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1) A gas consists of a large number of molecules
2) Molecules move with a range of speeds
3) The volume of the molecules is negligible compared with the volume of the gas itself
4) the collisions of the molecules with each other and the container walls are elastic
5) Molecules exert no forces on each other or the container except when in contact
6) Duration of collisions is very small compared with time between collisions
7) Molecules obey Newton's laws of mechanics |
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No external forces - momentum stays the same.
(m1v1 + m2v2)before = (m1v1 + m2v2)after |
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| Total momentum of a System |
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Definition
| m1v1 + m2v2 = Ptotal (total momentum) |
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Average Fnet = ΔP/ΔT
If ΔT is infinitesimally small, this is the instantaneous force - not average.
Area under F - t graph is Impulse. |
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W = Fd cosθ
1J = 1 Newton-meter
When net force F performs W work on body, kinetic energy changes by W
W can also equal to ΔE when resistive forces such as friction exist (W = ΔE) |
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Definition
Ep = mgh
Change in potential energy,
Ep = mgΔh |
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Ek = ½ mv^2
Change in Kinetic Energy
Ek = (½ mv^2)final - (½ mv^2)initial |
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ω=2π/T
Radians per second, or just s-1 |
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| Ac = v^2 / R, and is directed towards center |
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| Gravitational Field Strength |
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Definition
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