Introduction:

Newton's third law of motion states that for every action, there is an equal and opposite reaction. It means that if an object A exerts a force on object B, then object B will also exert an equal and opposite force on object A.

Objective:

The objective of this experiment is to demonstrate the Newton's third law of motion using two spring balances.

Materials Required:

- Two spring balances
- A rigid rod
- A stand and clamp to hold the rod
- Weights

Procedure:

1. First, set up the stand and clamp to hold the rod.
2. Attach one spring balance to one end of the rod and the other spring balance to the other end of the rod.
3. Make sure that the rod is horizontal and the spring balances are hanging vertically.
4. Add weights to one of the spring balances until the spring is stretched.
5. Observe the reading on the spring balance and record it.
6. Now, add the same amount of weight to the other spring balance.
7. Observe the reading on the second spring balance and record it.
8. Compare the readings on both the spring balances.

Observations:

- The readings on both the spring balances are equal and opposite.

Explanation:

The experiment demonstrates the Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When one spring balance is stretched, it exerts a force on the rod in one direction, and the rod exerts an equal and opposite force on the second spring balance in the other direction. As a result, the second spring balance also gets stretched, and the readings on both the spring balances are equal and opposite.

Conclusion:

The experiment successfully demonstrates the Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. The experiment can be repeated with different weights to further verify the law.