Feb. 11
Objectives:
• Students will be able to determine AMA and efficiency in pulley systems
• Students will be able to draw pulley diagrams with correct number of supporting ropes.
Bell Ringer:
1) Draw a pulley system with an IMA of 3 and effort pulling up.
2) Draw a pulley system in which the effort moves 4 times farther than the resistance.
3) What is the efficiency in a pulley system if you pull 5 m with 5 N of force and this lifts a 20 N resistance a vertical distance of 1 m?
Lesson:
1) Review last days pulley worksheet: Pulleys; Calculate & Draw.
2) Collect worksheets from students
3) Review summative breakdown for this unit:
50% trebuchet:
• 10% drawing of trebuchet model; (due Monday, Feb 16)
• 30% trebuchet demonstration; (due Thursday, Feb 12)
• 10% reflection (due Wednesday, Feb 18)
50% paper test. (on Thursday, Feb 19)
Assignment:
1) Download and complete AMA Efficiency 2.
