Jan. 14
Objectives:
• Calculate work, force and distance given the other two parts of the equation.
• Uses units with every measurement.
• Name and identify several different units of force, several different units of distance and several different units of work (discriminate between mass & force)
• Levers as example of system in machines. (see Bill Nye-Simple Machines)
• Identify parts of lever system (compare to math “functions;” input, output, operation, parts)
• Determine missing measurement when provided with other three measurements in lever system by calculating work=force x distance; work in = work out.
Bell Ringer:
(1) If you had 30 Newtons of force moving a box 3 meters, how much work would that be?
(2) Are there some ways we do the same work with less effort? Explain.
Lesson:
1. Collect Parent sign form & “Work” worksheet.
2. Demonstrate lever and show how the work in equals the work out (teeter-totter type lever is good example.)
3. Show “Bill Nye” simple machines movie (very general and broad introduction based on “work.”
4. Discuss: why do we use machines if they do not reduce the “work?”
5. Introduce Levers:
(a) Draw lever system (compare to mathematical function: input, output, etc.)
(b) Identify parts of lever (fulcrum, lever, effort/force/input, resistance/force/output.)
(c) Solve one or two lever examples on board.
Assignment:
Complete “Intro to Levers” worksheet.