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Gravity
A Study Guide for Physics
Terms in this set (63)
displacement
distance and direction of an object's change in position from the starting point
distance
how far an object moves
balanced forces
forces that are equal in size and opposite in direction; they do not move an object and the net force is equal to zero.
average speed
total distance divided by total time
instantaneous speed
speed at a given point in time
unbalanced forces
forces that are unequal in size and the direction is the same; they cause an object to move
velocity - definition
the speed and direction of an object's motion (m/s)
velocity - symbol
v
acceleration - definition
The rate at which an object's velocity increases or decreases (m/s^2)
acceleration - symbol
a
time - definition
The duration of an event (i.e. The ball was in the air for 4 seconds)
time - symbol
t
seconds - definition
A unit of time
seconds - symbol
s
force - definition
A push or a pull on an object
force - symbol
F
Newton - definition
unit for force
Newton - symbol
N
Kilogram - definition
unit for mass
Kilogram - symbol
kg
Joule - definition
unit for energy
Joule - symbol
J
Power - definition
measure of energy in watts (w)
Power - symbol
P
Gravity
(physics) the force of attraction between all masses in the universe
Air Resistance
a type of friction that opposes the force of gravity
The Law of Conservation of Momentum
any time two or more objects interact they may exchange momentum but the total amount of momentum stays the same; momentum is conserved~p=m x v
Newton's 1st Law of Motion
an object in motion stays in motion and an object at rest stays at rest until a net force acts upon the object
Newton's 2nd Law of Motion
Force= mass x acceleration; the larger something is, the harder it is to move
Newton's 3rd Law of Motion
Forces always occur in pairs; the forces will always be equal and opposite
friction
a force that OPPOSES motion between two surfaces that are touching each other; it slows down the motion of objects
static friction
friction between two surfaces that are not moving past each other
sliding friction
friction that opposes motion between two surfaces sliding past one another
rolling friction
friction between a rolling object and surface it rolls on
Law of Gravitation
the law that states that the force of gravity depends on the mass and distance between the objects
Mass
the amount of matter in an object; stays the same no matter where you are
Weight
the force of gravity pulling on a body; changes as gravitational force changes
acceleration of gravity on Earth
-9.8 m/s^2
work
the transfer of energy that occurs when a force makes an object move in the direction of the applied force; measured in joules (lifting weights, moving a desk)
resistance - definition
an electrical device that resists the flow of electrical current; measured in Ohms
resistance - unit
Ohms
resistance - variable
R
voltage - definition
the difference in electrical charge between two points in a circuit; measured in volts
voltage - unit
volts
voltage - variable
V
current - definition
a flow of electricity through a conductor; measured in amperes
current - unit
amperes or amps
current - variable
I
Ohm's Law
I=V/R
Amps - variable
A
Charge - variable
Q
Equilibrium
when the net force on an object is zero
Potential energy
The energy that an object has the potential of putting out (i.e. an object higher in the air will have more potential energy because it has more space to accelerate) (mgh)
Kinetic energy
The energy an object is using in motion (i.e. a moving car has kinetic energy) ((1/2)mv²)
Change in x for two dimentional motion
x=x.+v.t+(.5at²)
Net Force equation
mass * acceleration
displacement equation
d=xf-xi
Power equation
IV
Work equation
force × distance
Vf=
Voy + at
change in X=
(change in V) x t
change in Y=
Vot + 1/2at^2
Vf^2=
Vo^2 + 2ax
;