Quiz answers

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1.for each question first find the force and then the [[#|work]].

a)A 3.0-kg book is being lifted from the floor to a desk 0.60m from the floor.

F=m x g
=3.0kg x 9.8N/kg
=29.4N


W=F x D
=29.4N x 0.60m
=17.64j

b)a crane lifts a 5500-kg slab to a height of 35.0m.
F=m x g
=5500kg x 9.8N/kg
=53,900N

W=F x D
=53,900N x 35.0m
=1,886,500j

c) the breaks of a truck [[#|apply]] a force of 20 000N to bring a truck to stop in a distance of 100.0m.
F=m x g
=20 000N x 9.8N/kg
=196,000N

W= F x D
=196,000N x 100.0m
=19,600,000j

2.for each question answer if it is potential to kinetic on kinetic to potential.


a) a plane lands then stops on a runway.

kinetic to potential

b) an [[#|apple]] falls from a tree.

potential to kinetic

c) a person runs then stops to take a rest.

kinetic to potential