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SPH3U: Force Diagrams (Free Body Diagrams - FBDs)
In each case the rock is acted on by one or more forces. Assume there is no friction or air resistance unless mentioned. For each:
 Draw a force diagram (also known as a free body diagram, or FBD) showing all forces acting on the rock.
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Fg = the force due to gravity, Ft = the force of tension, Fn = the normal force,
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Label the forces using the following symbols:
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Draw a squiggly acceleration vector.
Compare the size of force vectors relative to one another, indicating whether they are greater, less than or equal. Please use a
ruler and a pencil so that you can correct your answers.
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Ff = the force of friction, Fair = the force of air resistance.
 The rock is falling.
 The rock is at rest.
The rock is falling at
constant (terminal) velocity
due to air resistance.
 The rock is sliding at
constant speed.
 The rock tied to a rope is at
rest.
The rock is slowing down
due to friction.
 The rock is rising in an arc.
 The rock is tied to a rope and
is pulled upward such that it is
accelerating up
 The rock is at the top of its
arc
The rock tied to a rope is
swinging.