APPARATUS:
Two spring balance, two iron stand with Clamps, meter-rod, sharp wedge, weight box, thread
PROCEDURE:
Find the center of gravity (G) of the meter rod by balance it on a sharp wedge. Suspended the spring balance from the clamps of iron stand and find out zero-correction for balance. Keep the iron stand 60 to 70 cm apart and suspend the meter rod edge-wise by two loops of themes attached to the hooks of spring balance. Arrange the apparatus such that the loops are vertical, meter rod is horizontal and graduations on the meter rod and balance face the observer. Note the correct reading of the balance and add them to get the weight (W) of the meter-rod. Suspend a suitable weight (w) taken out from weight box at the center of gravity G with the help of another loop of thread. Adjust the meter rod horizontal and edgewise once again and nots the corrected reading of spring balance P and Q. Note the positions of the loops at A and B on the meter rod and work out the distances AG.BG and AB. Take P and Q as like parallel forces (acting upward)and verify the conditions of equilibrium for them by proving that:
Take P (acting upward) and R (acting upward) as unlike parallel forces and verify the conditions of equilibrium for them by proving that:
Observation and Calculation:
Positions of and center of gravity of meter-rod (G). =…cm
Zero correction for balance P =….. g dynes
Zero correction for balance Q =….g dynes
Weight of the meter- rod =W =….g dynes
PRECAITIONS:
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ZERO Corrections for the spring balance should be noted carefully.
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The balances and loops supporting the meter-rod should be vertical.
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The meter –rod should be held edgewise and horizontal.
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For correct reading, the loop should be parallel to the graduations of the meter-rod.
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Heavy weight should be suspended at the center of gravity.
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The pointers of the balances should be displaced slightly before noting their readings.
VIVA VOICE
Q.1 What are the like and unlike parallel forces.
Ans. Like parallel forces are those forces whose lines of action are parallel to each other and they point in the same direction. Unlike parallel forces are those forces whose lines of action are parallel to each but them point in opposite directions.
Q.2. When a body is said to in equilibrium?
Ans. A body is said to be in equilibrium when no resultant force acts upon it and it is either at rest or moving with uniform velocity i.e., the translational as well as rotational acceleration is zero.
