3-4 How do pulleys work?
OBJECTIVES: Explain how pulleys make work easier. Compare fixed and movable pulleys.
Key Term
pulley: rope wrapped around a wheel.
Lesson Summary
• A pulley is a rope wrapped around a wheel.
• Pulleys can change the direction of a force, the size of a force, or both.
• A fixed pulley is attached to something that does not move.
• A movable pulley can move as the rope is pulled through it.
• A block and tackle is a pulley system made up of both fixed and movable pulleys.
Key Term
pulley: rope wrapped around a wheel.
Lesson Summary
• A pulley is a rope wrapped around a wheel.
• Pulleys can change the direction of a force, the size of a force, or both.
• A fixed pulley is attached to something that does not move.
• A movable pulley can move as the rope is pulled through it.
• A block and tackle is a pulley system made up of both fixed and movable pulleys.
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