- #1
Sam Fred
- 15
- 0
Homework Statement
Assume that the athlete approaches the take-off line from the left with a horizontal
velocity of 10m/s, remains in contact with the ground for 0.1s, and take off at a 60°angle
with a velocity for 10m/s, determine (1) the vertical component of the average impulsive
force exerted by the ground on his foot. (2) the horizontal frictional force. The mass of
the athlete is 100kg and the coefficient of kinetic friction (μk) is 0.1.
Homework Equations
momentum 1 + ƩF Δt = momentum 2
Friction force = Normal force X μk
The Attempt at a Solution
1)In the vertical Direction
0+(Ry-Weight) Δt = mvsin60
Ry = 9660 N
2)
Friction Force = Ry X μk = 966 N (I think this is wrong)