1. 7.7A
contrast situations where work is done with different amounts of force to situations where no work is done such as moving a box with a ramp and without a ramp, or standing still
Verb: Contrast
Rigor: Analysis

2. So what does this mean? Contrast vs.
Situations of work with different amounts of force
(i.e. moving a box with a ramp or with no ramp)
vs.
Situations where no work is done
(i.e. standing still)

3. pushing
on a wall
plant growing
towards sunlight
downward growth
of roots
book sitting on a table
blood
exerting
pressure on
the wall
of a vein
flexing
your
arm
hot air
pushing against the walls of the balloon
lifting a box
apples sitting
on the ground 1 3 2 5 6 4 7 8 9

4. 1. Force?
Yes/No
Explain
________________________________________________
________________________
2. Force?
3. Force?
4. Force?
5. Force?
6. Force?
7. Force?
8. Force?
9. Force?

5. WORK no
yes

6. TABLE TALK What is work? How do we calculate work?
Refer back to your cards. In how many pictures is work being done?
Explain.
Place post it on the wall.

7. MAKE SOME OBSERVATIONS

8. Investigating Work
Using two meter sticks set up a ramp ~ 25 cm high. Place the meter sticks ~ 3 cm apart.
Using a spring scale measure the amount of force needed to lift the book to top of the book stack.
Record the amount of force and distance lifted.
Using a spring scale pull the book up the ramp. Record the amount of force and distance pulled.
Carry the book a distance of 1 meter. Record the distance and force used to carry the book.

9. Investigating Work Task Force (N) Distance (m) Work (J)
Lifting the book to the top of the stack of books
Pulling the book up the ramp.
Walking with the book 1 meter.
TASK 1
TASK 2
TASK 3

10. SCENARIO 1:
Joey is pushing a box up a ramp a distance of 5 meters with a force of 34 Newtons. Calculate the amount of work done.
SCENARIO 2:
John is pulling a box across the floor a distance of 5 meters with a force of 52 Newtons. Calculate the amount of work done.

11. SCENARIO 1:
Robert is pushing a box 3 meters
down the hall with a force of
200 Newtons.
SCENARIO 2:
Sam has to move a box to the
second floor. He decides to use a
pulley to help him lift the box 3
meters up. He uses a force of
100 Newtons to lift the box.

12. SCENARIO 1:
Brandy uses a force of 2 Newtons
to lift a pen a distance of .25
meters.
SCENARIO 2:
Ted pushes against the wall with
all his might. He pushes so hard he
begins to sweat. Ted pushed
against the wall for 30 seconds
with a force of 30 Newtons.

13. SCENARIO 1:
A father raised his child 0.25
meters off the ground with a
force of 6 Newtons.
SCENARIO 2:
The librarian carries a heavy stack
of catalogued books 15 meters
across the library. Today, she
completes this task in a record
time of 120 seconds.

14. SCENARIO 1:
A student is going to
lift a box. He kneels
down to place his
hands around the
box.
SCENARIO 2:
The student lifts the
box 0.5 meters off the
ground with a force of
8 Newtons.
SCENARIO 3:
The student stands
with the box while
adjusting his weight.
He is getting ready to
walk while carrying
the box.

15. SCENARIO 1:
Joey is pushing a box up a ramp a distance of 10 meters with a force of 26 Newtons. Calculate the amount of work done.
SCENARIO 2:
John is pulling a box across the floor a distance of 5 meters with a force of 52 Newtons. Calculate the amount of work done.
Compare and contrast scenario 1 and scenario 2 in terms of work.
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

16. SCENARIO 1:
Robert is pushing a box 3 meters down the
hall with a force of 200 Newtons.
SCENARIO 2:
Sam has to move a box to the second floor.
He decides to use a pulley to help him lift
the box 3 meters up. He uses a force of
100 Newtons to lift the box.
Compare and contrast scenario 1 and scenario 2 in terms of work.
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

17. SCENARIO 1:
Brandy uses a force of 2 Newtons to lift a
pen a distance of .25 meters.
SCENARIO 2:
Ted pushes against the wall with all his might.
He pushes so hard he begins to sweat. Ted
pushed against the wall for 30 seconds with a
force of 30 Newtons.
Compare and contrast scenario 1 and scenario 2 in terms of work.
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Who did more work? Explain. ______________________________________________________________________________________________________________________________________________________

18. SCENARIO 1:
A father raised his child 0.25 meters off the
ground with a force of 6 Newtons.
SCENARIO 2:
The librarian carries a heavy stack of
catalogued books 15 meters across the
Library. Today, she completes this task in
a record time of 120 seconds.
Compare and contrast scenario 1 and scenario 2 in terms of work.
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Who did more work? Explain. ______________________________________________________________________________________________________________________________________________________

19. SCENARIO 1:
A student is going to lift a
box. He kneels down to
place his hands around the
box.
SCENARIO 2:
The student lifts the box 0.5
meters off the ground with a
force of 8 Newtons.
SCENARIO 3:
The student stands with the
box while adjusting his weight.
He is getting ready to walk
while carrying the box.
Compare and contrast scenario 1, 2, and 3 in terms of the work done.
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

20. A student slides her notebook 5 meters across the table
A student slides her notebook 5 meters across the table. She uses a force of 2 Newtons when she moves the notebook. How much work did she do?
Calculate work.
Some students are helping their parents load a moving truck. They are trying to move a washer machine. They push on the washing machine with all of their strength, but it doesn't move at all. If the washing machine has a weight force of 1500 N. How much work did they do?

21. 3-2-1 3 things you learned 2 things you have a question about
1 thing you found interesting!