Gravitational force is a contact force.

When we lift a weight in our hands, the force required is provided by the tension of our muscles.

A force on a moving object ______ to the direction of motion will slow it down.

A ball thrown up comes down because of the _____ force.

(Friction/Pressure) _____ always opposes the motion of objects.

The force of _____ comes into play when a body slides over another.

Give reason for the following statement.

Knives and piercing tools have very sharp edges.