14 Questions
What is a pulley, in its simplest form?
A wheel spinning around an axle to aid motion
What is the purpose of using two pulleys in a system?
To create a simple belt and pulley system
What is the main advantage of using pulleys in lifting heavy loads?
They lessen the applied force needed to lift an object
What is the main difference between a fixed pulley and a movable pulley?
The amount of force applied
What is an example of a movable pulley?
A block and tackle
What is the purpose of a block and tackle system?
To lessen the applied force needed to lift an object
What is the main advantage of using compound pulleys?
To change the direction of force
What is the mechanical advantage of a block and tackle pulley?
3
Which of the following is NOT an example of a movable pulley?
Fixed pulleys
What is another name for compound pulleys?
Combination pulleys
Which of the following is an example of a pulley in everyday life?
Sewing machine motors
What are the two types of pulleys found in a block and tackle pulley system?
Fixed and movable
What is the purpose of the size and design of a compound pulley's wheel and rope?
To lessen the effort required
Which of the following is NOT a type of block and tackle pulley?
Compound pulley
Study Notes
Pulleys: Simple Machines
- A pulley is a wheel spinning around an axle to aid the motion of a belt.
- Pulleys are used to change the direction of force and transmit power across axes.
Types of Pulleys
-
Fixed Pulley: Changes the direction of the input force but does not change the amount of force applied.
- Mechanical advantage: 1
- Examples: Flag pole, Water bucket of a well
-
Movable Pulley: Increases the amount of force applied but does not change the direction of force.
- Mechanical advantage: 2
- Examples: Elevators, Construction cranes
-
Compound Pulley: Combination of fixed and movable pulleys, changing direction of force and making weight feel lighter.
- Examples: Gym equipment (e.g., chest exercises, lat pulls-down exercise machines)
-
Block and Tackle Pulley: A system of movable and fixed pulleys, increasing the mechanical advantage.
- Mechanical advantage: 3
- Examples: Gyn tackle, Gun tackle, Double luff tackles
Pulleys in Everyday Life
- Escalators & elevators
- Gym or exercise equipment
- Curtains & Blinds
- Hanging plant pots
- Well bucket
- Sewing machine motors
- Sliding doors
- Rock climbing equipment
- Construction cranes
- Fishing rods
- Sailing boats
- Washing machine
Learn about the basics of pulleys, a type of simple machine, and how they aid motion through belt systems. Understand how to create a basic pulley and how two pulleys can be used together.
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