# Activity 9.4 Class 9 Science Force and Laws of Motion

Activity 9.4 Class 9 Science Force and Laws of Motion Chapter 9

#### What activity asks?

Activity 9.4 asks us to stand on a cart and play the game of catching sandbags.

#### Observation:

While throwing the bag our body and the bag also moves but in the opposite direction of the bag.

#### Explanation:

For every reaction, there is an equal and opposite reaction. Here when we throw the bag, it exerts an opposite force on the body. As a result, the cart also starts moving but in the opposite direction. It was Newton, who first saw this effect. So, we call this as Newton’s third law of motion.

#### Inference:

For every action, there is an equal and opposite reaction.

##### Similar examples:

Recoiling of a gun after firing: You must have seen a jerking effect of a gun while firing. When bullet moves ahead it exerts an opposite and equal force on the gun. As a result, the gun recoils with great force as well. To overcome this effect, the gun is made heavy with a big base.

Force = m1a1 = m2a2

m1↓a1↑ = m2↑a2

Activity 9.4 Class 9 Science Force and Laws of Motion

Ref: Class 9 Science chapter 9.

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