Q2 of 46 Page 249

Newton’s first law of motion gives a qualitative definition of force. Justify.

Newton’s first law of motion states that objects tend to stay in their state of rest or state of motion. This property of an object is called inertia. So this law is often called the law of inertia. It gives us a qualitative idea about force as it tells us that force tends to change the state of motion of a body.


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1

Space Stations are used to study the effects of long-space flight on the human body. justify.

 1

is the mathematical form of Newton’s law of gravitation, G - gravitational constant, m1m2, are the masses of two bodies separated by a distance d, then give the statement of Newton’s law of gravitation.

 2

The figure represents two bodies of masses 10 kg and 15 kg, moving with an initial velocity of 10 ms-1 and 5 ms-1 respectively. They collide with each other. After collision, they move with velocities 4 ms-1 and 9 ms-1 respectively. The time of collision is 2 s. Now calculate F1 and F2

 3

A 5 N force acts on a 2.5 kg mass at rest, making it accelerate in a straight line.

(i) What is the acceleration of the mass?


(ii) How long will it take to move the mass through 20m?


(iii) Find its velocity after 3 seconds.