7. Friction, Inclines, Systems

Kinetic Friction

7. Friction, Inclines, Systems

# Kinetic Friction - Video Tutorials & Practice Problems

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## Kinetic Friction Problems

Video duration:

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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 (26)

- In a laboratory experiment on friction, a 135-N block resting on a rough horizontal table is pulled by a horiz...
- A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the...
- A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the...
- A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, ...
- A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, ...
- You throw a baseball straight upward. The drag force is proportional to υ2. In terms of g, what is the y-compo...
- You throw a baseball straight upward. The drag force is proportional to υ2. In terms of g, what is the y-compo...
- (b) If the skydiver's daughter, whose mass is 45 kg, is falling through the air and has the same D (0.25 kg/m)...
- A 45.0-kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, ...
- So-called volcanic 'ash' is actually finely pulverized rock blown high into the atmosphere. A typical ash part...
- What is the magnitude of the acceleration of a skydiver at the instant she is falling at one-half her terminal...
- An E. coli bacterium can be modeled as a sphere that has the density of water. Rotating flagella propel a bact...
- An object with cross section A is shot horizontally across frictionless ice. Its initial velocity is v₀ₓ at t₀...
- A 1.0-cm-diameter, 2.0 g marble is shot horizontally into a tank of 20°C olive oil at 10 cm/s. How far in cm w...
- b. A 4.0-cm-diameter, 55 g ball is shot horizontally into a tank of 40°C honey. How long will it take for the ...
- a. A spherical particle of mass m is shot horizontally with initial speed v₀ into a viscous fluid. Use Stokes'...
- A medium-sized jet has a 3.8-m-diameter fuselage and a loaded mass of 85,000 kg. The drag on an airplane is pr...
- So-called volcanic 'ash' is actually finely pulverized rock blown high into the atmosphere. A typical ash part...
- (b) Below what speed does a 3.0-mm-diameter ball bearing in 20°C air experience linear drag?
- (a) Above what speed does a 3.0-mm-diameter ball bearing in 20°C water experience quadratic drag?
- 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...
- A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic f...
- (II) A package of mass m is dropped vertically onto a horizontal conveyor belt whose speed is v=1.5m/s , and t...
- A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic f...