Energy in Dynamics Flashcards
1
Q
Work
A
The energy transferred when a force act on an object
2
Q
Work done on a force-displacement graph
A
Area under the graph
3
Q
Power
A
The rate of doing work or transferring energy
4
Q
Equation for power involving speed and force
A
P = Fv
5
Q
When does GPE formula not work?
A
When gravitational field strenth is not constant
6
Q
Conservation on energy
A
Energy cannot be created or destroyed. Energy can be transformed from one form to another but the total energy of a closed system will not change.
7
Q
Effect of resistive forces on energy of a system
A
- System does work against these forces
- Energy is lost from the system as thermal energy
8
Q
Benefits of efficient devises
A
- Cheaper
- Better for the environment
