Physics 211 Spring 2009 Syracuse University Homework Problem Set 7 p.1
Physics 211 Problem Set 7 Due Wed, 03/4/09
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1. A block of mass 5.0 kg is moving down a frictionless incline that makes an angle of
30o with the horizontal. While the block is moving a distance of 2 m, a rope exerts a
constant force of 15 N upward along the ramp. Throughout the problem use g=10
m/s2.
(a) Draw all forces on the block.
(b) Draw a vector to represent the net force on the block (label it clearly) and
determine its magnitude.
(c) Is the block speeding up or slowing down? Explain.
(d) Find the work done by the net force ( netnet
WFs
=•∆
r
r
)
∆
s=2 m
m
30
o
rope
