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Questions and Answers
A lever creates a turning force at the fulcrum when a force is applied to one end.
A lever creates a turning force at the fulcrum when a force is applied to one end.
True (A)
A pulley can only lift objects by applying force from above.
A pulley can only lift objects by applying force from above.
False (B)
The wheel and axle are considered one type of simple machine that rotates around a central rod.
The wheel and axle are considered one type of simple machine that rotates around a central rod.
True (A)
An inclined plane can be used to elevate objects from a lower level to a higher level.
An inclined plane can be used to elevate objects from a lower level to a higher level.
A wedge has two unsharpened ends and is used to hold things together.
A wedge has two unsharpened ends and is used to hold things together.
A screw is essentially an inclined plane wrapped around a heavy cylindrical object.
A screw is essentially an inclined plane wrapped around a heavy cylindrical object.
The mechanical advantage of a machine refers to the smaller output force it provides.
The mechanical advantage of a machine refers to the smaller output force it provides.
Examples of a lever include a seesaw, crowbar, and scissors.
Examples of a lever include a seesaw, crowbar, and scissors.
Flashcards
Lever
Lever
A rigid bar that rests on a pivot point called the fulcrum. Applying a force to one end of the lever creates a turning force at the fulcrum.
Wheel and Axle
Wheel and Axle
A wheel that rotates around a central rod (the axle). A force applied to the wheel causes it to rotate, moving an object.
Pulley
Pulley
A wheel with a groove that holds a rope or cable. Pulling on one side of the rope raises an object attached on the other end.
Inclined Plane
Inclined Plane
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Wedge
Wedge
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Screw
Screw
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Mechanical Advantage
Mechanical Advantage
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Simple Machines
Simple Machines
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Study Notes
Simple Machines
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Lever: A rigid bar resting on a pivot point (fulcrum). Applying force to one end creates a turning force.
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Examples: See-saw, crowbar, scissors
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Wheel and Axle: A wheel rotating around a central rod (axle). Applying force to the wheel causes rotation.
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Examples: Door knob, bicycle wheel
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Pulley: A wheel with a groove that holds a rope or cable. Pulling on the rope changes the direction or magnitude of applied force.
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Examples: Lifting hills
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Inclined Plane: A flat surface at an angle. It reduces the force needed to move an object between different heights.
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Examples: Ramps, stairs
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Wedge: A triangular object used to split or separate objects. A wedge's thick end is its base, the pointed end is the tip.
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Examples: Knives, axes, doorstops
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Screw: An inclined plane wrapped around a cylinder or cone. Used to hold things together or lift heavy loads.
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Examples: Lightbulbs, jars, and drills
Mechanical Advantage
- Mechanical advantage describes how a machine multiplies force.
- A machine with a mechanical advantage of 25 means that 1 unit of input force results in 25 units of output force.
Classes of Levers
- Class 1 Lever: The fulcrum is between the effort and the load. Effort and load can be interchanged.
- Class 2 Lever: The load is between the fulcrum and the effort. An example is a wheelbarrow.
- Class 3 Lever: The effort is between the fulcrum and the load. Muscles in the body use this type.
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