- #1
dorkymichelle
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Homework Statement
A motorcycle and 60.6 kg rider accelerate at 3.5 m/s2 up a ramp inclined 7.3° above the horizontal. What are the magnitude of (a) the net force on the rider and (b) the force on the rider from the motorcycle?
Homework Equations
F=ma
Fg= mg
3. The Attempt at a Solution
I'm going to use F1 = force that is making the rider go up, which is exerted from the motorcycle ?
F2 is component of gravity that opposes the motorcycle from going up.
so netforce = F1-F2
F= ma
F1-F2=ma
F2 = sin 7.3degrees = y/mg
F2 = sin 7.3degrees = y/60.6*9.8
F2=75.46
using F1-F2 = ma
I got
F1-75.46 = 60.6*3.5
F1-75.46 = 212.1
F1 = 287.56
So force that motorcycle exerts on rider is 287.56 N, since that is what's making the rider and motorcycle go up.
I also think that the net force is 287.56 because you have gravity and normal force that cancels out, then you have F1 and F2 and F1-F2 = 287.56 N
I think where I went wrong is not putting in the mass of the motorcycle, but I'm not sure how to find that?