State whether the following statements are True or False.(a) A boy doe

1.	State whether the following statements are True or False.(a) A boy does work while pushing a wall.(b) A machine performs work by itself.(c) In an ideal machine, work done on load is equal to the work done by effort.(d) All levers are force multipliers.(e) A pulley changes the direction of force.(f) An inclined plane always has the mechanical advantage more than 1.
Answer» 1. False 2. False 3. True 4. False 5. True 6. True

State whether the following statements are True or False.(a) A boy does work while pushing a wall.(b) A machine performs work by itself.(c) In an ideal machine, work done on load is equal to the work done by effort.(d) All levers are force multipliers.(e) A pulley changes the direction of force.(f) An inclined plane always has the mechanical advantage more than 1.

Answer»

1. False

2. False

3. True

4. False

5. True

6. True

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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.
How does a pulley make work simpler ? Differentiate between a single fixed pulley and a single movable pulley.
Fill in the blanks :(1) Simple machines can be handled ………….. .(2) The structure of complex machine is …………..(3) The more gradual the the ………….. lesser is the we bear. But, such an inclined plane is ………….. .(4) The steeper the ………….. , the ………….. is the inclined plane. But we have to bear a …………. weight.(5) A screw is like a rolled up inclined plane made of an ………….. strip.(6) A wedge is used for ………… an object into two pieces or to ………….. the objects stuck together.(7) A farmer uses a strong …………. to remove the big stone bogged down in the farm.(8) A device with a grooved wheel and thread designed to lift weights is called a …………. .(9) When we use a pulley, force is applied in the downward direction for lifting the weight in an …………. direction.(10) Combination of an axle and a wheel is a …………. machine.(11) A needle and a nail are also kind of …………. .(12) Machines are covered when not in use to prevent …………. settling on them.(13) In Archimedes’ screw, the pipe was placed at an angle of …………. with one end inside the …………. and the rod resting on a …………. .
What is an inclined plane?
Observe the machines shown in the following pictures. For what purposes are they used? Can you name some other machines of this kind?
List properties of complex machines.
Define mechanical advantage (M.A.) and velocity ratio (V.R.) of machine.
Give three examples for leavers of IInd order.
Machines are able to make our work convenient.
Name a machine which can be used to multiply force and change the direction of force applied.

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