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

1. A box at rest on a level table.

Weight

Normal

Balanced UNbalanced

2. A box being dragged to the right at a constant speed on a level surface.

Weight

Normal

Balanced UNbalanced

PullDrag

3. A crate accelerated to the right on a level surface.

Weight

Normal

Balanced UNbalanced

PullDrag

4. A box moving to the right on a level surface and sliding to a stop.

Weight

Normal

Balanced UNbalanced

PullDrag

4. A box moving to the right on a level surface and sliding to a stop.

Weight

Normal

Balanced UNbalanced

Drag

OR

5. A box at rest on an incline.

UNbalancedBalanced

Weight

Normal

Friction

Wt acting down incline

(Wt )

Wt acting against incline(Wt )

6. A box sliding down an incline at 2 m/s.

UNbalancedBalanced

Weight

Normal

Friction

(Wt )

(Wt )

UNbalancedBalanced

7. A rock free falling off the side of a cliff.

Weight

Air Drag

UNbalancedBalanced

8. A hovering helicopter.

Weight

Lift

UNbalancedBalanced

9. A helicopter accelerating upward.

Weight

Lift

UNbalancedBalanced

10. A helicopter accelerating downward.

Weight

Lift

UNbalancedBalanced

11. An airplane in level flight moving forward at 400 km/hr.

Weight

Lift

DragThrust

UNbalancedBalanced

12. An airplane in level flight and speeding up.

Weight

Lift

ThrustDrag

UNbalancedBalanced

13. An airplane climbing at a constant speed.

Weight

Thrust

Air Drag

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

UNbalancedBalanced

15. A person standing in an elevator that is not moving.

Weight

Floor pushing up

UNbalancedBalanced

16. A person moving upward in an elevator at a constant speed.

Weight

Floor pushing up

UNbalancedBalanced

17. A person accelerating upward in an elevator.

Weight

Floor pushing up

UNbalancedBalanced

18. A person moving downward in an elevator at a constant speed.

Weight

Floor pushing up

UNbalancedBalanced

19. A person moving upward in an elevator that is slowing down to a stop.

Floor pushing up

Weight

UNbalancedBalanced

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

Weight