Application of Third Law of Motion

Q. Since action and reaction forces are always equal and opposite, how can motion then take place? (4 marks)

Q.

A boy hits a football with a large force, the action force acts on the football and same magnitude reaction force acts on the boy. What can be inferred by above statement?

1. Action force and reaction force are equal to each other

2. Action and reaction forces acts on two different bodies

3. Action and reaction force does not cancel each other

4. All of the above

Q.

Among these two scenarios, identify the action force and reaction force.

Scenario 1$:$ A person is pushing a book on the table.

Scenario 2$:$ A gun is fired

Then match the following.

$$\begin{array}{cc}coloumn-A& coloumn-B\\ 1.Actionforce& a)forceappliedbythebookontheboy\\ 2.Reactionforce& b)forceappliedbytheboyonthebook\\ & c)recoilforceonthegun\\ & d)acceleratingforceonthebullet\end{array}$$

1. 1-a and c , 2-b and d

2. 1-a and 2-b, c and d

3. 1-b and 2-a, c and d

4. 1-b and d, 2-a and C

Q. When a horse pulls a cart, the force that helps the cart move forward is the force exerted by :

1. The cart on the horse
2. The ground on the horse
3. The ground on the cart
4. The horse on the ground

Q. A man drawing a bucket of water falls back when the rope snaps. This is because of

1. $2^{nd}$ law of motion
2. $3^{rd}$ law of motion
3. Law of gravitation
4. $1^{st}$ law of motion
   

Q. A boy is standing in a lift. The force on the floor of the lift due to the weight of the boy becomes zero:

1. When the lift is not moving
2. None of these
3. When the lift moves down with an acceleration of $9.8m{s}^{-2}$
4. When the lift moves down with an acceleration $9.8m{s}^{-2}$

Q. A person is walking on the road. Which of the following observation(s) is/are correct with respect to Newton's third law of motion?

1. The person is pushing the ground forward.
2. The ground is pushing the person backward.
3. The person is pushing the ground backward.
4. The ground is pushing the person forward.

Q. In a horse cart problem, the horse and cart applies equal and opposite force on each other and hence the cart will never move.

1. True
2. False

Q. Newton's third law states that every action has an equal and opposite reaction, and the forces act on two different bodies.

1. True
2. False

Q. Pick the cases where Newton's third law of motion is involved.

1. Swimming in a pool
2. Dusting a carpet
3. A space shuttle being launched
4. Recoil of a gun while firing