Answer to Question #272953 in Physics for Girl

Question

1.      A child starts sledding from rest, going down a 40 m long 7.5° incline, then coasting across a horizontal stretch. The mass of the sled + child is 35 kg, and the coefficient of kinetic friction is 0.060.

a.      Make force diagrams for the sled + child on both the hill and the horizontal stretch.

b.      Resolve the weight of the sled + child along and perpendicular to the plane.

c.      Determine the reaction force on the sled + child.

d.      Determine the speed of the sled + child at the bottom of the incline.

e.      How far along the horizontal stretch does the sled + child travel before stopping?

h.      Determine how much work is done on the sled + child by the gravitational force while the child + sled is moving along the incline.

i.       By considering the energy of the system and energy transformations, determine the speed of the sled + child at the bottom of the incline. Does your answer agree with part d?

Answer 1

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