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# vocab

Referance point a point at which other points refer to
motion an object's change in position relative to the referance point
speed the distance traveled by an object divided by the time it took the travel that distance.
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time
centripal acceleration acceleration that occurs in a circular motion
force a push or pull
Newton the SI unit for force
net force the combination of all of the forces acting on an object
balanced force when the net force on an object is 0 N
unbalanced force when the net force on an object in not 0 N
friction a force that opposes motion between two surfaces that are in contact
kinetic energy friction between moving surfaces
static friction when a force is applied to an object does not cause the object to move
lubricants substances that are applied to surfaces to reduce the friction between the surfaces
gravity a force of attraction between objects that is due to their masses.
weight a measure of the gravitational force on an object
mass the amount of matter in an object... DOESNT CHANGE
terminal velocity the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
air resistance the force that opposes the motion of objects through air
free fall the motion of a body when only the force of gravity is acting on the body
projectile motion the curved path an objects follows when it is thrown near the center of the earth
inertia the tendancy of all objects to resist any change in motion
momentum how easy or hard it is to stop
work when a force causes an object to move in the direction of the force
power the rate at which work is done or energy is transformed
machine a device that makes work easier by changing the size or direction of a force
work input the work you do on a machine
work output the work done by the machine
input force the force i apply
output force the force the machine applies
mechanical advantage the number of times the machine multiplies force
mechanical efficiency a comparison of a machine's work output with the work input
ideal machine a machine that is 100% efficient
energy the ability to do work
potential energy the energy an object has because of it position
mechanical energy total energy of motion and position of an object
friction a forces that opposes motion between two surfaces that are touching