Question detail

Forces and motion scenario: a gear changes turning effect and rotation speed. Which answer best addresses Newton's laws of motion and the objective to explain that an object moving at constant velocity continues at constant velocity when resultant force is zero?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Forces and motion

Question

A. In the gear system scenario, apply resultant force to explain that an object moving at constant velocity continues at constant velocity when resultant force is zero while keeping speed versus velocity separate.
B. In the gear system scenario, mix up speed versus velocity and ignore resultant force.
C. Use a general revision statement without applying Newton's laws of motion to the situation.
D. Choose a different forces topic instead of explaining explain that an object moving at constant velocity continues at constant velocity when resultant force is zero.

Answer

The correct answer is: In the gear system scenario, apply resultant force to explain that an object moving at constant velocity continues at constant velocity when resultant force is zero while keeping speed versus velocity separate.

Explanation

The correct option is In the gear system scenario, apply resultant force to explain that an object moving at constant velocity continues at constant velocity when resultant force is zero while keeping speed versus velocity separate.. It is correct because the scenario says a gear changes turning effect and rotation speed, which must be interpreted through Newton's laws of motion. This directly supports the learning objective to explain that an object moving at constant velocity continues at constant velocity when resultant force is zero. Use values 4, 13, and 21 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error speed versus velocity.

Common mistake

Misunderstanding Constant Velocity

Students often think that an object moving at constant velocity is accelerating when in fact it is not, leading to confusion about the role of resultant force.

Emphasize that constant velocity means both speed and direction are unchanged, and clarify that a zero resultant force indicates no acceleration.

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