Asked by Terry
A mass of 60kg is on the edge of a plank. The Plank is 25 m long. There is a wedge 10 m from the 60 kg. Where would you position a 40kg so the plank would not rotate? If you placed the 40 kg at the end, where would you put a 10 kg mass to keep it balanced?
Answers
Answered by
ajayb
The moments of the gravitational forces should balance each other to prevent plank's rotation(about the wedge).
a)Taking moments about the wedge position:
40g*X = 60g*10
X = 15m from the wedge
b) You can't balance with a 10Kg mass.
40g*10 = 10g*X
X= 40m - beyond the length of the plank!
a)Taking moments about the wedge position:
40g*X = 60g*10
X = 15m from the wedge
b) You can't balance with a 10Kg mass.
40g*10 = 10g*X
X= 40m - beyond the length of the plank!
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