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Physics Midterm
Terms? Laws? Formulas?
55
Physics
01/10/2009

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Term
What is physics?
Definition
A science that studies the natural world.
Term
Mechanics
Definition
motion, energy + work, newton's law, harmonic motion
Term
Measurements
Definition
system international - standards
length, time, mass

Prefix Notation
nano -- 10^-9
micro -- 10^-6
milli -- 10^-3
centi -- 10^-2
deka -- 10
kilo -- 10^3
mega -- 10^6
giga -- 10^9
tera -- 10^12
Term
OHEC
Definition
scientific method
Observation, Hypothesis, Experiment, Conclusion
Term
Scientific Notation
Definition
shorthand form when working with big or small numbers
Term
interpolation
Definition
predicting a value within the range of the data
Term
extropolation
Definition
predicting a value outside the range of data
Term
"k"
inverse, quadratic, linear
Definition
inverse -- y=k/x -- k=xy
quadratic -- y=kx^2 -- k= y/x^2
linear -- y=kx -- k= y/x
Term
"k" = ?
Definition
k = slope
change in y/ change in x
y2-y1/x2-x1
--do not use data points
Term
distance, time, speed
Definition
change in x -- xf-xi -- distance
change in t -- tf-ti -- time
speed: change in x/ change in t
Term
What is acceleration?
Definition
change in velocity(time)
Term
distance = ?
Definition
d = vt
Term
What is free fall?
Definition
gravity.
Term
a = g = ?
Definition
9.8 m/s^2
Term
x = ?
Definition
1/2gt^2
Term
vector quantity
Definition
specify magnitude + direction
velocity, acceleration, force
Term
scalar quantities
Definition
you only need to specify magnitude
Term
trig -- sin, cos, tan
Definition
sin@ = side opps/ hypotenuse
cos@ = side adj/ hypotenuse
tan@ = side opps/ side adj
Term
law of cos
Definition
c^2 = a^2 + b^2 - 2ab(cos@c)
Term
law of sins
Definition
sin@A/A = sin@B/B = sin@C/C
Term
kinematics
Definition
study of motion
Term
what causes motion?
Definition
force -- push or pull
Term
unit of force
Definition
Newton (N)
Term
Newton's 1st Law
Definition
An object at rest remains at rest, an object in motion continues in motion, unless acted on by an outside force
Term
Inertia
Definition
property described by 1st law
Term
Mass
Definition
characterizes inertia -- quantity of matter (kg)
Term
W = ?
Definition
W(weight (N)) =(mass (kg))g(9.8 m/s^2)
Term
F = ?
Definition
F = ma
acc. is directly porportional to force/ inversly porportional to mass
Term
Vf = ?
Definition
Vf = at + Vi
Term
friction
Definition
oppose motion when objects are in contact
Term
spring
Definition
restoring form -- brings back to equillibrium back to where we started
Term
tension
Definition
pull out
Term
compression
Definition
push in
Term
thrust
Definition
go against gravity
Term
weight
Definition
gravity
Term
Free Body Diagram
Definition
represents forces that act on an object
Term
Equal Forces
Definition
Equillibrium -- sum of the forces add to zero
Term
Tension and weight formula
Definition
tension - weight = m
tension = w + ma
L - w = ma
Term
Ms,Mk
Ff = ?
Definition
Ms -- static coefficient
Mk -- kinetic coefficient
m = Ff/ N
Ff = u(nu)N
Term
apparent weight
Definition
m2>m1
m2g - T = m2a
T - m1g = m1a

m2g - m1g = m2 + m1a

a = (m2 - m1) g/ m2 + m1
Term
T = m1g + m1a
Definition
Term
Equilibrium
Definition
E(sigma) Fx = 0 E(sigma) Fy = 0
-T1cos@ + T2cos@ = 0
T2 = T1
-T1sin@ + T2sin@ = 0
2Tsin@ = W?

smaller @ = bigger tension
Term
constant speed
Definition
Ff = F||
Term
What is projectile?
Definition
An object that is effected by gravity after it is given an initial velocity

The horizontal motion of a projectile is independent of the vertical motion
Term
Horizontal Motion
Definition
X = VxT
Term
a = Vf-Vi/ change in T
Definition
Term
centripetal acceleration
Definition
when acceleration is directed to the center
Term
period
Definition
time for 1 revolution
Term
Ac
centripetal acceleration formula
Definition
Ac = 4pir/T^2
Term
Fc
Centripetal Force
Definition
mv^2/R = Fc = (4pi^2R/T^2)m
Term
Johannes Kepler
Definition
had 3 laws of planetary motion
Term
Kepler's 3 laws
Definition
1st law -- paths of planets are ellipses
2nd law -- a law from the planet to the sun sweeps out equal areas in equal times
Term
3rd law
Definition
t^2 = kRave^3

k = t^2/ Rave^3 = 1y^2/ 1a.u.^3

F = G(m1m2/R^2)
G = 6.67x10^-11
Term
Finding "g" on another planet
Definition
mg = GMp/ Rp^2
Term
Speed
Definition
v = rad(GMp/Ro)