Draw free body diagrams:
A rectangular block being accelerated on a horizontal, frictionless surface.
A skydiver who had just jumped from a plane and hasn't reached terminal velocity.
A cube being accelerated up a 30° incline with μk > 0.
A pendulum bob that has just been released at an angle of 25° from the vertical.
The Attempt at a Solution
I'm pretty sure about the first three, but not so sure about the last one.
Sorry but I forgot about the theta, I'll put up the new picture soon.
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