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79 Cards in this Set

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  • Back
  • 3rd side (hint)
device that makes work easier
simple machine
device that does work in one movement
effort force
force applied to machine
resistance force
force applied by machine
ideal machine
work input = work output
mechanical advantage
number of times machine multiplies the effort force
bar that is free to pivot about a fixed point
fixed point on a lever
effort arm
part of lever on which the effort force is applied
resistance arm
part of the lever that exerts the resistance force
grooved wheel with rope or chain running along the groove
wheel and axle
simple machine consisting of two wheels of different sizes
inclined plane
sloping surface used to raise objects
inclined plane wrapped in a spiral around a cylindrical post
inclined plane with one or two sloping sides
compound machine
a combination of two or more simple machines
measure of how much of the work put in is changed to useful work put out by the machine
rate at which work is done
watt (W)
one Joule per second : standard of power
transfer of energy through matter by direct contact of particles
any material that can flow
transfer of energy through the movement of matter
transfer of energy in the form of invisible waves
materials that do not let heat move easily through them
device with large surgace area designed to heat the air near it by conduction
solar energy
energy from the sun
heat engines
devices that convert thermal energy into mechanical energy
internal combustion
fuels burned inside the engine
external combustion
fuels burned outside the engine
resistance to heat flow
rapid burning
heat mover
device that removes thermal energy from one location and transfers it to another location at a different temperature
heat pump
two way heat mover
ability to cause change
kinetic energy
energy in the form of motion
potential energy
stored energy
transfer of energy through motion
mechanical energy
total amount of energy in a system
law of conservation of energy
energy can not be created nor lost/destroyed under normal conditions
measure of average kinetic energy of the particles in a sample of matter
thermal energy
total energy of the particles that make up a material
the energy that flows from something with a higher temperature to somethign with a lower temperature
specific heat
amount of energy it takes to raise the temperature of 1 [one] kilogram of the material
newton's second [2nd] law of motion
a net force acting on an object causes the object to accelerate in the direction of the force
air resistance
force air exerts on a moving object
terminal velocity
highest velocity reached by a falling object
anything thrown or shot through the air
centripetal acceleration
acceleration towards the center of a curved or circular path
centripetal force
force that causes a moving object to moce in a curved or circular path
isometic exercises
muscles push against other muscles with or without gravity
newton's third [3rd] law of motion
describes action reaction pair this way: for every action there is an equal and opposite reaction
property a moving object has dut to its mass and velocity
law of conservation of momentum
the total amount of momentum of a group of objects does not change unless outside forces act on the object
acceleration of gravity near earth
rate of change in position ("rate of motion")
instantaneous speed
rate of motion at any given instant
constant speed
a speed that does not vary
average speed
total distance traveled divided by total time of travel
describes both speed and direction
the rate of change in velocity
time interval
amount of time that passed while the change of velocity was taking place
Δ means what?
"delta" = change in
push or pull one body exerts on another
balanced forces
forces that are equal in size and opposite in direction
net force
the resulting velocity of an object when multiple forces are applied to it
the tendency of an object to resist any changes in motion
force that opposes motion between two surfaces that are touching eachother
attracting force exerted by every object on every other object. the amount of the force depends on the masses of the objects and their distance apart
measure of the force of gravity on an object, usually the force between earth and an object at its surface
change over time
newton's first [1st] law of motion
(Law of inertia)
an object at rest stays at rest and an object in motion stays in motion unless an outside force acts upon it
amount of matter in an object
name the strokes
1.) intake stroke
2.) compression stroke
3.) power stroke
4.) exhaust stroke
intake stroke
carburator - gas is broken into fine droplets and mixed with air. intake valves open, piston moves down - takes in fuel-air mixture
compression stroke
intake valve closes - piston moves up, fuel-air mix is squeezed/compressed into a smaller space
power stroke
hot spark ignites fuel-air mix
hot gases expand - piston down
exhaust stroke
piston moves up, compresses the waste products left over from the burning the fuel-air mix. valves open, let waste out
diesel engines
fuels is injected into compressed air in the cylinder - engine has NO spark plugs, hot enough to ignite self
metric measurements ++ values
kilo - 1000
hecto - 100
deka - 10
meter -1
deci -.1
centi -.01
milli -.001