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| A science that studies the natural world. |
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| motion, energy + work, newton's law, harmonic motion |
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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 |
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scientific method
Observation, Hypothesis, Experiment, Conclusion |
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| shorthand form when working with big or small numbers |
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| predicting a value within the range of the data |
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| predicting a value outside the range of data |
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"k"
inverse, quadratic, linear |
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inverse -- y=k/x -- k=xy
quadratic -- y=kx^2 -- k= y/x^2
linear -- y=kx -- k= y/x |
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k = slope
change in y/ change in x
y2-y1/x2-x1
--do not use data points |
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change in x -- xf-xi -- distance
change in t -- tf-ti -- time
speed: change in x/ change in t |
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specify magnitude + direction
velocity, acceleration, force |
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| you only need to specify magnitude |
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sin@ = side opps/ hypotenuse
cos@ = side adj/ hypotenuse
tan@ = side opps/ side adj |
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| c^2 = a^2 + b^2 - 2ab(cos@c) |
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| sin@A/A = sin@B/B = sin@C/C |
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| An object at rest remains at rest, an object in motion continues in motion, unless acted on by an outside force |
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| property described by 1st law |
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| characterizes inertia -- quantity of matter (kg) |
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| W(weight (N)) =(mass (kg))g(9.8 m/s^2) |
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F = ma
acc. is directly porportional to force/ inversly porportional to mass |
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| oppose motion when objects are in contact |
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| restoring form -- brings back to equillibrium back to where we started |
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| represents forces that act on an object |
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| Equillibrium -- sum of the forces add to zero |
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| Tension and weight formula |
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tension - weight = m
tension = w + ma
L - w = ma |
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Ms -- static coefficient
Mk -- kinetic coefficient
m = Ff/ N
Ff = u(nu)N |
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m2>m1
m2g - T = m2a
T - m1g = m1a
m2g - m1g = m2 + m1a
a = (m2 - m1) g/ m2 + m1 |
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E(sigma) Fx = 0 E(sigma) Fy = 0
-T1cos@ + T2cos@ = 0
T2 = T1
-T1sin@ + T2sin@ = 0
2Tsin@ = W?
smaller @ = bigger tension |
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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 |
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| when acceleration is directed to the center |
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Ac
centripetal acceleration formula |
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| mv^2/R = Fc = (4pi^2R/T^2)m |
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| had 3 laws of planetary motion |
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1st law -- paths of planets are ellipses
2nd law -- a law from the planet to the sun sweeps out equal areas in equal times |
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t^2 = kRave^3
k = t^2/ Rave^3 = 1y^2/ 1a.u.^3
F = G(m1m2/R^2)
G = 6.67x10^-11 |
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| Finding "g" on another planet |
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