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38 Cards in this Set
- Front
- Back
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Speed is always some ____ divided by ___.
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Distance, time.
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Average speed is ____ divided by ____.
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Total distance, total time.
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Rate is ____ divided by _____. An example of this would be ______.
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One quantity divided by another quantity. Gallons per minute, pesos per dollar, points per game.
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Average speed is ____.
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The rate at which distance is covered over time.
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Instantaneous speed is _____.
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The speed at that precise instant at time.
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Instantaneous speed is found by _____.
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Calculating the average speed, over a short enough time that the speed does not change much.
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Velocity involves _____ as well as _____.
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The direction of motion as well as how fast the object is going.
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Velocity is a _______.
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Vector quantity.
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Vectors have both ____ and ___.
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Magnitude and direction.
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Velocity has a velocity which is the ______ and also a direction which is _____.
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Speed, which way the object is moving.
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A _____ is required to produce a change in either in speed (magnitude) or direction of velocity.
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Force
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For the car to round a curve, friction between the wheels and the road exerts a ____ to change the car's direction.
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Force
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For a ball bouncing from a wall, the wall exerts a ____ on the ball, causing the ball to change direction.
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Force
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Instantaneous velocity is a vector quantity having both a ____ and a ____.
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Size (magnitude) equal to the instantaneous speed at a given instant in time, and a direction equal to the direction of motion at that instant.
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Acceleration is the rate at which ____ changes.
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Velocity
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Our bodies don't feel velocity if the velocity is ___.
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Constant.
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Our bodies feel _____
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Acceleration
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Acceleration can be either a ____ or ____.
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A change in the object's speed, direction of motion.
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Acceleration is also a _____.
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Vector quantity.
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Because acceleration is a vector quantity, it has both ___ and ___.
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Magnitude, direction.
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The direction of the acceleration vector is that of the ______.
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Change in velocity.
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Acceleration refers to ____. We even refer to a decrease in velocity (slowing down) as an ____.
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Any change in velocity, acceleration.
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The direction of the acceleration vectors is that of the change in____.
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Velocity.
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If velocity is _____, the acceleration is in the ____ direction as the velocity.
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Increasing, same.
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The direction of the acceleration vector is that of the _______.
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Change in velocity.
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If velocity is _____ the acceleration is in the ____ direction as the velocity.
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Decreasing, opposite.
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If speed is constant but velocity direction is changing, the acceleration is at ______ to the velocity.
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Right angles.
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Acceleration =
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change in velocity
__________________ elapsed time. |
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A car starting from rest, accelerates to a velocity of 20 m/s due east in a time of 5 s.
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a= 20m/s = 4m/s/s=4m/s^2
_____ 5s |
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Instantaneous acceleration is found by _______
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Calculating the average speed, over a short enough time that the speed does not change much.
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Average acceleration is the change in _______ divided by the time required to produce that change.
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Velocity
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Units of velocity are units of _____ divided by units of _____.
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Distance, time.
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The units of acceleration are units of ____ divided by units of _____. So, units of accelerations are units of ______ divided by ______ divided by units of time.
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Velocity, time. Distance, time.
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(24) Instantaneous acceleration is the acceleration at _____.
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That precise moment in time.
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Instantaneous acceleration is the rate at which ______ is changing at a given instant in time.
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Velocity
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Uniform acceleration is the _____ of acceleration.
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Simplest form.
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Uniform acceleration occurs whenever _____.
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There is a constant force acting on an object.
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Two examples of uniform acceleration that include rocks and cars could be...
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A falling rock, a car accelerating at a constant rate.
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