AP Physics 1 : Motion in One Dimension

Study concepts, example questions & explanations for AP Physics 1

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Example Questions

Example Question #91 : Motion In One Dimension

A drone must accelerate down a runway at   for 20 seconds until it takes off. What is the minimum length of its runway?

Possible Answers:

204 meters

420 meters

None of these

402 meters

240 meters

Correct answer:

240 meters

Explanation:

Since the drone starts from rest we use  and cross out the first term after the equals sign: initial velocity multiplied by time.

*Notice how the time units cancel

Example Question #92 : Motion In One Dimension

An astronaut drops his keys while on the moon from a height of 1.6 meters. How long will it take for them to hit the ground? 

Possible Answers:

2.3 seconds

0.57 seconds

2.1 seconds

1.4 seconds

1.2 seconds

Correct answer:

1.4 seconds

Explanation:

We are given a distance and since the object is dropped we can cross out initial velocity in the kinematic equation: . Remember to use the acceleration for gravity on the moon. It is .

Dividing and square rooting the quotient:

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