What is the force on the rider from the motorcycle?

[kittykatxox]

this is the problem:

A motorcycle and 63.6 kg rider accelerate at 3.1 m/s2 up a ramp inclined 9.1° 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?

I solved for a)

F=ma
= (63.6 kg)(3.1 m/s^2)
= 197.16 N

But I don't understand what b) means by the "force on the rider from the motorcycle"

 

[Doc Al]

But I don't understand what b) means by the "force on the rider from the motorcycle"

The force that the motorcycle exerts on the rider is just one force. What other forces act on the rider? (They all must add up to the net force, which you already calculated.)