Question

If you push a heavy box which is rest ,you must exert some force to start its motion

Answer 1

Answer:

See below.

Explanation:

By Newton's Second Law of Motion,

An object continues to be in the state of rest or uniform motion until an external force acts on it.

For a box move, or accelerate, we need to apply force. This force has to be greater than the static friction.

Answer 2

Answer:

Explanation:

In order to move the heavy box, you need to overcome the friction force that acts against the force that you are exerting on the box when you push it.

We need to execert some force because to keep the object in motion.

Static Friction<Sliding Friction<Rolling Friction

So, by applying this formula we can say that we can apply less strength comparing to static position.