Physics. Topic 1

One dimensional motion

By one dimension we mean that the body is moving only in one plane and in a straight line. Like if we roll a marble on a flat table, and if we roll it in a straight line (not easy!), then it would be undergoing one-dimensional motion.

There are four variables which put together in an equation can describe this motion. These are Initial Velocity (u); Final Velocity (v), Acceleration (a), Distance Traveled (s) and Time elapsed (t). The equations which tell us the relationship between these variables are as given below.

v = u + at

v² = u² + 2as click for calculator

s = ut + 1/2 at²

average velocity = (v + u)/2

Armed with these equations you can do wonderful things like calculating a cars acceleration from zero to whatever in 60 seconds !!

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