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# M1 help watch

1. an object of mass 15 kg rests on a horizontal table. it is connected by a light inextensible string passing over a smooth pulley to a mass of 10 kg which hangs freely
a) draw a diagram - I have done this
b) assuming that the system is only just in equilibrium find the magnitude of the frictional force
c) assuming now that the frictional force is now insufficient to stop slipping, write down an equation of motion for each of the masses
really don't know how to do these
2. b) See what equation you can come up with for horizontal force equilibrium at the 15kg weight. Then get a vertical force equilibrium equation at the 10kg weight. Knowing that tension in the string is the same everywhere, merge these equations together and see what you find.
c) Good old F=ma. When anything moves you need to think of this equation!
3. (Original post by aerofanatic)
b) See what equation you can come up with for horizontal force equilibrium at the 15kg weight. Then get a vertical force equilibrium equation at the 10kg weight. Knowing that tension in the string is the same everywhere, merge these equations together and see what you find.
c) Good old F=ma. When anything moves you need to think of this equation!
iv tried coming up with equations for b, but still not sure

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Updated: October 8, 2017
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