Question

A father and son pushed their car to bring it to the side of the road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.

Answer 1

Hint: To move the automobile (heavier item) from its rest position, we must use more force. The force of friction rises as the mass increases. When the automobile begins to move, the friction changes to rolling friction. Friction is reduced by rolling. As a result, the current force is smaller than the prior one. As a result, we simply need to apply the smaller effort to keep the automobile moving and balanced.

Complete answer:
The following are the five laws of friction:
-The friction between the moving item and the normal force is proportionate and perpendicular.
-The object's friction is determined by the type of the surface it comes into contact with.
-Friction exists regardless of the area of contact as long as there is one.
-Velocity has no effect on kinetic friction.
-The static friction coefficient is higher than the kinetic friction coefficient.

When we push anything against friction, we must add force in order to simply move the object; when we apply force, static friction occurs. It prevents the item from moving. When we raise the force, the static friction value increases as well, however at a certain point, the static friction cannot grow any more.

At this point, the object is about to move; when we apply more force, the object begins to move; as the motion begins, friction decreases slightly; eventually, it becomes constant, and we can apply a constant force to move the object; and finally, we can apply a constant force to move the object. To overcome static friction, we must apply a greater force to move an object.

Note: Friction is the force that prevents solid surfaces, fluid layers, and material components sliding against each other from moving in the same direction. Friction comes in a variety of forms: The force that opposes the relative lateral motion of two solid surfaces in contact is known as dry friction.