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SPH4U: Review Force Diagrams (FDs) In each case the rock is acted on by one or more forces. Assume there is no friction or air resistance unless mentioned or implied by the situation. Draw a force diagram (free body diagram) showing all forces acting on the rock. Draw a squiggly acceleration vector with it. Write an scalar equation for the net force in each direction. Compare the size of force vectors relative to one another, indicating whether they are greater, less than or equal. Please pencil so that you can correct your mistakes! Label the forces using the following symbols: F g = the force due to gravity, FT = the force of tension, Fn = the normal force, Ff = the force of friction, Fair = the force of air resistance. Situation The rock is falling. The rock is falling at constant (terminal) velocity due to air resistance. The rock tied to a rope is at rest. The rock is rising in an arc. The rock is at the top of its arc FD Fnetx Fnety Compare Forces The rock is at rest. The rock is sliding at constant speed. The rock is slowing down due to friction The rock is tied to a rope and is pulled upward such that it is accelerating up The rock tied to a rope is swinging. .