Give an example where inertia of rest comes in focus.

Why do athletes run for a while before taking a long jump?

What are the S.I. and C.G.S units of force? Give a relationship between them.

What is the general name given to the force which do not produce motion in a body but only change its shape?

If the velocity of a body is doubled, how much should the mass be reduced so that the linear momentum remains the same? Explain.

Explain the principle on which rocket works.

Sparks fly off tangentially when a knife is rubbed on a hard rotating disc. How can you account for this.

In a tug of war, two teams are pulling the rope such that the ribbon of the rope is not moving. What is the magnitude of the resultant force on the rope? Explain.