Question Detail

PHY 101 Work, Energy and Power Objective Question
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Question

The work done by gravity is equal to what change in potential energy?
Options
A W_g = PE_f - PE_i
B W_g = PE_i - PE_f
Correct Answer
C W_g = - (PE_i - PE_f)
D W_g = PE_i + PE_f
Correct Answer

Option B is the correct answer.

Detailed Explanation

The work done by the gravitational force is equal to the negative change in potential energy, or W_g = PE_i - PE_f. For example, as an object falls, PE decreases and gravity does positive work.

Hint

Think of it as work done by gravity = initial PE - final PE.

Question Info

Course: PHY 101
Topic: Work, Energy and Power
Type: Objective
Difficulty: Not specified
Question 392 of 1250
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