Jan. 15
Objectives:
• Identify measurements needed to determine unknown values in lever calculations.
• Weigh a shoe on a meter stick with fulcrum at 50 cm and a single known weight.
Bell Ringer:
(1) Define work (1 sentence)
(2) Draw a diagram of a lever system and label the four parts.
(3) If one end of a lever is pushed down 6 cm with 30 N of force, how far does the other end move up if it has 22.5 N of force?
Lesson:
1. Weigh a shoe on a meter stick with fulcrum at 50 cm and a single known weight.
2. Disrepant event: move shoe farther from fulcrum and see it "act" heavier.
3. Explain work and torque.
4. Teach students to discriminate between work and torque.
5. Measure and calculate torque in a lever system.
6. Quiz on “work” and “levers”
Assignment:
Complete “Lab: Weigh your Shoe.”