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educated guess using what you know and what youve observed
hypothesis

amount of space occupied by an object
volume

push or pull that one body exerts on another
force

force that opesses motion between two touching surfaces
friction

states that any two masses exerts an attractive force on each other, the amount of which depends on the mass of the two objects and the distance between them
law of gravitation

organized procedure for testing a hypothesis that tests the effect of one thing on another under controlled conditions
experiment

distance an object travels per unit of time
speed

sum of the forces that are acting on an object
net force

acceleration of an object toward the center of a curved or circular path
centripetal acceleration

speed of an object at a given point in time, which is constant for an object moving at a constant speed and is different at each point in time for an object that is slowing down or speeding up
instantaneous spead

factor that can cause a change in the results of an experiment
variable

describes the speed and direction of a moving object
velocity

forces on a body that are equal in size and opposite in direction and do not change the motion of the body
balanced force

a force directed toward the center of a cirlce for an object moving in a circular motion
centripetal force

property that a moving object has because of its mass and velocity
momentum

a variable that does not change, when other variables change in an experiment
constant

rate of change of velocity, which occurs when an object speeds up, slows down, or changes direction
acceleration

resistance of an object to a change in its motion
inertia

gravitional force exerted on an object by earth
weight

total distanc that an object travels divided by the total time it takes to travel that distance
average speed



celios to kelvin
 c>k
 celios plus 273= kelvin


momentum
 p=mv
 momentum= mass x velocity

speed
 s= d/t
 speed= distance/time

acceleration
 a= (VfVi)/t
 acceleration= (final velocityinitial velocity)/time

velocity
 v= p/m
 velocity= momentum/mass

mass
 m= p/v
 mass= momentum/velocity

newton's 1st law of motion
 object moving at a constant velocity keeps moving at that velocity until a net force acts on it
 if npo forces are acting on a moving object, it continues to move

newton's 2nd law of motion
 all the forces added together is the net force
 net force acting on an object causes the object to accelerate in the direction of thr net force

newton's third law of motion
 when one object exerts a force on a second object, the second object exerts a force of the first that is equal in size and opposite in direction.
 every action has a seperate and opposite reaction