Q26 of 124 Page 55

Which of the two, balanced forces or unbalanced forces, can change the shape of an object? Give an example to illustrate your answer.

Balanced forces can change the shape of the object.

Example: Squeeze a rubber ball between the palms of your hands. What do you observe? The shape of the rubber ball changes. The force applied on the ball is equal and opposite, so, the resultant of this force does not move the object, this is balanced force.


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24

A body of mass 25 kg has a momentum of 125 kg. m/s. Calculate the velocity of the body.

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Calculate the momentum of the following:

(a) an elephant of mass 2000 kg moving at 5 m/s


(b) a bullet of mass 0.02 kg moving at 400 m/s

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Describe the term ‘inertia’ with respect to motion.

 28

State Newton’s first law of motion. Give two examples to illustrate Newton’s first law of motion.