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Physics 1A Midterm 2 Review Sheet – Work, Energy, and Momentum
1
A)
Work
‐
Is a scalar defined by
ܹൌܨ݀cosߠ
. For a straight line with a varying force…
ܹൌ
ܨ
௫
݀ݔ
௫
మ
௫
భ
‐
Power is the time derivative of work
ܲൌ
ௗ
ௗ௧
ܹ
‐
Work done by conservative forces is path
‐
independent, work done by non
‐
conservative
forces is path
‐
dependent
‐
Total work acting on a body is the scalar sum of the work done by the individual forces.
‐
It is related to energy via the Work
‐
Energy Theorem:
ܹൌ∆ܭ
B)
Energy
‐
Types of energy: kinetic, gravitational potential, spring potential, …
‐
Energy is a scalar! You can add them algebraically.
‐
Energy conservation equation is
∆ܧ ൌ ܹ
‐
In the case where there is no non
‐
conservative work, then
∆ܧ ൌ 0
‐
Energy is a state function, meaning that we don’t care what happens between point A to
point B, but we do care about points A and B.
o

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