pendulum Flashcards
1
Q
state the law of conservation of energy
A
energy cannot be created or destroyed only transferred from 1 store to another
2
Q
what is a system
A
an object/group of objects
3
Q
what is a closed system
A
no energy can enter or leave
4
Q
how to reduce unwanted energy tranfers
A
reducing friction (use lubricant)
5
Q
explain how energy is transferred through a bungee jumper
A
- stood on platform gravitational energy is at its highest
- jumper falls energy is transferred from the gravitational potential energy store to the kinetic energy store
- bungee rope starts to tighten kinetic energy is at its highest
- bungee rope is fully extended the kinetic energy store is zero (the jumper isn’t moving)
all energy is transferred to the elastic potential energy store - bungee rope recoils energy is transferred from the elastic potential energy store to the kinetic energy store
6
Q
why does the bungee jumper never return back to the original position
A
bungee jumper never return back to the original position. this is because energy is dissipated as thermal energy (friction with air particles, stretching effects in the bungee rope which isn’t fully elastic)
