EWP Flashcards
1
Q
Energy,E
A
The capacity to do work. SI unit: Joule, J
2
Q
Kinetic Energy
A
Energy a body possesses due to its motion
KE=1/2mv^2
3
Q
Gravitational potential energy
A
Energy which a body possesses due to its position relative to the ground.
GPE=mgh (note: mass is in kg!)
4
Q
Chemical potential energy
A
Energy stored in food, fuel or electrical cells
5
Q
Elastic potential energy
A
Energy stored in a body due to its elastic deformation
6
Q
Principle of conservation of energy
A
- Energy cannot be created or destroyed
- It can only be converted from one form to another or transferred from one body to another
- The total amount of energy in an isolated system is constant
7
Q
Efficiency
A
Ratio of useful energy output to total
energy input
8
Q
Work, W
A
Product of the force on an object and the distance moved in the direction of the force. Can also be the change in energy. (SI unit: joule, J)
W=fs
9
Q
Resultant force
A
F=ma
10
Q
Power,P
A
Rate of work done.
P=W/t
P=Change in E/t
