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30 Cards in this Set
- Front
- Back
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What is work?
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the transfer of energy to an object by the application of a force that causes the object to move in the direction of the force
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What is power?
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a quantity that measures the rate at which work is done
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What is mechanical advantage?
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a quantity that expresses how much a machine multiplies force or distance
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What is a simple machine?
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a machine that is the basis for all other forms of machines
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What is a compound machine?
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a machine made of more than one simple machine
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What is energy?
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the capacity to do work
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What is potential energy?
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the energy that an object has because of its position, shape, or condition
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What is kinetic energy?
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the energy of an object due to the object's motion
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What is mechanical energy?
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the amount of work an object can do because of the object's kinetic and potential energies
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What is efficiency?
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a measure of how much useful work a machine can do
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What is temperature?
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a measure of the average kinetic energy of the particles in an object
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What is a thermometer?
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an instrument that measures and indicates temperature
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What is absolute zero?
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the temperature at which molecular energy is at a minimum
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What is heat?
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the energy transferred between objects that are at different temperatures
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What is conduction?
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the transfer of energy as heat through a material
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What is convection?
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the movement of matter due to differences in density that are caused by temperature variations
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What is convection current?
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the cycle of heated fluids that rises and then cools and falls
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What is radiation?
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the energy that is transferred as electromagnetic waves
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What is specific heat?
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the quantity of heat required to raise a unit mass of homogenous material 1 K or 1 C in a specified way given constant pressure and volume
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What is entropy?
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a measure of the randomness or disorder of a system
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What is a heat engine?
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a machine that transforms heat into mechanical energy
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When is work done?
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only when force is applied to an object and the object moves in the same direction as the applied force
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What is the work of an object that is NOT moving ( ALWAYS ) ?
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0 J
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Why do machines make work easier?
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because they change the amount of input force
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If friction is ignored, what is ma equation? If it isn't ignored?
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od/id; of/if
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What are the six types of simple machines?
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lever, pulley, wheel and axle, inclined plane, wedge, and screw
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What is a first class lever?
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the fulcrum is in the middle
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What is a second class lever?
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fulcrum is at one end, input force is at the other end
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What is a third class lever?
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always multiply distance rather than force, fulcrum is at one end, output force is at the other end, input force in middle
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If a machine has a ma of less than one, does it multiply force or distance?
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distance, and vice versa
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