EXPERIMENT – 7

AIM:

To find the centre of gravity of lamina cut in various shapes.

APPARATUS:

Lamina cut in various shapes (square, rectangle, circle, scalene triangle, irregular shape), nail and plumb-line.

PRINCIPLE:

The Center of Gravity of an object is that point where the entire weight of the object is supposed to act.

PROCEDURE:

Make 3 small holes near the edge of the first lamina.
Fix a nail on the soft-board.
Suspend the lamina from any hole such that it is free to oscillate.
Now suspend the plumbline from the nail, and when the plumbline is stationery draw a line on the lamina along the string of the plumb-line.
Repeat the experiment with the other holes to get 3 lines on the lamina.
The point of intersection of the 3 lines is the center of gravity.
Repeat the above steps for other shapes of lamina.

PRECAUTIONS:

Holes should be small so that not too much of the lamina is removed.
The lamina when suspend at a given point should be able to swing freely at that point.

RESULT:

The center of gravity of various shapes is found as shown in the figures.

NOTE FOR STUDENTS : THIS EXPERIMENT REQUIRES TWO PAGES. HENCE LEAVE AN EXTRA PAGE IF YOUR EXPERIMENT IS COMPLETED IN 1 PAGE.