Q20 of 124 Page 55

Explain the meaning of the following equation:

P = m × v


Where symbol have their usual meaning

.P = mv, shows the method to calculate the momentum of an object. Where, p represents momentum

m, mass of object and v, velocity of the object.


It shows that the momentum of an object is the product of its mass and velocity.


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18

Fill in the following blanks with suitable words:

(a) …………… is a measure of the inertia of a body.


(b) When a running car stops suddenly, the passengers are jerked …………..


(c) When a stationary car starts suddenly, the passengers are jerked …………


(d) Newton’s first law of motion is also called Galileo’s law of …………..


(e) If there were no unbalanced force of …… and no ………..resistance, a moving bicycle would go on moving forever.

 19

Explain why, it is easier to stop a tennis ball than a cricket ball moving with the same speed.

 21

Explain how, a karate player can break a pile of tiles with a single blow of his hand.

 22

Calculate the momentum of a toy car of mass 200 g moving with a speed of 5 m/s.