Concepts Of Physics MCQ Edition [Volume 1]PhysicsNewton's Laws of Motion

When a car accelerates along a horizontal road, the force responsible for the acceleration is exerted by

Options

Athe car's engine
Bthe car's driver
Cthe earth
Dthe road

Correct answer

D. the road

Step-by-step solution

When a car accelerates, the engine provides torque to the wheels, causing them to rotate. As the wheels rotate, they push backward against the road due to friction. According to Newton's third law of motion, the road exerts an equal and opposite forward frictional force on the tires. Since internal forces cannot accelerate the center of mass of the system, this external frictional force exerted by the road is responsible for the acceleration of the car.

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