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First Law of Motion

Give qualitat...

Question

Give qualitative definition of force on the basis of Newton's first law of motion.

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Solution

The qualitative definition of force on the basis of Newton's first law of motion is as follows:
"Force is that external cause which can move a stationary object or which can change the state of motion of a moving object."

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Q. The law that gives a qualitative definition of force is :

Q. (a) Newton's first law of motion gives a qualitative definition of force. Justify.
(b) Which would require a greater force for accelerating - a

2 k g

4 {m s}^{- 2}

3 k g

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Q. i) Newton's first law of motion gives a qualitative definition of force. Justify.
ii) The figure represents two bodies of masses

10 k g

15 k g

, moving with an initial velocity of

10 m s^{- 1}

5 m s^{- 1}

respectively. They collide with each other. After collision, they move with velocities

4 m s^{- 1}

9 m s^{- 1}

respectively. The time of collision is

2 s

.
Now calculate

F_{1}

F_{2}

Q. Match list (I) with List (II)

List I	List II
a) Recoil of gun	e) Newtons first law
b) Acceleration in one dimension and motion in two dimensions	f) Newtons second law
c) Definition of force	g) Projectile motion
d) Measurement of force	h) Newton’s third law

Q. The first law of thermodynamics
1. is a re-statement of the law of conservation of energy when applied to thermodynamic systems.
2. is the basis for the definition of internal energy.
3. is basis for the definition of temperature.

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