Section 11.3 Acceleration – Flashcards
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The rate at which velocity changes is called ________?
answer
acceleration
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In terms of speed and direction, in what ways can an object acceleration?
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It can change its speed, direction, or both.
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Because acceleration is a quantity that has both magnitude and direction, it is a(n) _______.
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vector
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Is the following true or false? Acceleration is the result of increases or decreases in speed.
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false
increases or decreases in speed and direction.
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Ignoring air resistance, a rock in free fall will have a velocity of ________ after 4.0 seconds.
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39.2 m/s
acceleration of gravity=9.8 m/s ^2
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A horse on a carousel that is moving at a constant speed is accelerating because ______________.
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its direction is constantly changing
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Describe constant acceleration.
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constant acceleration is a steady change in velocity
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Type the equation used to calculate the acceleration of an object.
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Acceleration=change in velocity/total time
or
final velocity- initial velocity/ change in time
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Is the following sentence true or false? When the final velocity is less than the initial velocity of an object, the acceleration is negative.
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true
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A skateboarder begins down a ramp at a speed of 1.0 m/s. After 3 seconds, her speed has increased to 40 m/s. Calculate her acceleration.
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1.0 m/s
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A speed-time graph in which the displayed data forms a straight line is an example of a(n) ________.
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constant acceleration
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The measure of how fast a velocity is changing at a specific instant is known as ____________.
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instantaneous acceleration
