These are the forces we'll be using as we label our Free-body diagrams:
In each diagram, identify the type of force by adding a subscript. These are vectors, so the length of the arrows drawn matters!
Start in the center and point outwards!
In diagrams where something is on a ramp, keep in mind some key rules:
Gravity always goes straight down towards the center of the earth.
Normal force, or the oppositional force of a surface, is perpendicular to the surface. The ground in holding the bike up (straight up from itself), it's not pushing sideways.
Gravity always goes straight down towards the center of the earth.
Normal force, or the oppositional force of a surface, is perpendicular to the surface. The ground in holding the bike up (straight up from itself), it's not pushing sideways.
This means that the force that is opposing the normal force is a component vector of gravity.
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