1. Teaching Point: “To analyze how pulleys change the effort force to do work.”
Do now Discussion: Which of the two pulleys here do you think makes work easier? Why do you think so?

2. TP: “To analyze how pulleys change the effort force to do work.”
Three Types of Pulleys
Fixed Pulley- does not decrease effort force, but does change the direction of force needed to do work.
MA = 1

3. TP: “To analyze how pulleys change the effort force to do work.”
Three Types of Pulleys
Movable Pulley- decreases effort force to do work by half.
MA = 2

4. TP: “To analyze how pulleys change the effort force to do work.”
Three Types of Pulleys
System of Pulleys- decreases effort force by using multiple pulleys linked together

5. TP: “To analyze how pulleys change the effort force to do work.”
How Pulleys Work

6. TP: “To analyze how pulleys change the effort force to do work.”
Quick Assessments
The more pulleys to put together, the higher your mechanical advantage.
True or False
A movable pulley makes the work easier by decreasing the _____________ in order to do work:
a. output force
b. load force
c. resistance force
d. effort force

7. Intellectual Engagement
TP: “To analyze how pulleys change the effort force to do work.”
Intellectual Engagement
How do you think the world would be different if we did not have pulleys to help life heavy objects more easily? Give some examples.

8. Class Activity- Pulleys
TP: “To analyze how pulleys change the effort force to do work.”
Class Activity- Pulleys
Instructions: Using what we just learned about pulleys… Task A- illustrate the use of a fixed pulley picking up an object. Add labels for effort force and load force. Task B- illustrate the use of a movable pulley picking up an object. Add labels for effort force and load force. Task C- illustrate the use of both a fixed and movable pulley picking up an object. Add labels for effort force and load force. Flexible Group- take out your portfolio and meet me in the back of the room at my desk.

9. TP: “To analyze how pulleys change the effort force to do work.”
Lesson Summary
In your tables of four, go back into your notes and consider what we have just learned today, and then…
1. Identify three (3) important concepts we learned today
2. Place those the three in order from the most important concept to least important.