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educated guess using what you know and what you observe
hypothesis

amount of space occupied by an object
volume

push or pull that one body exerts on another
force

force that opposes motion between two touching surfaces
friction

states that any two masses exert 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

distancce 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
centipetal acceleration

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

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 directionand do not change the motion of the body
balanced force

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

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

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

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

resistance of an object to a change in its motion
inertia

gravitation force exerted on an object by earth
weight

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



celsius to kelvin
celsius + 273

kelvin to celsius
K  273

formula for momentum
p= mv

formula for velocity
v= p / m

formula for speed
s= d / t

formula for acceleration
a= (Vf  Vi) / t


states that any net force acting on an object causes the object to accelerate in the direction of the net force
newton's second law of motion

describes actionreaction pairs  to every action force there is an equal an oppostie reaction force
newton's third law of motion

an object moving at a constant velocity keeps moving at that velocity unless a net force acts on it
newton' s first law of motion

what is the difference between distance and displacement
distance is how far something has traveled and displacemant is how far it is from its starting point

