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26 Cards in this Set

  • Front
  • Back
energy of motion
kinetic energy
energy due to position or energy that is stored in an object
potential energy
form of energy associated with ionic and covalent bonds between atoms
chemical energy
form of energy associated with the movement of objects
mechanical energy
form of energy that is associated with the motion of the particles that make up a substance
heat energy
how is work calculated
force x distance
what is the SI label for work
joules
how much work does a person do when they push against a wall with an 800 Newton force for 25 seconds?
none- the wall did not move
the work done by a machine
work output
how is the efficiency of a machine calculated
work output divided by work input times 100
what is the SI unit of power
watts
how is power calculated
work divided by time
1000 watts
kilowatt
746 watts
horsepower
Two people do the same amount of work. Explain how they may each develop a different amount of power.
If one person does the work in a shorter amount of time, he/she develops more power.
the pivot point of a lever
fulcrum
list the 6 simple machines
lever, pulley, screw, wedge, inclined plane, wheel and axle
number that indicates how many time a machine multiplies the applied force
mechanical advantage
how do you find the mechanical advantage of a pulley system
count the number of strand (don't include any strand you pull down on)
name 3 ways a machine can make work easier
change the force, the direction of the force, or the distance the force is applied
type of current where electrons move only in one direction
direct current
type of current that comes out of a household outlet
alternating current
measure of the amount of energy electrons have
voltage
unit of electrical resistance
ohm
state the relationship among electrical resistance, voltage, and current (Ohm's law)
voltage = current x resistance
a branching circuit
parallel circuit