Name the physical quantity which makes it easier to accelerate a small car than a large car.

Find the acceleration produced by a force of 5 N acting on a mass of 10 kg.

A girl weighing 25 kg stands on the floor. She exerts a downward force of 250 N on the floor. What force does the floor exert on her?

Fill in the following blanks with suitable words:

(a) To every action, there is an ………. and ……..reaction.

(b) Momentum is a ……..quantity. Its unit is …………….

(c) Newton’s second law of motion can be written as Force = mass × …………… or Force = …………….. or change of …………

(d) Forces in a Newton’s third law pair have equal …………… but act in opposite …………

(e) In collisions and explosions, the total ………… remains constant, provided that no external ………… acts.

Explain the meaning of the following equation:

F = m × a

Where symbols have their usual meaning.