Unit 2 Test Study Guide (Friction,Gravity and Newton’s 1) – Flashcards
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Why is it important to keep accurate records, notes and charts while doing an experiment?
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So experiment can be repeated the same way again
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why is it easy to slip when there is water on the floor
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there is less friction
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what factors impact the amount of friction between objects
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the amount of force between the objects and the roughness of the surfaces
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a box being pushed across the floor (type of friction)
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sliding
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a bird flying through the air air (type of friction)
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sliding
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a book sitting on a table (type of friction)
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static
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riding a skateboard (type of friction)
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rolling
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which of following examples has the greatest amount of friction between the object
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a box being pushed across the floor
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why must you exert a force to pick up an object ? what must you overcome
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an object at rest tends to stay at rest you must overcome gravity
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Law of Universal Gravitation
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Gravitational force increases as mass increases Gravitational force decreases as distance increases
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weight
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measurement of how hard gravity is pulling on that object
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mass
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amount of matter in an object does not change based on location
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if earths mass doubled without changing its size, what would happen to your weight
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your weight will double because of the increase in gravitational force
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how would the gravitational force between 1kg of lead and earth compare to the gravitational force between 1kg of marshall and Earth
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the gravitational force would be equal because the masses are equal
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a penny is dropped from the top of a tall stairwell. what is the penny's velocity after it has fallen for 4s
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39.2
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terminal velocity
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is the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
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what is not projectile motion
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swimming in a pool of water
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the acceleration of an object depends on the mass of the object and the amount of force applied
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newton's 2
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whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first
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newton's 3
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according to newton's 2 law how can you increase the acceleration of an object that is pushed by a force
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reduce the mass or increase the force applied
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when you ride the bus, why do you fall forward if you are standing and the bus moving
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when the bus stops your inertia hasn't been changed and you will continue in motion
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when a soccer ball is kicked, why don't the action and reaction forces cancel each other out
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the forces act on opposite objects
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what would have to have to happen to the force applied if you wanted to accelerate two objects with different at the same rate
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you would have to use a greater force with the larger object
