A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is

Answer: Frictional force

Explanation:

Since the body is moving at constant velocity, this means that the acceleration of the body is zero. Frictional force is a force of opposition which tends to oppose the moving force of an object on a flat surface.

Mathematically, summation of force on the car along the road will be

Fm - Ff = ma

Fm = moving force

Ff = frictional force

m = mass of the body

a = acceleration of the body

Since a = 0, we have;

Fm - Ff = 0

Fm = Ff (which shows that the two forces acting on the body are equal and opposite)

This frictional force will tend to keep the body at equilibrium.