1. What is Work?
Chapter 4

2. What is work? Work: When a force is exerted on an object
The object moves
Motion is in the same direction as the force
Example: Parent pushes child in a stroller

3. Station 1 Push the wall as hard as you can Did you provide a force?
What direction was your force?
Did the wall experience motion?
If so, what was the direction of its motion?
Did you perform work?

4. Station 1 Push the jug of water backwards Did you provide a force?
What direction was your force?
Did the water jug experience motion?
If so, what was the direction of its motion?
Did you perform work?

5. Station 2
Hold the dumbbell in your hand at your side (hanging down at your waist)
Did you provide a force while holding the dumbbell still?
What direction was your force?
Did the dumbbell experience motion once it was at your side?
If so, what was the direction of its motion?
Did you perform work?

6. Station 2 Hold the dumbbell still over your head
Did you provide a force while holding the dumbbell still?
What direction was your force?
Did the dumbbell experience motion once it was above your head?
If so, what was the direction of its motion?
Did you perform work?

7. Station 2 Curl the dumbbell Did you provide a force?
What direction was your force?
Did the dumbbell experience motion?
If so, what was the direction of its motion?
Did you perform work?

8. Station 3 Open the door Did you provide a force?
What direction was your force?
Did the door experience motion?
If so, what was the direction of its motion?
Did you perform work?

9. Station 3 Close the door Did you provide a force?
What direction was your force?
Did the door experience motion?
If so, what was the direction of its motion?
Did you perform work?

10. Station 3 Pull on the handle from the inside so the door stays shut
Did you provide a force?
What direction was your force?
Did the door experience motion?
If so, what was the direction of its motion?
Did you perform work?

11. Station 4 Push the desk to the right Did you provide a force?
What direction was your force?
Did the desk experience motion?
If so, what was the direction of its motion?
Did you perform work?

12. Station 4 Push down on the desk firmly Did you provide a force?
What direction was your force?
Did the desk experience motion?
If so, what was the direction of its motion?
Did you perform work?

13. Station 4 Try to lift the desk from the end with the water containers
Did you provide a force?
What direction was your force?
Did the desk experience motion?
If so, what was the direction of its motion?
Did you perform work?

14. Station 5 Pick the chair up Did you provide a force?
What direction was your force?
Did the chair experience motion?
If so, what was the direction of its motion?
Did you perform work?

15. Station 5 Push the chair to the left Did you provide a force?
What direction was your force?
Did the chair experience motion?
If so, what was the direction of its motion?
Did you perform work?

16. Station 5 Sit in the chair
Did you provide a force while sitting on the chair?
What direction was your force?
Did the chair experience motion?
If so, what was the direction of its motion?
Did you perform work?

17. Station 6
Throw a pencil to the left (then pick it up and set it back please)
Did you provide a force?
What direction was your force?
Did the pencil experience motion?
If so, what was the direction of its motion?
Did you perform work?

18. Station 6
Hold a pencil in your hand with your arm extended out in front of you
Did you provide a force while holding the pencil still?
What direction was your force?
Did the pencil experience motion once it was held in front of you?
If so, what was the direction of its motion?
Did you perform work?

19. Station 6 Push a pencil across the table to the right
Did you provide a force?
What direction was your force?
Did the pencil experience motion?
If so, what was the direction of its motion?
Did you perform work?

20. What is Work?
Non-work
If you exert a force but the object does not move
Pushing on a couch but the couch does not move
Holding something at a constant height

21. What is Work?
If you exert a force but the object does not move in the same direction
Holding an object at a constant height and carrying it forward
Your force is vertical but the motion is horizontal

22. What is Work? Pushing a box that moves Is a force exerted? YES
What is the direction of the force? FORWARD
Does the box move? YES
What is the direction of movement? FORWARD
Does this meet all 3 parts of the work definition? YES

23. What is Work? Pushups Is a force exerted? YES
What is the direction of the force? DOWN
Does the man move? YES
What is the direction of movement? UP
Does this meet all 3 parts of the work definition? NO