- #1
CiCi
- 5
- 1
1. The Problem Stament, all variables and given data
a 15 kg crate, initially at rest, slides down a ramp 2.0 m long and inclined at an angle of 20 degrees with the horizontal. if there is a constant force of kinetic friction of 25 N between the crate and ramp, what kinetic energy would the crate have at the bottom of the ramp?
2. Needed equations
Work = PE + KE + Energy Lost
PE= mgh
Height = Sinθ * Length
KE= (1/2) m*v^2
3. Attempt at solution
okay so I know how to start out with finding PE
PE= mass* gravity* height = 15 * 9.8 * height
Find Height
Height= Sin (20°) * 2.0= .684
PE= 15 * 9.8 * .684 = 100.5 Joules
What's throwing me off is the kinetic friction of 25 N, I'm not sure what to do with it and where to plug it into to
a 15 kg crate, initially at rest, slides down a ramp 2.0 m long and inclined at an angle of 20 degrees with the horizontal. if there is a constant force of kinetic friction of 25 N between the crate and ramp, what kinetic energy would the crate have at the bottom of the ramp?
2. Needed equations
Work = PE + KE + Energy Lost
PE= mgh
Height = Sinθ * Length
KE= (1/2) m*v^2
3. Attempt at solution
okay so I know how to start out with finding PE
PE= mass* gravity* height = 15 * 9.8 * height
Find Height
Height= Sin (20°) * 2.0= .684
PE= 15 * 9.8 * .684 = 100.5 Joules
What's throwing me off is the kinetic friction of 25 N, I'm not sure what to do with it and where to plug it into to