Question

A car accelerates on a horizontal road due to the force exerted by
(A) The engine of the car
(B) The driver of the car
(C) The earth
(D) The road.

Answer 1

The rate of change of an object's velocity with respect to time is called acceleration in mechanics. Accelerations are measured in terms of vectors. The orientation of the net force applied on an item determines the orientation of its acceleration. Newton's Second Law describes the magnitude of an object's acceleration.

Complete step by step solution:
In physics, a force is any influence that, when unopposed, causes an object to change its velocity. A force can cause a mass item to change its velocity (which includes starting to move from a standstill), i.e. accelerate. Intuitively, force may be characterised as a push or a pull. A force is a vector quantity since it has both magnitude and direction. The SI unit of Newton is used to measure it (N). The letter F is used to signify force.
According to the third law, all forces between two things are equal in magnitude and opposite in direction: If one object A exerts a force ${F_A}$ on a second object B, B simultaneously exerts a force${F_B}$ on A, and the two forces are equal in size and opposite in direction: ${F_A}$ is the same as negative ${F_B}$.
When a person walks, Newton's third law is visible: the person pushes against the floor, and the floor pushes against the person.
Similarly, a car's tyres push on the road as the road pushes back on the tires—the tyres and the road both push against each other at the same time.
The automobile pushes the ground backwards, and the ground's reaction force in the forward direction acts on the car, according to Newton's third law of motion. These forces are dependent on friction; for example, a person or a car may be unable to generate the necessary action force to create the required reaction force.
Hence option D is correct.

Note:
The concept of conservation of momentum was derived from Newton's third law; nevertheless, conservation of momentum is the more basic principle, and it holds in circumstances when Newton's third rule appears to fail, such as when force fields as well as particles carry momentum, and in quantum mechanics.