Question

GRAVESANDS APPARATUS experiment..exp pls​

Answer 1

Explanation:

Gravesand's apparatus which is a parallelogram law of forces apparatus. Plumb line. Two hangers with slotted weights. A body whose weight is to be determined. Thin strong thread.

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Answer 2

Aim :

To find the weight of a given body using parallelogram law of vectors.

Apparatus :

Parallelogram law of forces apparatus (Gravesand’s apparatus), plumb line, two hangers with slotted weights, a body (a wooden block) whose weight is to be determined, thin strong or thread, white drawing paper sheet, drawing pins, mirror strip, sharp pencil, half metre scale, set squares, protractor.

Theory :

in the Attachment..

Procedure :

• The weights P, Q and wooden block S act as three forces.

• to-find-the-weight-of-a-given-body-using-parallelogram-law-of-vectors-6.

• acting along the three threads at the junction O. The forces are in equilibrium.

• See that all the weights hang freely and none of them touches the board or the table.

• Mark the position of junction O on the white paper sheet by a sharp pencil.

• Disturb weights P and Q and leave them.

• Note position of junction O. It must be very close to earlier position. (If not, oil the pulleys to remove friction.)

• Keeping mirror strip lengthwise under each thread, mark the position of the ends of the image of thread in the mirror, covering the image by the thread (this removes parallax error). The position are P1 ,P2 for thread of weight P, Q1 and Q2 for thread of weight Q and S1 , S2 for thread of weight S as shown in figure.

• Remove paper from the board.

• With the help of a half metre scale draw lines through points P1 and P2 to represent P, through points Q1 and Q2 to represent Q and through points S1 and S2 to represent S. These lines must meet at point O.

• Taking a scale, 1 cm = 50 g, take OA = 3 cm and OB = 3 cm to represent P = 150 g and Q = 150 g.

• Complete parallelogram OACB using set squares and join OC. It represents R.

• Measure OC. It comes to be 3.9 cm.

• For different sets of observation, change P and Q suitably.

• Find weight of the wooden block by a spring balance.

Observation :

• Least count of spring balance=... g

• Zero error of spring balance =...g

• Weight of unknown body by spring balance =...g

• Scale. Let 1 cm = 50 g.

Calculations :

to find the weight of a given body using parallelogram law of vectors 5

Result :

1. The unknown weight of given body = 195 g
2. The error is within limits of experiment error.

Sources of error :

∆ Pulleys may have friction.

∆ Weights may not be accurate.

∆ Points may not be marked correctly.

∆ Weight measured by spring balance may not be much accurate.

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