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# Stack #1876603

### Forces and Motion and Simple Machines

TermDefinition
motion an objects change in position relative to a reference point
speed the distance traveled divided by the time interval during which the motion occured
velocity the speed of an object in a particular direction
Acceleration the rate at which changes over time an object accelerates if its speed direction or both change
force a push or pull exerted on an object in order to change the size and direction
Newton the SI unit for force
net force the combination of all of the forces acting on an object
friction a force that opposes motion between 2 surfaces that are in contact
gravity a force of attraction between objects that is due to their masses
weight a measure of the gravitational force exerted on an object its value can change with the location of the object in the universe
mass a measure of the amount of matter in an object
free fall the motion of a body when only the force of gravity is acting on the body
work the transfer of energy to tan object by using force that causes the object to move in the direction of the force
joule the unit used to express energy equivalent the the amount of work done by a force 1 N acting through a distance of 1m in the direction of the force(symbol, J)
watt the unit used to express power equivalent to joules per second (symbol, W)
machine a device that helps do work by either overcoming a force or changing the direction of the applied force
work in put the work done on a machine the product of the input force and the distance through which the force is exerted
work out put the work done by a machine the product of the output force and the distance through which the force is exerted
mechanical advantage a number that tells how many times a machine multiplies force
inertia the tendency of an object to resist being moved or if the object is moving to resist a change in speed or direction until an outside force acts on the objects
Created by: wentay37