*Question 1*:
The SI units of momentum are ...

- kg * m^2 / s
- m * kg / s^2
- kg * m / s

Answer: b, kg * m / s

*Question 2*:
Momentum is a

- scalar
- vector

Answer: b, vector (it has the same direction as its velocity component)

*Question 3*:
If the net external forces on an object are zero,
then its momentum must be

- zero
- constant
- neither

Answer: constant. The time derivative of momentum is force: dp ---- = external forces dt So if the external forces are zero, then the CHANGE in momentum with time must be zero; hence, momentum must be a constant

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This page maintained by Michael Richmond.
Last modified Feb 7, 2002.
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Copyright © Michael Richmond. This work is licensed under a Creative Commons License.