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30 Cards in this Set

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Motion
occurs when an object changes its position relative to its surroundings.
distance
an object travels is the space between two points.
frame of reference
motion is observed and meassured any set of point,lines,or planes from which coordinates can be measured
speed
of an object is the distance the object travels in a given time
average speed
s=d/t
s=100m/20s
s=5m/s
instantaneous speed
the speed of an object at a particular instant
velocity
is speed in a particular direction
acceleration
the rate at which the velocity of an object changes
a=cv/t=Fv-iv/t
a=15m/s-0m/s/8s
a=1.9m/s2
inertia
is the tendency of an object to resist any change in motion
net force
is the sum of the force acting on an object
net force=mass x acceleration
f=m x a
f=1n
acceleration due to gravity
in the absence of air resistance, however, all freely falling objects have the same acceleration
FREE FALL
WHEN gravity is the only force acting on a falling object
weightless
freely falling object
momentum
is = to an object's mass multipled by its velocity
p=m x v
p=___kg x m/s
projectile motion
is the motion of an object thats move under the influence of gravity alone
trajectory
the curved path a projectile follows
uniform circular motion
refers to motion with constant speead around a circle
centripetal force
force that causes an object to move in a circle
work
IS DONE WHEN WHEN A FORCE MOVES AN OBJECT OVER A DISTANCE
W+ F X D
joule
one j equals a force of 1n moving an object a distance of i m. a joule is = to n x m
w=f x d
w=___j
energy
the ability to do work
potential energy
stored energy
gravitational potential energy
potentia energy due to an object's positions relative to the ground
kinetic energy
is the energy of motion
kinetic energyy = 1/2 mass x speed2

ke=1/2mv2
laws of conservation of energy
that energy can be changed from one form to another, the total amount stay the same
power
is the rate at which work is done
power = work/time
p=w/t
p=___w
watts
a watt is equal to a joule per second (j/s)
machine
any tool that help to do work
simple machine
is one that does work in one movement
lever
is a rod or bar that pivits around a point