1. A young woman on a skateboard is pulled by a rope attached to a bicycle. The
ID: 2038157 • Letter: 1
Question
1. A young woman on a skateboard is pulled by a rope attached to a bicycle. The velocity of the skateboarder is e = (4.10 m/s,0) and the force exerted on her by the rope if (17.0, 12,0)N (I) (10 points) Find the work done on the skateboarded by the ro e in 25.0 nts) Assuming the velocity of the bike is the same as that of the skate- boarder, find the work the rope does on the bicycle in 25.0s. (III) (10 points) Assuming the velocity of the skateboarder is constant, and that they drive on a flat terrain (no hills), what is the magnitude of the kinetic friction force orn the skateboarder? (Assume gravity, normal force, friction force -static and kinetic- and the rope are the only forces acting on the skateboarder)Explanation / Answer
(I) Work done=Force*displacement in direction of force
displacement is only in x direction
in 25 s ,displacement =4.1*25=102.5 m
work done=102.5*17=1742.5 J
(II)Work done =-1742.5 J
(III)If velocity is constant ,net force in x direction=0 ,so
frictional force =17N (in -x )
frictional force=(-17.0,0.0)
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