## Greim Time Ch. 9 Motion and Machines

##### Created by:

glcassidy  on May 31, 2012

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# Greim Time Ch. 9 Motion and Machines

 energyability to do work
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#### Definitions

energy ability to do work
potential energy stored energy because of its position
kinetic energy energy due to motion
mechanical energy ability to make something move
motion change of an object's position
reference point used to determine whether an object has changed position
distance amount of space traveled from where an object starts to where it is at any given moment
speed rate
instantaneous speed speed at one particular moment
velocity distance an object moves over a given amount of time in a certain direction
acceleration change in velocity during a period of time
force must occur for acceleration to happen
friction force that keeps objects from moving against other objects
momentum mass and velocity of an object determine this
First law of motion an object at rest will stay at rest and an object in motion will stay in motion and in the same direction, unless the object is acted upon by an unbalanced force
inertia resistance to a change in motion
gravity the pull of one object on another
second law of motion force is equal to an object's mass and the acceleration of the object
third law of motion "law of action and reaction" , for every action, there is an equal and opposite reaction
work force acting on something as it moves a certain distance
newtons force measurement
joule measures work
machine any object that makes work easier
effort force force applied to a simple machine
resistance force force that works against the effort
lever any bar that turns on a point
fulcrum spot where the bar turns or pivots
first-class lever fulcrum is located between effort and resistance
second-class lever resistance between effort and fulcrum
third-class lever effort is between the resistance and fulcrum
pulley grooved wheel with a chain or rope wrapped in the groove
fixed pulley attached to something so it does not move
moveable pulley moves with the load or resistance
block and tackle combines multiple fixed and moveable pulleys
mechanical advantage decrease in effort that is needed to move an object
wheel and axle consists of wheel and rod, or axle, running through the wheel
inclined plane flat slanted surface such as ramp
wedge two inclined planes placed back to back
screw inclined plane wound around a cylinder or a cone
compound machine combines two or more simple machines to make work easier

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