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16-force and motion 3

# 16-force and motion 3 - PHYS 211 Force and Motion Newtons...

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PHYS 211 2/20/09 Force and Motion Newton’s Laws

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Climbing a Rope When you climb up a rope, the first thing you do is pull down on the rope. How do you manage to go up the rope by doing that? 1) this slows your initial velocity which is already upward 2) you don’t go up, the rope goes down 3) you’re not really pulling down – it just seems that way 4) the rope actually pulls you up 5) you are pulling the ceiling down
Problem Solving Strategy Sketch the picture Create a free body diagram - with appropriate axes Identify the system under consideration Apply Newton’s laws to each direction separately

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Contact Force A force of magnitude F pushes block A of mass 2m , which in turn pushes block B of mass m as shown. The blocks are accelerated across a horizontal, frictionless surface. What is the magnitude of the force that the smaller block exerts on the larger block ? A B F net = (2 m + m ) a F = 3 ma F 3 m = a System A+B F BA = ma = m F 3 m = F 3 F AB = F BA Block B a) F /3 b) F /2 c) F d) 2 F e) 3 F B F BA
Pulley Example The figure shows a block of mass M=3.3 kg free to slide on a horizontal frictionless surface.

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