# Shared Flashcard Set

## Details

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

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 - standardslength, time, massPrefix Notationnano -- 10^-9micro -- 10^-6milli -- 10^-3centi -- 10^-2deka -- 10kilo -- 10^3mega -- 10^6giga -- 10^9tera -- 10^12
Term
 OHEC
Definition
 scientific methodObservation, 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
Definition
 inverse -- y=k/x -- k=xyquadratic -- y=kx^2 -- k= y/x^2linear -- y=kx -- k= y/x
Term
 "k" = ?
Definition
 k = slopechange in y/ change in xy2-y1/x2-x1--do not use data points
Term
 distance, time, speed
Definition
 change in x -- xf-xi -- distancechange in t -- tf-ti -- timespeed: 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 + directionvelocity, acceleration, force
Term
 scalar quantities
Definition
 you only need to specify magnitude
Term
 trig -- sin, cos, tan
Definition
 sin@ = side opps/ hypotenusecos@ = side adj/ hypotenusetan@ = 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 = maacc. 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 = mtension = w + maL - w = ma
Term
 Ms,MkFf = ?
Definition
 Ms -- static coefficientMk -- kinetic coefficientm = Ff/ NFf = u(nu)N
Term
 apparent weight
Definition
 m2>m1m2g - T = m2aT - m1g = m1am2g - m1g = m2 + m1aa = (m2 - m1) g/ m2 + m1
Term
 T = m1g + m1a
Definition
Term
 Equilibrium
Definition
 E(sigma) Fx = 0 E(sigma) Fy = 0-T1cos@ + T2cos@ = 0T2 = T1-T1sin@ + T2sin@ = 02Tsin@ = 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 velocityThe 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
 Accentripetal acceleration formula
Definition
 Ac = 4pir/T^2
Term
 FcCentripetal 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 ellipses2nd law -- a law from the planet to the sun sweeps out equal areas in equal times
Term
 3rd law
Definition
 t^2 = kRave^3k = t^2/ Rave^3 = 1y^2/ 1a.u.^3F = G(m1m2/R^2)G = 6.67x10^-11
Term
 Finding "g" on another planet
Definition
 mg = GMp/ Rp^2
Term
 Speed
Definition