Newton’s Third Law explains how forces work in pairs. It says that whenever you push or pull on something, that object pushes or pulls back with the same force in the opposite direction. This is called action and reaction. This law helps us understand how things move and interact in the world.
- Action and Reaction Forces: For every force you apply, there is an equal opposite force.
- Examples: When you sit on a chair, your body pushes down, and the chair pushes up.
- Everyday Impact: It helps explain flying birds, shooting guns, and jumping off boats!
Newton’s Third Law: Action, Reaction Forces Explained.
Related MCQ’S
1. What does Newton’s Third Law of Motion state?
A) Every force is stronger than the reaction force.
B) For every action, there is an equal and opposite reaction.
C) Objects move only when acted upon by a force.
D) A force always causes an object to speed up.
Answer: B) For every action, there is an equal and opposite reaction.
Explanation: This law says that if one object pushes or pulls on another, the second object pushes or pulls back with the same force in the opposite direction.
2. What happens when you sit on a chair?
A) The chair pulls you down.
B) Your body pushes down on the chair, and the chair pushes up.
C) You fall through the chair.
D) The chair stays still without any force.
Answer: B) Your body pushes down on the chair, and the chair pushes up.
Explanation: This is an example of Newton’s Third Law, where your body’s force on the chair is matched by the chair’s force back on you.
3. What is the reaction force when a bird flaps its wings?
A) The bird moves downward.
B) The air moves downward.
C) The bird moves up.
D) The air pushes up on the bird.
Answer: D) The air pushes up on the bird.
Explanation: When a bird pushes air downward (action), the air pushes back upward on the bird (reaction), which helps lift it off the ground.
4. Why does a gun recoil less than a bullet when fired?
A) The bullet is lighter than the gun.
B) The gun has more mass than the bullet.
C) The gun is faster than the bullet.
D) The bullet doesn’t move.
Answer: B) The gun has more mass than the bullet.
Explanation: According to Newton’s Second Law, the gun’s greater mass causes it to recoil less than the bullet, which is lighter.
5. What happens when you push a small boat off the shore?
A) The boat pushes you forward.
B) You stay still, and the boat moves.
C) You move forward, and the boat moves backward.
D) Neither you nor the boat moves.
Answer: C) You move forward, and the boat moves backward.
Explanation: When you push off the boat (action), the boat pushes back, moving you forward and itself backward.
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