Ch1 Conservation and dissipation of energy Flashcards
1
Q
8 Types of energy storage
A
Thermal Chemical Kinetic Gravitational Potential Nuclear Magnetic Elastic potential Electrostatic
2
Q
Conservation of energy
A
Energy cannot be created or destroyed, only transferred, stored or dissipated
3
Q
types of energy transfer
A
- mechanical- exerting a force
- electrical- through the movement of a charge through a potential difference
- heating
- radiation
4
Q
work done
A
force x distance(m)
5
Q
kinetic energy
A
1/2mv^2
6
Q
elastic potential energy
A
1/2ke^2
1/2Fe
7
Q
gravitational energy
A
mgh
8
Q
Hooke’s law
A
F=ke
9
Q
Wasted energy
A
thermal or sound waves
energy that is not usefully transferred
10
Q
efficiency
A
useful output energy/ total input energy
11
Q
5 ways of increasing efficiency
A
- lubricate moving parts to reduce friction
- use wires with as little electrical resistance as possible to reduce wasted thermal energy
- streamline the shapes of moving objects to reduce air resistance
- tighten loose parts to reduce vibration to cut out noise
- thermal insulation
12
Q
Power
A
work done/time
