Resolve the force of gravity into its parallel and perpendicular components so you can sum the forces.
Want Lecture Notes? This is an AP Physics 1 topic.
0:12 Drawing the Free Body Diagram
1:04 Introducing the parallel and perpendicular directions
2:19 Drawing the components of the force of gravity
2:49 Finding the angle used to resolve the force of gravity into its components
4:33 Solving for the force of gravity parallel
5:15 Solving for the force of gravity perpendicular
5:53 Redrawing the Free Body Diagram
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