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A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 3.8m and is 7.8m long. using energy...Asked by Lindsey
A 25 kg child slides down a playground slide at a constant speed. The slide has a height of 3.0 m and is 7.0 m long. Using energy considerations, find the magnitude of the kinetic friction force acting on the child.
Answers
Answered by
drwls
Since the kinetic energy does not change,
Friction work = (Friction force)*(sliding distance) = Potential energy loss
M g*3.0 m = Ff*7.0 m
Ff = (3/7) M g = 105 J
is the friction force that resists motion.
Friction work = (Friction force)*(sliding distance) = Potential energy loss
M g*3.0 m = Ff*7.0 m
Ff = (3/7) M g = 105 J
is the friction force that resists motion.
Answered by
mr. marr
thank you, will teach the class this tomorrow (I didnt know how to do it myself)
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