Presentation on theme: "Pulleys. Definition A pulley is a grooved wheel with a rope, chain, or cable running along the groove."— Presentation transcript:
Definition A pulley is a grooved wheel with a rope, chain, or cable running along the groove.
Fixed Pulleys A fixed pulley is similar to a 1 st class lever! The wheel is the fulcrum and the rope on both sides is the effort and resistance! A fixed pulley is attached to something that doesn’t move, like the ceiling or wall –Ex: Elevator Fixed pulleys do NOT increase force. They only change direction. Small IMA!
Movable Pulleys A movable pulley is one in which one end of the rope is fixed and the wheel is free to move. Movable pulleys DO increase force and therefore can have a large MA!
Block and Tackle Pulleys Block and tackle pulleys are a combination of fixed and movable pulleys. They can have a large MA!