Simple machine pulley
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There are three types of pulleys: fixed pulleys, which change the direction of an applied force but do not move with the load; movable pulleys, which move along the rope together with the load and multiply the applied force without changing its direction; and block and tackle systems, which use a combination of fixed and movable pulleys to lift very heavy loads with increased force but at the cost of speed.
Simple machine pulley
- 1. PULLEY
- 2. PULLEY kind of wheel that turns on an axle
- 3. 3 Kinds of Pulley
- 4. Fixed Pulley - does not travel with the load. - changes the direction of the applied force.
- 5. Example:
- 6. A FLAGPOLE IS A FIXED PULLEY BECAUSE …… - in a flagpole, there is a fixed pulley at the top of the flagpole. The flag which is attached to the other end of the rope moves up as the other end of the rope is pulled down and if the other end is pulled up the flag goes down.
- 7. MOVABLE PULLEY - moves along the rope together with the load - used to multiply the applied force -does not change the direction of the applied force
- 9. BLOCK AND TACKLE A combination of fixed and movable pulleys.
- 10. BLOCK AND TACKLE ADVANTAGES DISADVANTAGES Can lift heavy loads easier than a single pulley Takes a longer time to raise a heavy load Gain in force Loss of speed in raising an object