Question detail
A car traveling at a speed of 20 m/s needs to stop. If the braking force is 4000 N, calculate the work done by the brakes to bring the car to a stop. Include the formula used in your calculation Explain your answer using Energy transfer and braking and stopping.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Work done and energy transfer
Question
A car traveling at a speed of 20 m/s needs to stop. If the braking force is 4000 N, calculate the work done by the brakes to bring the car to a stop. Include the formula used in your calculation Explain your answer using Energy transfer and braking and stopping.
Answer
The work done by the brakes is 80000 J.
Explanation
A strong answer should address use work done ideas to explain safety features that increase stopping time or distance directly. Use the context of Energy transfer and braking within Work done and energy transfer, then state the relevant forces or motion reasoning with units where needed. The answer is correct when it names the key physics quantity, keeps distance and displacement distinct, and links the conclusion back to the approved learning objective.
Common mistake
Confusing Work Done with Force
Students often confuse the concept of work done with the force applied, thinking that work done is simply the amount of force exerted.
To fix this, remember that work done is the energy transferred when a force moves an object through a distance. Use the formula W = F x s to calculate work done, where W is work done, F is force, and s is the distance moved in the direction of the force.
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