Application of Third Law of Motion

Q.

If action is always equal to the reaction, explain how a horse can pull a cart.

Q.

If action and reaction are equal and opposite, then how can the motion take place?

1. It is because action and reaction forces do not act simultaneously on same body.

2. It is because action and reaction forces act simultaneously on different bodies.

3. Motion takes place as it has nothing to do with action and reaction forces.

4. It is because action and reaction forces act on same body.

Q.

The action and reaction when a person is walking on the floor are

1. No action and reaction

2. Action- force to push the ground backward, Reaction- Force by ground on our feet backward

3. Action- force to push the ground forward, Reaction- Force by ground on our feet forward

4. Action- force to push the ground backward, Reaction- Force by ground on our feet forward

Q.

An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction force is the:

1. Grip of the archer''s hand on the bow.

2. Arrow pushing against bow string.

3. Weight of the arrow.

4. Air resistance against the bow.

Q. Every action has an equal and opposite reaction , then why don't the action and reaction forces cancel each other? Please give some examples too.

Q.

Even though the magnitude of action force and reaction force are equal and thier directions are opposite, thier effects do not get cancelled.Why?

Q.

A__________between two objects causes force.

Q.

Which is incorrect statement about action and reaction forces:

1. They act on different objects

2. They are opposite

3. They act on same object

4. They are equal

Q. Write two Properties of action and reaction force

Q.

While flying, birds push the air downwards with their wings. Give reasons.

Q. A pair of action and reaction forces always have ________ magnitude and _________ direction.

1. unequal, opposite
2. equal, same
3. unequal, opposite
4. equal, opposite

Q.

A child on a cart with wheels throws a sandbag forward. As a result:

1. He moves to the right

2. He moves forward

3. He moves backward.

4. He moves to the left.

Q. According to Newton's third law action is equal to reaction
so, why horse is able to pull a cart?

Q.

When a sailor jumps out of a boat in forward direction, the boat moves backward. Explain the reason for this observation and state Newtons law governing this observation.

Q.

As action and reaction forces are equal and opposite why do not they cancel each other

Q.

Which of these is false?

1. Action and reaction act simultaneously

2. Action and reaction act in opposite directions

3. Action and reaction forces cancel each other

4. None of the above

Q.

Why is the foot of a man injured when he hits a stone?

Q.

Action-reaction forces act:

1. In the same direction.

2. On two different bodies

3. On the same body

4. Along different lines.

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.

Based on the above condition, match the following.

$\begin{array}{cc}\text{Coloumn-A}& \text{Coloumn-B}\\ \text{1. Action force}& \text{a) force applied by the book on the boy}\\ \text{2. Reaction force}& \text{b) force applied by the boy on the book}\\ & \text{c) Recoil force on the gun}\\ & \text{d) Accelerating force on the bullet}\end{array}$

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.

Which of the following is NOT an example of action reaction pair?

1. (a) To walk, we push the ground in the backward direction by feet

2. (b) When a bullet is fired from a gun, the gun recoils

3. (c) A rocket engine moves up by ejecting gases downwards

4. (d) A book kept on a table is acted upon by two forces, the force exerted by earth (gravitational force) due to weight of the book and the normal force, applied by the table

Q. Why does a fire man struggle to hold a hose pipe

Q. Question 1
If action is always equal to the reaction, explain how a horse can pull a cart.

Q.

When you slap someone, thinking physics wise, you shouldn't feel sorry . Can you think why?

Q.

State the purpose of Newton`s third law of motion?

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.

Action and reaction forces are equal and opposite but they do not cancel each other. Why?

Q.

“Action and reaction are equal and opposite so they cancel each other.” Is it a correct statement?

Q.

If a man jumps out of the boat in the forward direction, the boat will move:

1. In the forward direction.

2. The boat will not move at all

3. Can move either ways

4. In the backward direction

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

Q. Do action and reaction forces act simultaneously? Explain.