Work and kinetic energy

[shenwei1988]

A hockey puck of mass m sits on a frictionless, horizontal table tied to a string of length L. The puck starts at rest, and accelerates to some speed v moving in a horizontal circle of radius L. The net work done on the hockey puck,depend on what? L,m,or r??

i forgot the formula for the circular motion.

 

[AFG34]

acceleration = velocity^2 / radius
net force = mass*velocity^2 / radius

 

[milan.007]

Work done is force x displacement.

 

[Doc Al]

Hint: Consider the Work-Energy theorem.