Question Detail

PHY 101 Work, Energy and Power Objective Question
Take CBT

Question

Which of the following statements about the conservation of mechanical energy is true when only conservative forces do work?
Options
A The sum of kinetic and potential energy is constant.
Correct Answer
B Kinetic energy alone is constant.
C Potential energy alone is constant.
D The total energy of the system always increases.
Correct Answer

Option A is the correct answer.

Detailed Explanation

Mechanical energy E is defined as the sum of kinetic energy (KE) and potential energy (PE). The principle of conservation of mechanical energy states that if only conservative forces (like gravity or spring force) do work, the total mechanical energy E = KE + PE remains constant.

Hint

Conservative forces allow energy to be stored and recovered, keeping the total mechanical energy unchanged.

Question Info

Course: PHY 101
Topic: Work, Energy and Power
Type: Objective
Difficulty: Not specified
Question 785 of 1250
Previous Course Details Next