# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Roller coasters slow down because their energy disappears.
 A True B False C Either A or B D None of the above
Explanation:

Detailed explanation-1: -Roller coasters slow down because their energy disappears. Q. What kind of energy is in a moving skateboard?

Detailed explanation-2: -Potential energy is dissipated in this way throughout the course. Kinetic mechanical energy is not lost however. Rather it is transformed into thermal energy and sound due to the friction, which can be detected as an increase in temperature along the track and the roller cars’ steel wheels.

Detailed explanation-3: -The law of conservation of energy states that within a closed system, energy can change form, but it cannot be created or destroyed. In other words, the total amount of energy remains constant. On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride.

Detailed explanation-4: -Some of the energy input into the roller coaster system will leak out to the world through dissipative forces, causing the roller coaster to naturally slow down. Dissipative forces such as friction or drag result in some of the kinetic energy being “lost”, meaning transferred to heat or thermal energy.

There is 1 question to complete.