Question detail

Forces and motion scenario: two trolleys collide and momentum is compared before and after. Which answer best addresses Newton's laws of motion and the objective to explain that an object at rest remains at rest 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 collision scenario, apply resultant force to explain that an object at rest remains at rest when resultant force is zero while keeping resultant force versus balanced forces separate.
B. In the collision scenario, mix up resultant force versus balanced forces 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 at rest remains at rest when resultant force is zero.

Answer

The correct answer is: In the collision scenario, apply resultant force to explain that an object at rest remains at rest when resultant force is zero while keeping resultant force versus balanced forces separate.

Explanation

The correct option is In the collision scenario, apply resultant force to explain that an object at rest remains at rest when resultant force is zero while keeping resultant force versus balanced forces separate.. It is correct because the scenario says two trolleys collide and momentum is compared before and after, which must be interpreted through Newton's laws of motion. This directly supports the learning objective to explain that an object at rest remains at rest when resultant force is zero. Use values 7, 9, and 17 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 resultant force versus balanced forces.

Common mistake

Confusion about Forces

Students often think that an object at rest will start moving if no forces are acting on it.

Remember that an object at rest remains at rest when the resultant force is zero. Reinforce the concept that it is the presence of a non-zero resultant force that causes motion.

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