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science 6 chapter 9

STUDY
PLAY
energy
the ability to do work
potential energy
stored energy
kinetic
energy due to motion
mechanical
ability to make something move
motion
change of an objects position
speed
rate
instantaneous speed
the car's speed at one particular moment
velocity
objects moving over a given time in a certain direction
acceleration
a change in velocity during a period of time
force
push or pull
friction
force that keeps objects moving from moving against other objects
momentum
mass and velocity of an object
work
to move something
newtons
force is measured by it
joule
a unit to measure work
machine
object that makes work easier
effort force
effort
resistance force
resistance
fulcrum
the spot where the bar turns or pivots
first-class lever
fulcrum is located between the effort and the resistance
second-class lever
fulcrum located between the effort and the resistance
third-class lever
effort between the resistance and the fulcrum
pulley
grooved wheel with a chain or rope wrapped around it
fixed pulley
a pulley that does not move
moveable pulley
it moves with the load or resistance
block and tackle
it combines multiple fixed and moveable pulleys
mechanical advantage
decrease in effort that is need to move an object
wheel and axel
consists of a wheel, rod, or and axle running through the wheel
inclined planed
a flat inclined surface
wedge
two inclined planes back-to-back
screw
inclined plane wound around a cylinder or cone
threads
ridges in the screw
compound machine
combines two or more simple machines to make work even easier