Question Detail

PHY 101 Work, Energy and Power Objective Question
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Question

When is work done by a force considered negative?
Options
A When 90° > θ > 0°.
B When θ = 0°.
C When 180° > θ > 90°.
Correct Answer
D When θ = 90°.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Work is negative when the angle θ between the force and displacement is between 90° and 180°, meaning the force has a component opposite to the direction of the displacement, like friction.

Hint

Negative work decreases the object's kinetic energy.

Question Info

Course: PHY 101
Topic: Work, Energy and Power
Type: Objective
Difficulty: Not specified
Question 385 of 1250
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