# Determine the components of force

1. Apr 8, 2009

### joemama69

1. The problem statement, all variables and given/known data
the boy of mass 40kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r=1.5m, theta=.7t radians, and z = -.5t m, where t is in seconds. Determine the components of force for F(r), F(theta), and F(z) which the slides exerts on him at the instant t=2. Neglect the size of the boy

2. Relevant equations

a(r)=r''-r(theta)'^2 F(r)=ma(r)
a(theta)=r(theta)''+2r'(theta)' F(theta)=ma(theta)
a(z)=z'' F(z)=ma(z)

3. The attempt at a solution

I got F(r)=-29.4 N and I got 0 for the other 2 Forces. Is this corect

2. Apr 8, 2009

### LowlyPion

In the way you have answered it, I'd say it looks correct.

But the question seems to ask for the components "for" these forces, and I am not sure that they don't want the components ... you know like the friction force offsetting the acceleration effects from gravity?

3. Apr 8, 2009