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Hari is studying in 6th standard and is ...

Hari is studying in 6th standard and is interested in science related experiments. While reading simple machines topic from his text book,he started wondering as to which lever a pen belongs to in its writing position? The length of the pen he is using is 14 cm and he holds it at distance of 4 cm from its nib. If the force applied by Hari to write is 0.02 N, the mechanical advantage of the pen is _____ and it is acting as a _____order lever.

A

5, second

B

0.25, first

C

2.5, third

D

0.243, third

Text Solution

Verified by Experts

The correct Answer is:
D
A pen acts as a third order lever in writing position (since the effort is applied at the middle of the fulcrum and the load).
The length of pen=load arm=14 cm
Effort arm 10=cm
Mechanical advantage of pen `=("effort arm")/("loada arm")`
`=(10)/(14)=0.243`
Hence, the correct option is (d).
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