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Questions and Answers
What is a lever?
What is a lever?
Made up of a bar that turns on a fixed point or a fulcrum.
Which of the following is an example of a lever? (Select all that apply)
Which of the following is an example of a lever? (Select all that apply)
- Light switch (correct)
- Hammer (correct)
- Wheelbarrow (correct)
- Seesaw (correct)
What is a screw?
What is a screw?
An inclined plane wound around a cylinder.
Which of the following items is an example of a screw? (Select all that apply)
Which of the following items is an example of a screw? (Select all that apply)
What is a pulley?
What is a pulley?
Which of these is an example of a pulley? (Select all that apply)
Which of these is an example of a pulley? (Select all that apply)
What does the term 'wheel and axle' refer to?
What does the term 'wheel and axle' refer to?
Which of the following are examples of wheels and axles? (Select all that apply)
Which of the following are examples of wheels and axles? (Select all that apply)
What is an inclined plane?
What is an inclined plane?
Which of the following are examples of inclined planes? (Select all that apply)
Which of the following are examples of inclined planes? (Select all that apply)
What is a wedge?
What is a wedge?
Which of the following items is an example of a wedge? (Select all that apply)
Which of the following items is an example of a wedge? (Select all that apply)
What is a block and tackle?
What is a block and tackle?
Which of the following items is an example of block and tackle? (Select all that apply)
Which of the following items is an example of block and tackle? (Select all that apply)
What is a moveable pulley?
What is a moveable pulley?
Which of the following are examples of moveable pulleys? (Select all that apply)
Which of the following are examples of moveable pulleys? (Select all that apply)
What is a fixed pulley?
What is a fixed pulley?
Which of the following examples illustrates a fixed pulley? (Select all that apply)
Which of the following examples illustrates a fixed pulley? (Select all that apply)
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Study Notes
Simple Machines Overview
- Simple machines are mechanical devices that change the direction or magnitude of a force, facilitating work.
Lever
- A lever consists of a bar that pivots at a fixed point known as a fulcrum.
- Examples: light switch, seesaw, hammer, wheelbarrow.
Screw
- A screw is an inclined plane wrapped around a cylinder, enabling it to convert rotational motion into linear motion.
- Examples: light bulb, drill, toothpaste cap, and tube.
Pulley
- A pulley consists of a rope that passes over a grooved wheel, primarily used to lift objects.
- Examples: flagpole, ski lift.
Wheel and Axle
- This consists of a central rod (axle) that allows the wheel to turn around it, reducing friction for movement.
- Examples: bike, car, wagon.
Inclined Plane
- An inclined plane is a flat or curved surface that elevates at one end, making it easier to lift objects.
- Examples: slide, stairs, ramp.
Wedge
- A wedge is formed by two inclined planes, featuring a wider end; used for cutting, splitting, or pushing objects apart.
- Examples: knife, teeth, axe, zipper.
Block and Tackle
- Block and tackle uses two or more pulleys working in tandem, enabling less force to lift heavier loads as additional wheels reduce required effort.
- Example: ropes on a ship.
Moveable Pulley
- A moveable pulley consists of a rope and wheel that shifts along a cable, providing mechanical advantage by distributing weight.
- Examples: zip line, cable car, and the wheel that slides on a pulley.
Fixed Pulley
- A fixed pulley consists of a wheel and rope that are affixed in place, primarily used to change the direction of force without altering position.
- Examples: the wheel and rope used to lift a bucket from a well, and window blinds.
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