Physical Science Motion and Force Study Guide

The rate of change in velocity; how quickly velocity is changing

• speed

• velocity

• resultant speed

• acceleration

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The unit for acceleration is

• m²/s

• m/s

• m/s²

• m/s³

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If velocity and acceleration are in the same direction an objects ____________.

• speeds up

• slows done

• stops

• turns

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If velocity and acceleration are in the opposite direction, the object _________.

• stops

• none

• slows down

• speeds up

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A car moving at 80 mph has a speed of 35.8 m/s. What acceleration would it have if it took 5.0 s to come to a complete stop?

• -6.16

• 3.12

• -7.16

• 4.15

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If a ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s² for 3 seconds, what will its final velocity be?

• 170 m/s

• 140 m/s

• 150 m/s

• 160 m/s

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An object falls from a building. Ignoring air resistance, its acceleration due to gravity is 9.8 m/s². How long will it take before it reaches a speed of 49 m/s?

• 5s

• -5s

• 4s

• -4s

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What is the acceleration of a car that travels in a straight line at a constant speed?

• 0

• 9.8 m/s

• 4 m/s

• 2 m/s

A ball is dropped at the top of building. After 2 seconds it's velocity is measured to be 19.6 m/s. What is its acceleration?

• 19.6 m/s

• 9.8 m/s

• 0 m/s

• 29.4 m/s

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What does the negative sign mean in acceleration problems?

• an objects is deceleration

• going in the opposite direction

• going in the same direction

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