A heavy football player and a small girl stand facing each other on the ice. The

Question

A heavy football player and a small girl stand facing each other on the ice. They put their hands together and push against each other so that they move apart Who exerts larger force?

A 4 kg block initially at rest is pulled to the right along a frictionless, horizontal surface by a constant horizontal force of 13 N. Find the block's speed after it has moved 2 m

he hockey puck on a ice is given the initial speed of 21 m/s. It comes to rest after sliding for 102m. Determine the kinetic friction coefficient between the puck and the ice.

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Explanation / Answer

1) both exert the same force on one another

2) a = 13/4 = 3.25 m/s^2

v = sqrt(2*a*s) = 3.6 m/s

3) v^2 - u^2 = 2*a*s

here v = 0
a = -v^2/(2*s) = -2.16 m/s^2

4) when the body in rest only normal force acts. no frictional force acts on the body

5) when the body moves with constant velocity, Fnet = 0

m*g*sin(theta) = mue*N

m*g*sin(25) = mue*m*g*cos(25)

===> mue = tan(25) = 0.47

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