A greased pig slides down a curved ramp. Categorize her motion as one of the following:

A) Constant velocity (zero acceleration), also known as "sixth grade kinematics".

B) Constant acceleration of magnitude g or g*sin(theta)

C) Constant acceleration of some other value

D) Changing acceleration of two or more discreet values.

E) Continuously changing acceleration

Solution: E. The acceleration at an instant could be calculated as g*sin(theta). But since the angle with respect to horizontal is changing, the acceleration is changing.