[3 Marks Question]

Question 13 Marks

Write about the experiment to find the centre of gravity of the irregularly shaped plate.

Answer

1. Make three holes in the lamina
2. Suspend the lamina from the optical pin through one of the holes

3. Suspend the plumb line from the pin and mark the position of the plumb line on the lamina’
4. Draw lines on the lamina representing the positions of the plumb line.
5. Repeat the above steps for the holes.
6. Label the intersection of the three lines as X, the position of the center of gravity of the lamina.

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Question 23 Marks

Distinguish between speed and velocity.

Answer

Sr. No.	Speed	Velocity
1.	Speed is the distance travelled by an object in unit time.	Velocity is the distance travlled by an object in unit time in a given direction.
2.	Speed of a moving body can never be zero.	Velocity of a moving body will be zeo, is it returns to its original position. (i.e) when its displacement is zero.
3.	It is a scalar quantity	It is a vector quantity
4.	Speed $=\frac{\text { Distance travalled }}{\text { time taken }}$	Velocity $=\frac{\text { Displacement }}{\text { time taken }}$

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