Question

to verify the third law of motion using two spring balances

Answer 1

Procedure for doing real Lab:

Take two similar spring balances of different ranges, say A and B.Note the least count of the spring balances.Attach the ring of spring balance A on a hook fixed in the wall and the spring balance B is attached to the hook of spring balance A.Hold the spring balances exactly horizontal to the table. Pull the ring of spring balance B gently.Observe and note the reading of both the spring balances.Repeat the experiment by applying different forces.

Procedure for doing simulator:

Change the ‘Applied force’ slider and observe the reading on the two spring balances.Repeat the experiment by applying different forces.Click on the reset button for reset the experiment.

Observations:

Least count of the spring balance = value of 1 small divisionLeast count of the spring balance A=………NLeast count of the spring balance B =…………………N

Result:

The readings on both the balances are the same in each case. Thus action and reaction forces are equal and opposite and act on two different bodies.

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Answer 2

Given:

Two spring balances A and B.

To find:

For every action, there is equal and opposite reaction.

Procedure:

1. Place spring balance A on the hook.

2. Place the spring balance B on the hook of spring balance A.

3. Check and note the reading of the spring balance A.

4. Place the weight on the hook of the spring balance B. Now, note the reading of spring balances A and B.

5. Now, remove the weight and note the reading of the spring balances A and B.

Observation:

The weight of the object placed in the hook is equal to the reading on the spring balances A and B.

Conclusion:

The weight of the object is the action and the reading of the spring balance is reaction. Thus, for every action, there is equal and opposite reaction.