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awc1990
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What is the formula for work? W =
W = (Force)(distance)cosθ = Fdcosθ

What is the unit of work?
The unit of work is the Joule (N*m).

What is the formula for power? P =
P = =

What is the unit of power?
The unit of power is the Watt (1 joule/sec).

What is the formula for kinetic energy? KE =
KE = =

What are the units of KE?
The units of KE are joules.

What is the formula for gravitational potential energy? U =
U = (mass)(gravity)(height) = mgh

What are the units of gravitational potential energy?
The units of GPE are joules.

(T/F) The total mechanical energy of a body is the sum of its kinetic and potential energies.
True.

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

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.

What is the formula for momentum? p =
p = (mass)(velocity) = mv

What is the formula for impulse J? J =
J = (Force)(time) = Ft = mvmv_{0 }= Δp

Is kinetic energy conserved in a completely elastic collision?
Yes, kinetic energy is conserved in a completely elastic collision.

(T/F) Net external force must equal zero for conservation of momentum to occur.
True.

What is the formula for the center of mass for two masses, m_{1} and m_{2}, lying along the xaxis at points x_{1} and x_{2}? X =
X =

(T/F) Momentum is not conserved in an inelastic collision.
False, momentum is conserved in both elastic and inelastic collisions.

