First slide

Torque

Question

A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distant from the hinges for opening or closing the door is:

Easy

A

1.2 N
B

3.6 N
C

2.4 N
D

4 N

Solution

$τ_{1} = τ_{2} \Rightarrow (1) (1 .6) = F (0 .4) \Rightarrow F = 4 N$

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