Question detail

Forces and elasticity scenario: weight and normal contact force act on one object. Which answer best addresses Required practical: force and extension and the objective to use the straight-line section of a force-extension graph to identify proportional behaviour?

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 elasticity

Question

A. In the book on table scenario, apply force to use the straight-line section of a force-extension graph to identify proportional behaviour while keeping elastic versus plastic deformation separate.
B. In the book on table scenario, mix up elastic versus plastic deformation and ignore force.
C. Use a general revision statement without applying Required practical: force and extension to the situation.
D. Choose a different forces topic instead of explaining use the straight-line section of a force-extension graph to identify proportional behaviour.

Answer

The correct answer is: In the book on table scenario, apply force to use the straight-line section of a force-extension graph to identify proportional behaviour while keeping elastic versus plastic deformation separate.

Explanation

The correct option is In the book on table scenario, apply force to use the straight-line section of a force-extension graph to identify proportional behaviour while keeping elastic versus plastic deformation separate.. It is correct because the scenario says weight and normal contact force act on one object, which must be interpreted through Required practical: force and extension. This directly supports the learning objective to use the straight-line section of a force-extension graph to identify proportional behaviour. Use values 2, 7, 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 elastic versus plastic deformation.

Common mistake

Identifying Proportionality

Students often confuse the straight-line section of a force-extension graph with non-linear sections, leading to incorrect conclusions about proportional behaviour.

To fix this, students should focus on identifying the straight-line section clearly and understand that it indicates a direct proportionality between force and extension, ensuring they differentiate it from any curves present in the graph.

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