Question

a) Efficiency of a lever is always less than hundred percent.
b) The blades of a metal cutter are shorter than that of blades
of paper cutter scissor.
c) It will be easier to lift a load in wheel barrow if the load is moved
towards the wheel.
4) Give two differences between mechanical advantage and velocity ratio.
5) The mechanical advantage of a lever is 4. What does it mean?
6) Two men are trying to carry a wooden pole. If one of them is weaker
than other, how can they carry the pole hence making small load for
the weak man?
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Ex Ed
7) Solve the following numerical problems.
a) A load of 400N is lifted up by an effort of 100N. If load distance is
20cm, what will be the effort distance? (Ans : 80cm)
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b) Two boys, Shrijan having weight 600N and Shrijesh having weight
300N are playing see-saw. If Shrijan is sitting at 2m from fulcrum,
where should Shrijesh sit from fulcrum to balance Shrijan? (Ans: 4m)
c) A lever of length 1m has been used to lift a load of 600N by applying
FOOon If Inodic at 20cm from fulcrum, calculate mechanical​

Answer 1

Answer:

google mar la

Explanation:

Answer 2

Answer:

efficiency of a lever is always less than hundred percent