# Kinetic and Potential Energy with acceleration

1. Oct 16, 2012

### salthegemini

1. The problem statement, all variables and given/known data
A 4-kg mass is launched with zero initial velocity on a frictionless circular track. The speed of the mass at point 1 is 20 m/s (base of the curve). The mass then travels along a rough horizontal surface between points 1 and 2 (L-4m, μk=0.3). It then travels up a frictionless slope.

Part a had me calculate the height is was dropped from using the velocity at point 1 and it came out to a height of 20.41m and the Kinetic Energy at the base was 800J

Part b) Find the acceleration of the system as it travels from point 1 to 2.

2. Relevant equations
F=ma
A=(Vinitial-Vfinal)/t

3. The attempt at a solution
I realize that the friction will slow down the velocity over the length but I don't know how to tie the velocity and acceleration together while including friction.

2. Oct 16, 2012

### tiny-tim

welcome to pf!

hi salthegemini! welcome to pf!
nothing accelerates unless there's a force

to find the acceleration, first find the force