Topic 8- Energy Flashcards
1
Q
What happens to energy when it changes stores in a closed system?
A
No net change in total energy
energy cannot be ceated or destroyed
2
Q
What can energy be stored as
A
1) Elastic potential
2) Gravitational potential
3) Kinetic
4) Sound
5) Light
6) Heat
7) Chemical
8) Nuclear
3
Q
Work done (j) =
A
distance (m) x force (n)
It is the entire force applied/energy transfered
4
Q
GPE=
A
Mass x Gravitational field strength x change in height
5
Q
KE =
A
1/2 x mass x velocity^2
0.5MV^2
6
Q
GPE=KE
velocity?
A
Velocity^2 = 2 x Hieght x gravity
v^2=2HG
7
Q
Example of energy loss/ dissipation
A
-Kettle:
Useful (heat)
waste (sound)
8
Q
What is power?
A
raate of energy tansfer
9
Q
Power =
A
Work done/ time
P=E/T
10
Q
Watt =
A
One joule/ second
11
Q
Efficiency=
A
Useful energy/Total energy
