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