Question detail

Forces and motion scenario: two trolleys collide and momentum is compared before and after. Which answer best addresses Distance-time graphs and the objective to calculate speed from the gradient of a distance-time graph?

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 distance-time graph to calculate speed from the gradient of a distance-time graph while keeping distance versus displacement separate.
B. In the collision scenario, mix up distance versus displacement and ignore distance-time graph.
C. Use a general revision statement without applying Distance-time graphs to the situation.
D. Choose a different forces topic instead of explaining calculate speed from the gradient of a distance-time graph.

Answer

The correct answer is: In the collision scenario, apply distance-time graph to calculate speed from the gradient of a distance-time graph while keeping distance versus displacement separate.

Explanation

The correct option is In the collision scenario, apply distance-time graph to calculate speed from the gradient of a distance-time graph while keeping distance versus displacement separate.. It is correct because the scenario says two trolleys collide and momentum is compared before and after, which must be interpreted through Distance-time graphs. This directly supports the learning objective to calculate speed from the gradient of a distance-time graph. Use values 2, 11, and 20 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 distance versus displacement.

Common mistake

Gradient Misinterpretation

Students often confuse the gradient of a distance-time graph with the total distance travelled instead of recognizing it as speed.

Emphasize that the gradient represents speed, which is the rate of change of distance over time. Practice calculating speed using the formula: speed = distance/time.

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