Physics 4.1.7-8 Work, Energy, Power and Conservation of Energy

10 flashcards · Physics · by TheoTyson

1. What is work done?

   The amount of energy transferred from one form to another.

2. What are the equations for work done?

   W = Fs\text{W = Fs}W = Fs W = Fs\text{W = Fs}W = Fs cos⁡θ\cos{\theta}cosθ

3. What is the area under a force displacement graph?

   The work done.

4. What is power?

   The rate of doing work, energy per second.

5. What are the equations for power?

   P=ΔWΔt\text{P} = \frac{\Delta \text{W}}{\Delta \text{t}}P=ΔtΔW​ , P=EΔt\text{P} = \frac{E}{\Delta \text{t}}P=ΔtE​ P = Fv\text{P = Fv}P = Fv

6. What is the principle of conservation of energy?

   Energy cannot be created or destroyed, it can only be transferred from one form to another.

7. What is the equation for efficiency?

   efficiency=useful output powerinput power\text{efficiency} = \frac{\text{useful output power}}{\text{input power}}efficiency=input poweruseful output power​

8. What is kinetic energy, and what is the equation?

   The energy of anything moving, Ek = 12mv2\text{E} _k \text{ = } \frac{\text{1}}{\text{2}} \text{mv} ^2Ek​ = 21​mv2 .

9. What is gravitational potential energy, and what is the equation?

   The energy gained lifting something up, ΔEp = mgΔh\Delta \text{E} _p \text{ = } \text{mg} \Delta \text{h}ΔEp​ = mgΔh .

10. What is elastic potential energy, and what is the equation?

    The energy in stretching something, E = 12ke2\text{E = } \frac{\text{1}}{\text{2}} \text{ke} ^2E = 21​ke2 .