# Physics Flashcards - Work, Energy, Momentum

The flashcards below were created by user awc1990 on FreezingBlue Flashcards.

1. What is the formula for work? W =
W = (Force)(distance)cosθ = Fdcosθ
2. What is the unit of work?
The unit of work is the Joule (N*m).
3. What is the formula for power? P =
P =  =
4. What is the unit of power?
The unit of power is the Watt (1 joule/sec).
5. What is the formula for kinetic energy? KE =
KE =  =
6. What are the units of KE?
The units of KE are joules.
7. What is the formula for gravitational potential energy? U =
U = (mass)(gravity)(height) = mgh
8. What are the units of gravitational potential energy?
The units of GPE are joules.
9. (T/F) The total mechanical energy of a body is the sum of its kinetic and potential energies.
True.
10. Is total mechanical energy a constant if the only forces that act on a body are conservative (E = K + U = constant)?
Yes, E = K + U = constant
11. What is the change in energy of a system if only conservative forces act upon it?
If only conservative forces act on a body, then ΔE = 0.
12. What is the formula for momentum? p =
p = (mass)(velocity) = mv
13. What is the formula for impulse J? J =
J = (Force)(time) = Ft = mv-mv= Δp
14. Is kinetic energy conserved in a completely elastic collision?
Yes, kinetic energy is conserved in a completely elastic collision.
15. (T/F) Net external force must equal zero for conservation of momentum to occur.
True.
16. What is the formula for the center of mass for two masses, m1 and m2, lying along the x-axis at points x1 and x2? X =
X =
17. (T/F) Momentum is not conserved in an inelastic collision.
False, momentum is conserved in both elastic and inelastic collisions.
 Author: awc1990 ID: 212350 Card Set: Physics Flashcards - Work, Energy, Momentum Updated: 2013-04-09 07:30:21 Tags: Physics Flashcards Work Energy Momentum Folders: Description: Physics Flashcards - Work, Energy, Momentum Kaplan MCAT P16-P20 Show Answers: