Question Detail

PHY 101 Work, Energy and Power Objective Question
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Question

Why is the energy approach to describing motion particularly useful?
Options
A Because it always gives the exact path of motion.
B Because it is a scalar quantity and is useful when Newton's Laws are difficult to use.
Correct Answer
C Because it requires knowing all forces in detail.
D Because it only applies to objects in free fall.
Correct Answer

Option B is the correct answer.

Detailed Explanation

The energy approach is useful because energy is a scalar quantity (no direction), and it can be applied even when Newton's Laws are difficult or impossible to use. It is based on mechanical energy, the sum of kinetic and potential energy.

Hint

Scalar quantities are often easier to work with than vectors.

Question Info

Course: PHY 101
Topic: Work, Energy and Power
Type: Objective
Difficulty: Not specified
Question 371 of 1250
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