- #1
galaticman
- 8
- 0
Homework Statement
1. Homework Statement
A block of mass 0.015kg enters the bottom of a circular, vertical track with a radius R = 0.3m at an initial velocity of 4/ms. If the block loses contact with the track at an angle of 130 degrees, what is Wk, the work done by kinetic friction?
Homework Equations
F=ma
Wtot= Wmg+WN+WFk=1/2*mvf2-1/2*mvi2
The Attempt at a Solution
So far I have that Wmg=-mg*(Rcos50+R)=-0.072447J and that WN=0 J
The only part that I am having trouble with is finding vf right before that block leaves the track. Any help would be appreciated!
EDIT: I am not sure how to go about relating F=ma=mv2/R without knowing what the friction force is ie. fk
Last edited: