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52 Cards in this Set
- Front
- Back
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Work
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The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force.
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The Formula for work is __________
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Work = Force x Distance
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Work is measured in_______
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Joules
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Power
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A quantity that measures the rate at which work is done or energy is transformed.
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The formula for power is ___________
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Power=Work/Time
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Power is measured in _______
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watts
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Machines ______ and ______ forces.
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multiply and redirect
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Different forces can do _____ amount of work.
A. tremendous B. Same C. Different |
A. same
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Mechanical Advantage tells how much a machine ______ force or _______ distance.
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Multiplies, Increases
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Formula for mechanical advantage ______
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Mechanical Advantage=
Output Force / Input Force= Input Distance/ Output Distance |
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Mechanical Advantage
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a quantity that measures much a machine multiplies force or distance.
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Simple Machines
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one of the six basic types of machines, which are the basics for all other forms of machines
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The lever family
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Exp. Lever, Wheel, And, Axle.
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Levers are divided into_____ classes.
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three
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Pulleys are modified _____
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levers
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A ___________ is a lever or pulley connected to a shaft.
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wheel and axle
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The inclined plane family
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Exp. Screw, wedge, simple inclined plane.
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Inclined planes _________ and ______ force.
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multiply and redirect
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wedge
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a modified inclined plane.
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screw
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an inclined plane wrapped around a cylinder.
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compound machine
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a machine made up of more than one simple machine.
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Energy is measured In _______
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joules
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Potential Energy
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The energy that an object has because of the position, shape, or condition of the object
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Potential Energy is _____
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stored energy
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Gravitational potential energy depends on both _____ and ______.
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mass and height
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Formula for gravitational Potential Energy
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Grav. PE = mass x free-fall accerlation x height
PE = mgh |
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Height can be _____
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relative
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Formula for kinetic energy
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Kinetic Energy= ½ x mass x speed squared
KE=mv2 |
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Kinetic Energy
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The energy of a moving object due to the objects motion.
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Kinetic Energy depends on _____ and _____.
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mass and speed.
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Kinetic Energy depends on ____ more than ______.
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speed more than mass.
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Atoms and molecules have ______ energy.
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kinetic
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Chemical reactions involve _______ energy.
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potential
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Living things get ____ from the sun.
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Energy
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The sun get energy from ______ reactions.
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nuclear
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Electricity is a form of _____.
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energy
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Light can carry across __________ .
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empty space
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_______ energy can become ______ energy.
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Potential, kinetic
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_______________- explain the flight of a ball.
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Energy transformations
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________ ________ explain a bouncing ball.
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Energy transformations
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_________ _______- can change to other forms of energy.
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Mechanical Energy
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Energy can not be _______ or ______.
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created or destroyed.
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Energy doesn’t _______ and ________.
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appear or disappear.
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The _______________ describes energy conservation.
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first law of thermodynamics
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Scientist study ______ _______
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energy systems
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Systems may be ______ or ______.
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open or closed.
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Not all the work done by a _______ is useful work.
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machine
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Effiency is the ratio of useful ____to ____.
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work out to work in.
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Effiency
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a quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input.
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Formula for efficiency
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Effiency= Useful Work Output/ Work Input.
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Perpetual motion machines are _________
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impossible.
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Machines need _______ ______.
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energy input.
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