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Grades 612. Investigate the ability of pulleys (simple machines) to create a mechanical advantage. Students build 3 different pulley systems using fixed and movable pulleys. For each system, they measure the force needed to lift a load, calculate the mechanical advantage, and calculate the percentage of efficiency. Materials support 10 groups of 3 students.
Grades 612. Students build the following pulley systems:
To further challenge students, teachers are provided instructions to build a more complex pulley system using 4 different lengths of rope, 4 movable pulleys, and 1 fixed pulley. In this system, only 2 rope segments support the load. Counting ropes to determine the mechanical advantage does not work. Challenge students to explain why and calculate the mechanical advantage.
Extend this lesson by:
Students build 3 different pulley systems using fixed and movable pulleys. For each system, they measure the force needed to lift a load, calculate the mechanical advantage, and calculate the percentage of efficiency. Materials support 10 groups of 3 students. A ring stand, ring, hanging mass set, spring scale, and meter stick for each group are needed but not supplied. Includes teacher’s manual with reproducible student guide.
|Pulley Cord, Roll||1||Included|
|Digital Resource Instruction Card||1||Included|
|Teacher's Manual with Reproducible Student Guide||1||Included|
|Rings||10||Needed, Not Included|
|Ring Stands||10||Needed, Not Included|
|Hanging Masses (50 to 200 g)||10||Needed, Not Included|
|Spring Scales or Force Sensors (measuring in newtons)||10||Needed, Not Included|
|Meter Sticks||10||Needed, Not Included|
|Scissors||10||Needed, Not Included|