A block hangs at rest from the ceiling by a piece of rope. Consider the forces acting on the block. A block hangs from the ceiling by a spring. Consider the forces acting on the block when it is as rest.

A ball is shot into the air with a spring-loaded cannon. Consider the forces acting on the ball while it is in the air.
A skydiver ( who hasn’t opened his parachute yet) falls at terminal velocity. Consider the forces acting on the skydiver)

Force Present or Absent?
-Gravity
-Spring
-Tension
-Normal
-Friction
-Air Resistance