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Stack #1876603
Forces and Motion and Simple Machines
Term | Definition |
---|---|
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 |