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Hewitt 7.4 hw

Authored by Michelle Tseng

Physics

9th Grade - University

Used 1+ times

Hewitt 7.4 hw
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2 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Compared with a car moving at some original speed, how much work must the brakes of a car supply to stop a car that is moving twice as fast? How will the stopping distances compare?

It takes twice the work and twice the stopping distance.
There is no change in the work and stopping distance.
It takes half the work and half the stopping distance.
It takes four times the work and four times the stopping distance.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If you push a crate horizontally with 100 N across a 10-m factory floor and the friction between the crate and the floor is a steady 70 N, how much kinetic energy does the crate gain?

1,000 J
300 J
700 J
400 J

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