A skier coasts down a gentle slope at constant speed. Select all the energy chan

Question

A skier coasts down a gentle slope at constant speed. Select all the energy changes that apply (more than one) to the system, which comprises skier, Earth, snow surface, air around the skier. I am going to suggest that it is not a long journey and that the skier therefore burns approximately zero calories in gliding down the hill. [Also there are no springs involved, so there are no changes in spring potential energy i.e. I am assuming that the stretch of the various tendons and ligaments in the skier's body does not change... they hold the same position on the way down.] I strongly suggest that you draw an energy bar chart in your workbook to accompany this question.

Kineticenergyincreases

kinetic energy decreases

gravitational potential energy stays the same

gravitational potential energy increases

gravitational potential energy decreases

thermal energy stays the same

thermal energy increases

thermal energy decreases

chemical energy stays the same

chemical energy increases

chemical energy decreases

Kineticenergyincreases

kinetic energy decreases

gravitational potential energy stays the same

gravitational potential energy increases

gravitational potential energy decreases

thermal energy stays the same

thermal energy increases

thermal energy decreases

chemical energy stays the same

chemical energy increases

chemical energy decreases

Explanation / Answer

1. gravitational potential energy decreases as skier moves down the hill.

2. thermal energy increases as the heat is produced due friction.

Kinetic energy do not changes as speed is consant. Chemical energy do not changes as no food is consumed.

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