Podcast
Questions and Answers
What is the main function of a fixed pulley?
What is the main function of a fixed pulley?
changing the direction of the force
Where should the fulcrum be positioned when using a class 1 lever to lift a load?
Where should the fulcrum be positioned when using a class 1 lever to lift a load?
closest to the load
What is the key characteristic of a second class lever?
What is the key characteristic of a second class lever?
the load is in the middle
What is the term for the point where a lever pivots?
What is the term for the point where a lever pivots?
What is an example of a wheel and axle in everyday life?
What is an example of a wheel and axle in everyday life?
What is the relationship between the distance the lever moves and the effort required, when using a lever?
What is the relationship between the distance the lever moves and the effort required, when using a lever?
What is the characteristic of a class 1 lever that allows it to be balanced?
What is the characteristic of a class 1 lever that allows it to be balanced?
What is the purpose of a belt system in mechanics?
What is the purpose of a belt system in mechanics?
What is required for the wheels to move in opposite directions in a belt system?
What is required for the wheels to move in opposite directions in a belt system?
Why do the teeth of gears need to be the same size?
Why do the teeth of gears need to be the same size?
What determines the class of a lever (class 1, 2, or 3)?
What determines the class of a lever (class 1, 2, or 3)?
What is the role of the fulcrum in a lever system?
What is the role of the fulcrum in a lever system?
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Study Notes
Types of Levers
- A Class 1 lever has the same amount of weight on both sides to be balanced.
- A Class 2 lever has the load in the middle.
Pulleys
- A fixed pulley makes work easier by changing the direction of the force.
- A moveable pulley helps do work by changing the amount of effort needed to lift the force.
Levers in Real World
- Examples of levers in real world include paint roller and roller blades.
Fulcrum, Effort, and Load
- The fulcrum is the point in which a lever pivots.
- To use a Class 1 lever to lift a load, the fulcrum should be closest to the load.
Gears
- The teeth of gears need to be the same size.
- The direction of gear movement can be determined by the direction of rotation of the drive gear.
Belts and Wheels
- A belt system can be designed to show wheels driving in the same direction and speed.
- A belt system can be designed to show wheels driving in different speeds and directions.
- To make wheels move in opposite directions, the belt system needs to be changed.
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