physical science
Terms
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- resistance arm
- the part of the lever that exerts the resistance force
- screw
- a simple machine consisting of a special type of inclined plane wrapped in a spiral around a cylindrical post.
- wheel and axle
- a simple machine consisting of 2 different-sized wheels that rotate together, such as a doorknob or wheel-handled faucet.
- resistance force
- the force exerted by a machine to overcome resistance to gravity or friction
- wedge
- A simple machine consisting of a moving inclined plane with one or two sloping sides; examples are knife and chisels
- How many simple machines are there? Name them.
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(6)
lever, pulley, wheel and axle, inclined plane, screw, wedge. - simple machine
- a device that accomplishes work with only one movement.
- pulley
- a simple machine consisting of a grooved wheel with a rope or chain running along the groove
- bionics
- The science of designing artifiacial replacement (prostheses parts for the body.
- compound machine
- A combination of 2 or more machines
- efficinency
- ratio of the useful work put out by a machine to the work put into that machine; effeiciency is always less than 100%
- effort arm
- the part of a lever on which an effort force (F ) is applied
- power
- the measure of the amount of work done in a specific amount of time; power is measured in watts and equals 1 joule/second
- mechanical advantage
- the number of times a machine multiplies the effort force applied to it.
- effort force
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the force applied to a machine when a machine is used to do work.
- machine
- a device that makes work easier by changing the size of the force applied to it and /or the direction of that force.
- Fulcrum
- the fixed point around which a lever pivots
- ideal machine
- a machine in which work input equals work output; such a "perfect" machine would be frictionless and 100% efficient
- inclined plane
- a simple machine consisiting of a sloping surface (ramp) used to raise objects
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lever
- a simple machine consisting of a bar that is free to pivot (rotate) around a fixed point (fulcrum)