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Dynamics: Particle Velocity

Velocity is the change in displacement over time. Velocity can be expressed by equations 1.

Velocity equation Straight Line (2)

ds = Change in displacement

dt = Change in time


For example a particle travels a distance of 100m in 20s what was its velocity. The particle was not accelerating.

v = 100m/20s = 5 m/s


The equation above only deals with velocity that is occuring in one direction. We however live in a 3-dimensional world, which means oftens times the velocity in the x-direction, y-direction, and z-direction would also need to be considered. Vector algebra would be used to calculate a magnitude for these velocities. Refer to equation 2.

Velocity Magnitude (2)

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