Work, Energy and Power Flashcards
1
Q
Energy =
A
Something that enables physical work to be done
2
Q
Work =
A
The result of when force acts upon an object to cause a displacement
3
Q
Power =
A
The rate at which work is done upon an object
4
Q
Work (J) =
A
force (N) x distance (m)
5
Q
Work measure in :
A
Joules (J)
6
Q
Force measured in :
A
Newtons (N)
7
Q
Distance measured in :
A
Metres (m)
8
Q
GPE (J) =
A
= mass (Kg) x gravity (N/kg) x height (m)
9
Q
KE (J) =
A
½ x mass (Kg) x velocity**2 (m/s)
10
Q
Law of the conservation of energy :
A
Energy cannot be created or destroyed. It can only be changed from one form to another
11
Q
9 different forms of energy in the universe
A
- Kinetic Energy
- Thermal Energy
- EPE Energy
- Sound Energy
- Nuclear Energy
- Electrical Energy
- GPE Energy
- Chemical Energy
- Light Energy
12
Q
Power (W) =
A
work (J) / time (s)
13
Q
Efficiency =
A
useful energy transferred ÷ energy supplied) × 100
14
Q
Energy changes that take place for a bouncing ball
A
- A falling ball transfers GPE into KE
- When the ball hits the ground, its shape changes and the KE is transferred into EPE
- As its shapes is restored the EPE changes back into KE
- As the bouncing ball gets higher in the air, KE is transferred back into GPE
