Question

Question 54:
A car is moving on a level road. If the driver turns off the engine of the car, the car’s speed decreases gradually and ultimately it comes to a stop. A student says that two forces act on the car which bring it to a stop. What could these forces be ? Which of these two forces contributes more to slow down and stop the car ?

Lakhmir Singh Physics Class 9

Answer 1

Answer:

The two forces are Friction by the road and Resistance from the air. Out of these two frictional force has a higher contrubution towards stopping the moving vehicle

Answer 2

Answer:

Friction force and air resistance

Explanation:

Friction force and air resistance are the two forces acting on the vehicle.

Thus, the frictional force adds more to slowing down and stopping the vehicle. These forces would be the friction of the air and the friction between the tires and the highway or the road that would bring the vehicle to rest. Frictional force would contribute more towards stopping the vehicle.