Newton's Third law of Motion

# Procedure for doing real Lab:

1. Take two similar spring balances of different ranges, say A and B.
2. Note the least count of the spring balances.
3. 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.
4. Hold the spring balances exactly horizontal to the table.
5.  Pull the ring of spring balance B gently.
6. Observe and note the reading of both the spring balances.Repeat the experiment by applying different forces.

# Procedure for doing simulator:

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

# Observations:

1. Least count of the spring balance = value of 1 small division
2. Least count of the spring balance A=………N
3. Least count of the spring balance B =…………………N

 No. of observations Reading of  B (Second spring balance) when force applied (N) Reading of  A (First spring balance) when force applied (N) Difference in reading of A and 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.

# Precautions:

1. Spring balance of different least count should be taken.
2. The spring balance should be brought in elastic mode before doing the experiment.
3. The second spring balance should not be pulled beyond its elastic limit.
4. The reading of the spring balance should be taken without any parallax error.

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