1.26 Answers
1.26 Question
31 October 2011
17:36
· 1.26 understand that the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam
Question
· The Newtonmeters in the diagram labelled L and R are spaced 1m apart
· The hanging mass has a weight of 7N and is placed 0.3m from the Newtonmeter labelled R
· What are the readings on Newtonmeters L and R?
Hints to help
· Calculate moments about either of the Newtonmeters; moments should be balanced because the beam is stationary
· Now calculate moments about the other Newtonmeter
· You should now have found the readings on each Newtonmeter; is there a way to check that these answers are correct?
Fa x da = Fc x dc
7 x 0.3 = Fc x 1.0
2.1N= Fc
Fa x da = Fc x dc
7 x 0.7 = Fa x 1.0
4.9N = Fa
The reading on the Newton meter R will be 2.1N
The reading on Newton meter Lwill be 4.9N
