EXPERIMENT – 9

AIM:

To find the effort required to roll a roller up an inclined plane and to determine its MA and VR for different angles of inclination.

APPARATUS: 

An inclined plane, roller,weight box, pan, protractor and spring balance.

THEORY:

An inclined plane is a simple machine whose

 MA = Load/ Effort = L/E and 

VR= l/h where l= length of inclined plane and h= height of inclined plane.

PROCEDURE:

1. Fix the angle of inclination  of the inclined plane and note the values of l and h.

2. Note the weight of the roller with the help a spring balance and let it be L.

3. Tie the end of the string with the hook of the roller and pass it over the pulley. Tie the other end to the pan.

4. Note the weight of the empty pan. Let it be 'w'.

5. Add weights to the pan gradually till the roller just begins to slide. Let the total weights be  'W'. Hence the effort required is 'W+w'.

6. Repeat the experiment for different angles of inclination.

7. Calculate the MA and VR for each set.

PRECAUTIONS:

1. Clean and polish the surface of the inclined plane to minimise the friction.

2. Pulley should be oiled.

3. Pan should not touch the table or the inclined plane.

4. Increase the weight of the pan gradually.

5. The inclined plane should be knocked gently each time.

RESULT:

It is found that for each angle of inclination, MA < VR as the friction between the roller and the inclined plane increases the effort required.