7. Friction, Inclines, Systems

Kinetic Friction

7. Friction, Inclines, Systems

# Kinetic Friction

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concept

## Kinetic Friction Problems

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2

Problem

ProblemPushing a 10-kg toolbox across the floor, you find that the box moves at a constant speed when you push horizontally with a force of 39 N. What is the coefficient of kinetic friction between the floor and the toolbox?

A

0.2

B

0.4

C

2.5

3

Problem

ProblemYou push on a 3-kg box to give it an initial speed of 5 m/s across a floor. If μ_{k} = 0.3, how far does the box travel before coming to a stop?

A

8.6m

B

2.9m

C

7.7m

D

4.3m

4

example

## Pushing Down on a Block with Friction

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PRACTICE PROBLEMS AND ACTIVITIES (23)

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- A ball is shot from a compressed-air gun at twice its terminal speed. a. What is the ball's initial accelerat...
- A 10 kg crate is placed on a horizontal conveyor belt. The materials are such that mu(s) = 0.5 and mu(k) = 0.3...
- A 250 g ball is launched with a speed of 35 m/s at a 30° angle. A strong headwind exerts a constant horizontal...