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Physics Final
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Gravity
Terms in this set (47)
tetra
T
10^12
giga
G
10^9
mega
M
10^6
kilo
k
10^3
hecto
h
10^2
deka
da
10^1
deci
d
10^-1
centi
c
10^-2
milli
m
10^-3
micro
10^-6
nano
n
10^-9
pico
p
10^-12
femto
f
10^-15
vector quantity
magnitude and direction (NESW)
scalar quantity
magnitude. quantity described with number only
speed is...
the magnitude of velocity
average speed
v=d/t
instantaneous velocity
indicates how fast the car moves and the direction of the motion at each instant of time
instantaneous speed
magnitude of the instantaneous velocity
average acceleration
a=v/t
displacement
change in direction. vector drawn from the initial position to the final
SI units
meter(m), kilogram(kg), second(s)
What happens to the X component in Projectile Motion
X does not change. constant.
v=at here
What happens to the Y component in Projectile Motion
Y is treated as a free-fall
y=1/2gt^2
average velocity
change in distance/change in time
noncontact force
Fn, the normal force, is a noncontact force as is Fg the force of gravity
contact force
friction (Ff) and static (Fs)
Newton's First Law of Motion
An object continues in a state of rest or in a state of motion at a constant velocity (constant speed in a constant direction), unless compelled to change that state by a net force
Definition of Inertia and Mass
Inertia is the natural tendency of an object to remain at rest or in motion at a constant velocity. the mass of an object is a quantitative measure of inertia. measured in KG
Newton's second law of motion
a=F/m
F=ma
Newton's third law of motion
Whenever one body exerts a force on a second body, the second body exerts a force equal in magnitude but opposite in direction to the first body
Newton's Law of Universal Gravitation
F=Gm1m2/r^2
Weight is equal to
mg
w=mg=m(9.8)
weight can be measured in Newtons
Fstatic=
Fs=ukFn
equation for Fnet
Fnet=winner-loser
definition of equilibrium
an object is in equilibrium when it has zero acceleration
definition of uniform circular motion
Uniform circular motion is the motion of an object traveling at a constant (uniform) speed on a circular path
centripetal acceleration
Ac=v^2/r
centripetal force (Fc)
Fc=(mv^2)/r
if a stone is thrown from the top of a cliff is it at equilibrium?
no
an object is at equilibrium if
a) two perpendicular forces act on the object
a person has a choice of either pushing or pulling a sled at a constant velocity... if the angle is the same in both cases, does it require less force to push or to pull?
less force to pull
if a smooth or "frictionless"
uk=0
a stack of books whose true weight is 165N is placed on a scale in an elevator. The scale reads 165N. From this info alone, can you tell whether the elevator is moving with a constant velocity of 2m/s down or constant velocity of 2m/s up or if it's at rest?
nope
if two people on ice skates of different weight/height push off of one another...
each experiences a pushing force that has the same magnitude.
each experiences an acceleration that has a different magnitude.
If the net external force acting on an object is zero. what does this mean?
the object is either a) stationary or b)traveling with a constant velocity
If two or more forces are applied to an object simultaneously, does that mean it MUST accelerate?
NO. two forces could act oppositely on each other, cancelling each other out and making the total Net Force 0.
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