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Physics
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5 Dec 2020

The work done by a frictional force is:

A) Can be zero

B) Can be positive

C) Can be negavtive

D) All of the above

Booster class
Mechanics 1
Skill
Understanding frictional forces
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Rishabh Jain
Rishabh JainLv6
5 Dec 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A large crate filled with physics laboratory equipment must be moved up an incline onto a truck.

uploaded image

(1) The crate is at rest on the incline. What can be concluded about the force of friction acting on the crate?

A. the frictional force points up the incline

B. the frictional force points down the incline

C. the frictional force is zero

(2) A physicist attempts to push the crate up the incline. The physicist senses that if he applies slightly more force the crate will move up the incline but cannot muster enough strength to get the motion started. What can be concluded about the force of friction acting on the crate?

A. the frictional force points up the incline

B. the frictional force points down the incline

C. the frictional force is zero

(3) The first physicist gets a second physicist to help. They both push on the crate, parallel to the surface of the incline, and it moves at constant speed up the incline. How does the force exerted by the two physicists on the crate compare with the force of friction on the crate?

A. force of 2 physicists < force of friction

B. force of 2 physicists = force of friction

C. force of 2 physicists > force of friction

A person pushes a 16.0-kg shopping cart at a constant velocity fora distance of 26.0 m. She pushes in a direction 23.0° below thehorizontal. A 52.0-N frictional force opposes the motion of thecart.
(a) What is the magnitude of the force that the shopperexerts?
N

(b) Determine the work done by the pushing force.
J

(c) Determine the work done by the frictional force.
J

(d) Determine the work done by the gravitational force.
J

A 237-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 47.1 ° below the horizontal. The coefficient of kinetic friction is 0.217. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?

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