Question

1. An effort force of 20 N is used to lift a load of 60 N by a machine. Calculate the mechanical advantage of the machine.


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Answer 1

Answer:

To calculate the effort required to lift the load we divide the load by the number of ropes (do not count the rope that goes to the effort).

Explanation:

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Answer 2

Let us take first case,

in which load=20N,effort=5N,VR=20

Efficiency=

VR∗effort

load

∗100

Putting above values, we get

Efficiency=

20∗5

20

∗100=20%

In second case we have. load=30N,efoort=6N,VR=20

Efficiency=

VR∗effort

load

∗100

Putting values we get,

Efficiency=

20∗6

30

∗100=25%

HenceEfficiency=25%,20%