Question

The force which needs to be overcome at the instant an object starts moving from rest is?

Answer 1

1. When one body comes into contact with another, a resisting force known as a frictional force acts.
2. When motion does not begin, the friction acting is referred to as static friction; once motion begins, the resisting force acting slightly decreases [referred to as dynamic friction force].
3. Hence, the force required to be overcome to start a motion is the static frictional force.

Thus, the force which needs to be overcomed at the instant an object starts moving from rest is the static frictional force.