College Prep Physics A – Review
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On a time distance-time if the line is diagonal, what does that show about the velocity?
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Velocity is constant
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On a time distance-time if the line is horizontal, what does that show about the velocity?
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Object is still
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The slope of a distance-time tells us what?
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The velocity of an object
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Does distance need a frame of reference?
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No
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What is displacement?
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Change in position
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How is velocity defined?
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Distance/Time=Velocity
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Is velocity a vector quantity?
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Yes
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What is the unit for velocity?
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m/s
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What is speed?
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The magnitude of velocity. Also a measure of how fast something is moving.
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Is speed a scalar quantity?
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Yes
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What is acceleration?
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The rate at which velocity changes.
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What is the unit for acceleration?
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m/s^2
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On a velocity-time graph- the slope tells us what?
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The acceleration of an object.
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Gravitational Force-
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An attractive force that acts between any two objects.
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Electromagnetic Force-
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This is the force that gives materials their strength, ability to bend, squeeze, stretch, or shatter.
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Strong Nuclear Force-
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Hols particles in the nucleus together.
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Weak Force-
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Involved in the radioactive decay of some nuclei.
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What is the weakest of the action at a distance force?
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Gravitational Force.
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What are the action at a distance forces?
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Gravitational, Electromagnetic, Strong Nuclear, and Weak
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Applied Force-
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a force which is applied to an object by a person or another object
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Normal Force-
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the force perpendicular to a surface that prevents an object from falling through the surface
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Friction-
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effort expended in rubbing one object against another
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What is the force that allows us to walk?
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Friction.
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Air Resistance-
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the fluid friction experienced by objects falling through the air
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Tension-
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Force transmitted through a string, rope, or wire when it is pulled tight by forces acting from each end.
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Spring Force-
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The force exerted by a compressed or stretched spring upon any object that is attached to it
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If something is flying through the air- which way does air resistance point?
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Up. The opposite of gravitational forces.
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If an object is traveling with a constant velocity, what is the acceleration?
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Zero.
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When you apply forces on an object, how much frictional force results?
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The same amount as applied.
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How can you weight on Earth be different from your weight on another planet?
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If you go to a place where the gravitational force is less than it is on Earth, then your weight will decrease.
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What would the velocity vector look like the the object was moving in a circular motion?
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Tangent to the circle.
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What is one-dimensional motion?
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Moves in a straight line along a level surface.
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Two-dimensional motion-
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Any object moving through the air or two dimensions.
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What is periodic motion?
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Any motion that repeats itself.
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Rotation-
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the act of rotating on an INTERNAL axis.
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Revolution-
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When an object turns about an EXTERNAL axis.
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Are horizontal and vertical components of motion independent of eachother?
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Yes.
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Describe horizontal velocity.
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Constant
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Describe vertical velocity.
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Accelerating, due to gravity.
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Where is the force directed towards while moving in a circle?
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Toward the center of the circle.
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Does acceleration and force travel in the same direction?
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Yes.
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Why do guns recoil when shot?
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The momentum must be equal to that of the bullet.
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Which has a stronger recoil- Big guns or little guns?
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Little.
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What has more inertia, bus or car?
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Bus.
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What is safer, cars or buses?
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Buses.
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How do you decrease a force in a collision?
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Increase the time.
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Does the total momentum during a collision change?
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No.
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Work-
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Transfer of energy by mechanical means.
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Is energy ever lost?
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No.
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What can energy be transferred to?
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Heat, light sound, etc.
