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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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The ability to cause a change in or move matter.
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What is Energy? (48)
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5 forms including: Nuclear, Solar, Mechanical, Hydroelectric, & Plasma.
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A quantity of energy transfered by a force when it is applied to a body & causes the body to move in the direction of the force.
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What is Work? (284)
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An object must move for _____ to be done.
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A quantity that measures the rate at which work is done.
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What is Power? (286)
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Measured in Watts and Horsepower
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A quantity that measures how much a machine multiplies force or distance.
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What is Mechanical Advantage?
(291) |
A ratio of the output force of a machine to the input force.
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Any one of the six basic types of machines of which all other machines are composed.
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What are Simple Machines?
(291) |
Include the lever, screw, pulley, inclined plane, wedge, and Wheel & Axle.
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A machine made of one or more
simple machines. |
What is a Compound Machine?
(296) |
Ex. A car is made of wheels & axles, pulleys, levers, inclined plane et. al.
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The stored energy resulting from the relative positions of objects in a system.
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What is Potential Energy?
(290) |
Ex. a car parked on a hill has untapped energy
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The energy of a moving object due to its motion.
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What is Kinetic Energy?
(300) |
Ex. a car speeding through an intersection has great energy of motion.
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The sum of the kinetic and potential energy of large-scale objects in a system.
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What is Mechanical Energy?
(302) |
Ex. a child cranks the car puts it in gear and takes off down the hill = energy of gravity + engine output.
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A quantity, usually expressed as a percentage that measures the ration of useful work output to work input.
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What is Efficiency?
(312) |
No machine has ever been 100% efficient.
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A simple machine consisting of a bar that is forced to pivot (rotate) around a fixed point.
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What is a Lever?
(190) |
Classified as First Class, Second Class, & Third Class depending on where the fulcrum is placed.
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A simple machine consisting of a grooved wheel with a rope or a chain running along the groove.
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What is a Pulley?
(190) |
Ex. A windless used to pull up a waterbucket from a well.
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A simple machine consisting of two different-sized wheels
that rotate together. |
What is a Wheel and Axle?
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Ex. A doorknob or wheel-handled faucet
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A simple machine consisting of a sloping surface (ramp) used to raise objects.
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What is an Inclined Plane?
(294) |
Ex. A parking deck or car ramps for raising the car.
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A modified inclined plane that turns a single downward force into 2 forces directed out to the sides.
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What is a Wedge?
(295) |
Functions like two inclined planes placed back to back; ex. a wood splitting wedge.
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A ridgid arm of a lever that turns around a point.
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What is a Fulcrum?
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Determines whether it is a 1st, 2nd or 3rd class lever.
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The most common lever with the fulcrum in the middle of Input & Output Forces.
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What is a First Class Lever?
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Ex. Pliers or a hammer.
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The fulcrum is on one end,with the Input Force on the other end.
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What is a Second Class Lever?
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Ex. Wheelbarrow or nutcracker
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The fulcrum is on the end, the input force is in middle and output force on opposite end.
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What is a Third Class Lever?
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Ex. Your forearm.
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The terminal or station at which input enters a system
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What is the Input Force?
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That force applied initially in a system.
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The force of input multiplied by spreading work out over a larger distance
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What is the Output Force?
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Always larger than the input force.
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Multiple pulleys put together into a single unit.
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What is a Block & Tackle?
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Increases potential energy and mechanical advantage of a
simple machine single pulley. |
