1. 1. A box at rest on a level table. Weight Normal BalancedUNbalanced

2. 2. A box being dragged to the right at a constant speed on a level surface. Weight Normal BalancedUNbalanced Pull Drag

3. 3. A crate accelerated to the right on a level surface. Weight Normal BalancedUNbalanced Pull Drag

4. 4. A box moving to the right on a level surface and sliding to a stop. Weight Normal BalancedUNbalanced Pull Drag

5. 4. A box moving to the right on a level surface and sliding to a stop. Weight Normal BalancedUNbalanced Drag OR

6.  5. A box at rest on an incline. UNbalancedBalanced Weight Normal Friction Wt acting down incline (Wt ) Wt acting against incline (Wt )

7.  6. A box sliding down an incline at 2 m/s. UNbalancedBalanced Weight Normal Friction (Wt )

8. UNbalancedBalanced 7. A rock free falling off the side of a cliff. Weight Air Drag

9. UNbalancedBalanced 8. A hovering helicopter. Weight Lift

10. UNbalancedBalanced 9. A helicopter accelerating upward. Weight Lift

11. UNbalancedBalanced 10. A helicopter accelerating downward. Weight Lift

12. UNbalancedBalanced 11. An airplane in level flight moving forward at 400 km/hr. Weight Lift Drag Thrust

13. UNbalancedBalanced 12. An airplane in level flight and speeding up. Weight Lift Thrust Drag

14. UNbalancedBalanced 13. An airplane climbing at a constant speed. Weight Thrust Air Drag

15. UNbalancedBalanced 14. A large box being pushed against a vertical wall. Box PUSHED up against wall Wall PUSHING back on box Weight Normal FLOOR WALL

16. UNbalancedBalanced 15. A person standing in an elevator that is not moving. WeightFloor pushing up

17. UNbalancedBalanced 16. A person moving upward in an elevator at a constant speed. WeightFloor pushing up

18. UNbalancedBalanced 17. A person accelerating upward in an elevator. Weight Floor pushing up

19. UNbalancedBalanced 18. A person moving downward in an elevator at a constant speed. WeightFloor pushing up

20. UNbalancedBalanced 19. A person moving upward in an elevator that is slowing down to a stop. Floor pushing up Weight

21. UNbalancedBalanced 20. A satellite that is orbiting the earth at a constant speed. Weight