Why does a girl skateboarding on a half-pipe not remain in motion forever?
a
none of the above
b
her energy is transformed into thermal energy from friction
c
her energy is destroyed by the friction of the skateboard and the concrete
d
her energy is used up
1 answer
The correct answer is (b) her energy is transformed into thermal energy from friction. As the girl skateboards on the half-pipe, there is friction between the skateboard and the surface of the half-pipe, which converts some of her kinetic energy into thermal energy. This loss of energy slows her down, eventually bringing her to a stop.
1 answer