Question

what is fulcrum, try to give answer in hindi please ​

Answer 1

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Answer 2

Answer:

Question 1:

Classify the following as a lever, a pulley and an inclined plane :

A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.

ANSWER:

A wedge: An inclined plane

A needle: An inclined plane

A staircase: An inclined plane

A slide: An inclined plane

The wheel of a flagpole: A pulley

Nutcrackers: A lever

Scissors: A lever

An opener: A lever

An axe: An inclined plane

A crane: A pulley

A knife: An inclined plane

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Question 2:

Fill in the blanks using the proper word and complete the statements.

(a) The ....... in the centre, the .......... on one side and the ...... on the other side make a lever of the first order.

(b) The ..... in the centre, the ........ on one side and the ......... on the other side make a lever of the second order.

(c) The .......... in the centre, the ....... on one side and the........on the other side make a lever of the third order.

ANSWER:

(a) The fulcrum in the centre, the load on one side and the effort on the other side make a lever of the first order.

(b) The load in the centre, the fulcrum on one side and the effort on the other side make a lever of the second order.

(c) The effort in the centre, the load on one side and the fulcrum on the other side make a lever of the third order.

Page No 90:

Question 3:

Which machines will you use to do the following work? Write their types.

(a) To remove the lid of a tin.

(b) To lift bricks to the top of a tall building.

(c) To cut vegetables.

(d) To draw water from a well.

(e) To hold a papad for roasting it.

ANSWER:

(a) To remove the lid of a tin, we should use an opener which is a second order lever.

(b) To lift bricks to the top of a tall building, we should use a crane which is a pulley.

(c) To cut vegetables, we should use a knife which is a wedge.

(d) To draw water from a well, we should use a pulley system or wheel-axle.

(e) To hold a papad for roasting it, we should use a tong which is a third order lever