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Unformatted text preview: EXAM 3
SAR Physics
Andrew M Kolchin
USEFUL FORMULAE
1. Deﬁnition of Momentum (For an object or for a group of
objects): Momentum = mass * velocity; p = mv
2. Deﬁnition of an Impulse
Impulse = Force * Time interval; I = F ∆t
3. ImpulseMomentum Theorem:
Impulse applied to an object = The change in momentum
of the object; F ∆t = m ∆v
4. Momentum Conservation: A system’s momentum does not
change if there are no external forces on the system.
5. Work done on an object = the force on the object in the
direction of its motion * the distance the object moves;
W =F ∗d
6. Power is the rate at which work is done: P = W/∆t.
7. Gravitational Potential Energy = weight * height
8. Kinetic Energy (K.E.) = 1
2 m v2 9. Conservation of Energy: Energy can’t be created or destroyed, only transformed from one form to another or tranferred from one place to another.
10. For a machine: Work Input = Work Output; Win = Wout .
11. For a machine: Mechanical Advantage = (Output Force)/(Input
Force).
12. Newton’s Second Law: F = ma
13. Deﬁnition of Acceleration: Time rate of change of velocity;
a = ∆v/∆t
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 Spring '08
 Staff
 Physics, Force, Mass, Momentum

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