Question

Zoe rides her bike down a steep hill and has to use the brakes a lot to keep from crashing. At the bottom of the hill, she notices that her bike’s brakes have gotten very hot. Why?(1 point) Responses The force Zoe applied by going down the hill increased the motion of particles in the bike chain’s oil, which caused it to undergo a state change into a gas form and stop lubricating the brakes, causing the brakes to heat up. The force Zoe applied by going down the hill increased the motion of particles in the bike chain’s oil, which caused it to undergo a state change into a gas form and stop lubricating the brakes, causing the brakes to heat up. The acceleration Zoe applied by going down the hill converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up. The acceleration Zoe applied by going down the hill converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up. The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up. The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up. The force Zoe applied by using the brakes made the bike gain so much kinetic energy that it underwent a state change, causing the brakes to heat up.

Answer 1

The correct response is: The force Zoe applied by using the brakes converted the bike’s kinetic energy into thermal energy, causing the brakes to heat up.

When Zoe applies the brakes, the kinetic energy of the bike (the energy due to its motion) is transformed into thermal energy (heat) due to friction between the brake pads and the wheel. This process causes the brakes to become hot.