Questions and Answers
What is the primary function of a pulley?
To change the direction of the force applied
What type of pulley system can actually lessen the applied force needed to lift an object?
Block and tackle pulley system
What is the mechanical advantage of a fixed pulley?
1
What is a mechanical linkage?
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What type of pulley is attached to a stationary object above the load?
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What is the mechanical advantage of a block and tackle pulley?
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How many types of linkages are there?
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What is the primary function of a Reverse-Motion Linkage?
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What is an example of a movable pulley?
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What is the purpose of a compound pulley?
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What is the primary function of a Push-Pull Linkage?
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What is the primary function of a Parallel-Motion Linkage?
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What is a common use of pulleys in everyday life?
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What is the primary function of a Bell-Crank Linkage?
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What is the advantage of using pulleys in lifting heavy loads?
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How do you decide which type of linkage to use?
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What type of pulley is used in gym equipment?
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Where are linkages used?
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What is the advantage of simplifying complex linkages?
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What is the benefit of combining simple linkages?
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Study Notes
Mechanical Linkages
- A mechanical linkage is a collection of parts joined together to change or help movement.
- There are many types of linkages, but they can be simplified to forms of rotary and linear motion.
- Four main types of linkages are:
- Reverse motion linkage
- Parallel motion linkage
- Crank and slider linkage
- Bell crank linkage
Types of Linkages
- Reverse motion linkage: can make objects or forces move in opposite directions.
- Push-Pull linkage: can make objects or forces move in the same direction.
- Parallel motion linkage: can make objects or forces move in the same direction, but at a set distance apart.
- Bell crank linkage: can change the direction of objects or force by 90°.
Applications of Linkages
- Linkages are used everywhere, including:
- Food whisk
- Bicycle
- JCB digger
- F1
- Everyday cars
- Double-glazed windows
- Old-fashioned wooden toys that move
Pulleys
- A pulley is a wheel spinning around an axle to aid the motion of a belt.
- Pulleys are used for lifting heavy loads and transmitting power across axes.
- Examples of pulleys include:
- Sprockets on a bike
- Elevators
- Cranes
- Boats
Types of Pulleys
- Fixed pulley: changes the direction of the input force but does not change the amount of force applied.
- Movable pulley: does not change the direction of the force but increases the amount of force applied.
- Compound pulley: combines fixed and movable pulleys to change the direction of force and make the weight feel lighter.
- Block and tackle pulley: a type of compound pulley that uses multiple movable pulleys and fixed pulleys to increase the mechanical advantage.
Everyday Applications of Pulleys
- Pulleys are used in everyday life, including:
- Escalators and elevators
- Gym equipment
- Curtains and blinds
- Hanging plant pots
- Well bucket
- Sewing machine motors
- Sliding doors
- Rock climbing equipment
- Construction cranes
- Fishing rods
- Sailing boats
- Washing machine
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