Question

What is tangential versus radial acceleration? Use a diagram to aid your answer.

How do athletes on a curve (runners, cyclists, skaters etc.) turn? What is the source of radial acceleration? How might this differ on a banked turn?

What force keeps an object like a baseball or a hammer throw along a curved path? What happens to the object when it is released? Why is this relevant to timing of athletic tasks?

Answer 1

Acceleration that is along tengent on a curve is tengential acceleration. It is basicaly rate of change of speed.

acceleration that is perpendicular to velocity is centripital acceleration.  

When athletes turn on a curve they lean there body and friction force between them and ground provide necessary centripital force for turning.

when turning on banked surface normal reaction provides necessary centripital force for turning.

Centripital force (which is tension in case of hammer throw) keeps objects along curve. When they are released they move along direction of velocity i.e along tengent to curve.