Question detail
Forces and elasticity scenario: two trolleys collide and momentum is compared before and after. Which answer best addresses Hooke's law and spring constant and the objective to calculate spring constant from force and extension?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Forces and elasticity
Question
- A. In the collision scenario, apply force to calculate spring constant from force and extension while keeping elastic versus plastic deformation separate.
- B. In the collision scenario, mix up elastic versus plastic deformation and ignore force.
- C. Use a general revision statement without applying Hooke's law and spring constant to the situation.
- D. Choose a different forces topic instead of explaining calculate spring constant from force and extension.
Answer
The correct answer is: In the collision scenario, apply force to calculate spring constant from force and extension while keeping elastic versus plastic deformation separate.
Explanation
The correct option is In the collision scenario, apply force to calculate spring constant from force and extension while keeping elastic versus plastic deformation separate.. It is correct because the scenario says two trolleys collide and momentum is compared before and after, which must be interpreted through Hooke's law and spring constant. This directly supports the learning objective to calculate spring constant from force and extension. Use values 6, 9, and 12 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
Common Mistake in Spring Constant Calculation
Students often confuse the units of spring constant, using N instead of N/m.
Remember that the spring constant is defined as the force per unit extension, so it must be expressed in newtons per metre (N/m).
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