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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman
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Suppose the worker in Exercise 6.3 pushes downward at an

Chapter 3, Problem 4E

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QUESTION:

Suppose the worker in Exercise 6.3 pushes downward at an angle of \(30^{\circ}\) below the horizontal.

(a) What magnitude of force must the worker apply to move the crate at constant velocity?

(b) How much work is done on the crate by this force when the crate is pushed a distance of 4.5 m?

(c) How much work is done on the crate by friction during this displacement?

(d) How much work is done on the crate by the normal force? By gravity?

(e) What is the total work done on the crate?

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QUESTION:

Suppose the worker in Exercise 6.3 pushes downward at an angle of \(30^{\circ}\) below the horizontal.

(a) What magnitude of force must the worker apply to move the crate at constant velocity?

(b) How much work is done on the crate by this force when the crate is pushed a distance of 4.5 m?

(c) How much work is done on the crate by friction during this displacement?

(d) How much work is done on the crate by the normal force? By gravity?

(e) What is the total work done on the crate?

ANSWER:

Solution 4E Step 1 of 8: In the given problem, a crate of mass m=30kg is kept of the horizontal floor with coefficient of kinetic friction k =0.25 is moved by an applied force at an angle 30 0 down the horizontal plane in such a way that, the crate moves at constant velocity. It can be pictorially represented as shown below,

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