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.

Options

A. 5, second
B. 0.25, first
C. 2.5, third
D. 0.243 third

Answer

D

Explanation

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