Exam-style question
Try this first
In a roller coaster, what happens to the mechanical energy as it moves from the top of a hill to the bottom?.
- A.All mechanical energy is converted to potential energy.
- B.Mechanical energy is conserved without any loss.
- C.Some mechanical energy is converted to thermal energy due to friction.
- D.Mechanical energy increases as it descends.
Model answer
What a good answer should say
- Some mechanical energy is converted to thermal energy due to friction.
Explanation
Why this works
As the roller coaster descends, gravitational potential energy is converted to kinetic energy. However, due to friction and air resistance, some of this mechanical energy is dissipated as thermal energy, illustrating energy dissipation.
Common mistake
No common mistake is linked to this question yet.