1 (a) The work done to bring a car to rest is given by the equation
work done = braking force × braking distance
Which of these graphs is correct for the car if a constant braking force is applied?
(1)
(b) Before the car brakes it has kinetic energy - Edexcel - GCSE Physics - Question 1 - 2019 - Paper 1
Question 1
1 (a) The work done to bring a car to rest is given by the equation
work done = braking force × braking distance
Which of these graphs is correct for the car if a co... show full transcript
Worked Solution & Example Answer:1 (a) The work done to bring a car to rest is given by the equation
work done = braking force × braking distance
Which of these graphs is correct for the car if a constant braking force is applied?
(1)
(b) Before the car brakes it has kinetic energy - Edexcel - GCSE Physics - Question 1 - 2019 - Paper 1
Step 1
Identify the correct graph for a constant braking force
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Answer
The correct graph is C. For a constant braking force, the work done is directly proportional to the braking distance. As the distance increases, the work done to bring the car to rest also increases linearly.
Step 2
State what happens to the kinetic energy during braking
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Answer
During braking, the kinetic energy of the car decreases. This is because the work done against the forces of motion by the braking force converts the kinetic energy into other forms of energy, primarily heat due to friction.
