Frictional force refers to the force generated by two surfaces that contact and slide against each other. Friction is caused due to the irregularities on the two surfaces in contact. So, when one object moved over the other, these irregularities on the surface get entangled, giving rise to friction. The more the roughness, the more irregularities and more significant will be the friction.
- When the car is at rest, we must apply more force to get it moving, which has a greater value.
- As soon as the car begins to move, the friction changes to rolling friction, which is always lower than the previous one.
- As a result, we must use the least amount of force to keep it moving.