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**Projectile motion**corresponds to a_{y}= - g and generally assumes no air resistance (a_{x}= 0).If we choose our coordinate system such that (x(0), y(0)) is the origin, we then have 7 potential unknowns, 4 equations and 35 possible problems for a single projectile.

- An object constrained to move in a circular path undergoes
**centripetal acceleration**. Since**v**is always perpendicular to**r**(and therefore tangent to the circle):and both v and r are constant (assuming

**uniform circular motion**),**Δv**/ v =**Δr**/ r.a

whose direction is toward the center of the circle._{centripetal}= v^{2}/ r,

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©2010, Kenneth R. Koehler. All Rights Reserved. This document may be freely reproduced provided that this copyright notice is included.