-
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by how much is the electrical force between a pair of ions reduced when their separation distance is tripled?
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1/9
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2 rubber balloons have the same electrical charge evenly spread across 2 surfaces. If the repelling force is 2.5 N and the distance between is 0.30 m, how much charge is each balloon?
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5x10^-6 C
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consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's law: if the charge on one of the particles is doubled, the force is....
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doubled
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consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's law: if the charge on both particles is doubled, the force is
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quadrupled
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consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's law: if the distance between the particles halved, the force is
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quadrupled
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consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's law: if the distance is halved and the car of both particles is doubles, the force is______times as great
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16
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if an electron loses 1.4x10^15 J of energy traveling from the cathode to the screen of Jeffrey's old computer, across what potential difference must it travel the 1.636x10^-13m?
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8800 V
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while getting out of a car, victor builds up a charge on his body as he slides acrross the cloth car seats. When he attempts to shut the door, his hand discharges 12,000 V through a uniform electric field of 3.0x10^6 N/C and a charge of 5.33x10^-9. how far is his hand from the foor when the spark jumps?
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4x10^-3 m
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a lightning bolt from a cloud with a charge of 8.89 C hits a tree after traveling 200 m to the ground through an electric field of 2.0x10^6 N/C. What is the potential difference between the cloud and the tree just before the lightning bolt strikes?
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4x10^8 V (EPVOLTS)
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when sugar is poured from the box into the sugar bowl, the rubbing of sugar grains creates a static electric charge that repels the grains, causes sugar to go flying out in all directions. If each of 2 sugar grains acquires a charge of 3.0x10^-11 C at a separation of 8.0x10^-5 with what force will they repel each other?
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1.3 x10^-3 N (coulomb's )
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Boppo the clown carries two mylar balloons that rub against a circus elephant, causing the balloons to separate. Each balloon acquires 2.0x10^-7 C of charge. How large is the electric force between them when they are separated by a distance of 0.50 m?
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1.4x10^-3 N (Coulomb)
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inez's hairspray spreads out before reaching her hair partly because of the electrostatistic charge on the hairspray droplets. if two drops of hairspray repel each other with a force if 9.0x10^9 N at a distance of 0.07 cm, what is the charge on each of the equally charged drops of hairspray?
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7x10^-13 C (Coulomb's)
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Each of 2 hot-air balloons acquires a charge of 3.0x10^-5 on its surface as i travels trough the air. How far apart are the balloons if the electrostatistic force between them is 8.1x10^2 N?
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0.1 m (coulomb)
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Gordon, the night custodian dusts off a classroom globe with a feather duster causing the globe to acqurie a charge of 8.0x10^-9 C what i the magnitude of the electric field at a point 0.40 m form the center of the charged globe
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450 N/C (EFIELD)
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Justine's hair dryer has a resistance of 9.00 Ohms when first turned on how much currect does the hair dryer draw from the 110. -V lin in Justine's house?
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12.2 amps
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If a calculator has a 1.60 C charge encounters 19.0 Ohm of resistnce every 2.00 seconds . What is the potential difference of the battery?
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1.52 V
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how much power is sed by an ultrasonic jewelry cleaner tht draws 0.042 A of current from a 120 V line?
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5.04 watts
