Download Review FDs - RosedalePhysics

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.
.