P1.1 Conservation of energy Flashcards
1
Q
What is a system?
A
An object or a group of objects
2
Q
What is a closed system?
A
Where there is no net change to the energy stored in the system
3
Q
What is the conversation of energy?
A
Energy can neither be created nor destroyed
4
Q
What energy transfers happen to a bungee jumper after jumping off the platform?
A
Energy is transferred from gravitational potential stored to the kinetic store as the jumper accelerates due to the force of gravity
Rope tightens - kinetic energy decreases and elastic potential increases
Jumper comes to a stop as all of the energy is in the elastic potential energy store
5
Q
Why don’t bungee jumpers return to their original height?
A
Because some energy was transferred to the thermal energy store of the surroundings by heating
