Question

After applying breaks to stop at a stop sign, a 1000 kg car (C) skids (wheels are locked) along the straight flat road (R) for a halt. The car was initially traveling at 15 m/s and it was brought to a complete stop within 3 seconds. Assume, no air resistance.
i. Using a force diagram and the definition of the work done, identify if each force does positive, negative, or zero work on the system of the “car and the passengers”.
ii. Apply work-energy principle to determine the total work done by external forces in stopping the car.
iii. What force is responsible for this work?

Answer 1

The solution is given below.

Thank you.