Torque wrench

Classical Mechanics Level 1

The picture [A] above is a 20 20 cm wrench which can tighten a bolt with at least 50 50 N of force. If the length of the wrench is increased to 50 50 cm as in [B] above, what is minimum force required for it to tighten the same bolt as before? (The forces are acting vertical to the axis of the wrench in both cases.)

15 N 10 N 50 N 20 N

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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3 solutions

Let the force in second case be F'. The formulas for such type of questions is

Force times length = Force' times length'

50 x 20 = F' x 50

F' = 20N

Cheers...

1 Helpful 0 Interesting 0 Brilliant 0 Confused

ok

M.Zahid Saeed - 7 years, 3 months ago
Asif Iqbal
Mar 10, 2014

20 N

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Zameel Khan
Feb 28, 2014

because, moment(m)=force distancce, m=50 20=100 from the conservation of moment, 100=f*50, F=20n

0 Helpful 0 Interesting 0 Brilliant 0 Confused

ok

M.Zahid Saeed - 7 years, 3 months ago

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