   Chapter 5, Problem 8P

Chapter
Section
Textbook Problem

A block of mass m = 2.50 kg is pushed a distance d = 2.20 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle θ = 25.0° below the horizontal as shown in Figure P5.8. Determine the work done by (a) the applied force, (b) the normal force exerted by the table, (c) the force of gravity, and (d) the net force on the block. Figure P5.8

(a)

To determine
The work done by the applied force.

Explanation

Given Info:

The mass of the block is 2.50kg .

The magnitude of applied force is 16.0N .

The angle with which the force is acting is 25.0° .

The distance that the block is moved is 2.20m .

Formula to calculate the work done is,

W=(Fcosθ)d

• θ is the angle between the force vector and the displacement vector
• F is the force
• d is the magnitude of displacement

Substitute 16.0N for F, 25

(b)

To determine
The work done by the normal force excreted by the table.

(c)

To determine
The work done by the force of gravity.

(d)

To determine
The work done by the net force on the block.

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