User talk:3footmonkey

Physics notes
[9/5] Physics is the study of energy:
 * motion: speed, velocity
 * forces: gravity, friction
 * waves: sound, light
 * electricity and magnetism
 * atomic and nuclear physics

Galileeo Galilei- father of physics

Significant Figures (SIG FIGS)
 * account for the degree of uncertainly

Rules: 1. NONZERO Integer- always count 2. ZERO: 3 classes a.leading zeros- Never count Ex. 0.00123 = 3 SIG FIGS

b.Captive zeros- Always count Ex. 1.0012 = 5 SIG FIGS

c.Trailing zero- depends on the decimal Ex. 1000 = 1 SIG FIGS 1000. = 4 SIG FIGS 3. Exact Numbers- Assumes umlimited -arise to definitions - scientific notation

[9/6] 1 meter = 3.281 feet

[9/10] -v(avg) = Change of x/ change of t -a(avg) = change of v/ change of t

"Constant Acceleration" -v = v(0) + at -x = x(0) + v(0)t + 1/2at^2 -v^2 = v(0)^2 + 2a(x - x(0))

gravity(g) = 9.8 m/s^2

"Free Fall"
 * v = v(0) - gt
 * y = y(0) + v(0)t - 1/2gt^2
 * V^2 = v(0)2 - 2g(y - y(0))

[9/19] d = 1/2at^2 v =at

[9/30] change of x1 = v0, 1change of t + (1/2)a * change of t^2

[10/1] "FREE-FALL" (go back to golfgizmo for more info)
 * vx = v0 • cos(degree)
 * vy = v0 • sin(degree)
 * vy = vy(initial) – gt
 * d = vx • t (distance = velocity × time)


 * h = 1/2 gt^2,  h= h0 + 1/2 gt^2

[10/5] "Vectors"
 * d^2 =change of x^2+change of y^2
 * change of V = change of y / change of time

[10/6] On the moon, Gravity = 1.62 m/s^2

[10/7]
 * (change)y = d(cos degree)
 * d = v (change)t
 * (change)y = v (change)t (cos degree)

[10/22] Law of Force and Acceleration (newton's second law of motion)

1. A force on an object will cause it to accelerate

2.This acceleration is directly proportional to the force

3.This acceleration is inversely proportional to the mass


 * F = ma (force = mass x acceleration)

->       Newton's Law: Isaac Newton first understood the relation between a force and the acceleration it causes.

->       Newton's first law: if no force acts on a body, the body's velocity cannot change; that is, the body cannot accelerate.

(Means body at rest, stays at rest. And body travel a constantly velocity, will still travel in a constantly velocity) EXCEPTION: when Velocity is affect by net force.

->       Newton's Second Law: the net force on a body is equal to the product of the body's mass and its acceleration.

"Tension" Intermolecular force in an object (Ex.String) It's purpose is to maintain Integrity Cannot push with a string (ONLY PULL)

EXAMPLE: "swinging a rock" (Tension on the bottom) Acceleration toward the center
 * a = v^2/r

T - mg = m(v^2/r) T = mg + m(v^2/r)

(Tension on the Top) Acceleration toward the center

T + mg = m(v^2/r) T = -mg + m(v^2/r) ;

'v' must be greater than square root of (r * g)

Because Tension cannot be negative. If it is negative, then the string is pushing and that is impossible. TENSION CAN'T BE PUSH, ONLY PULL

[10/23] T= Tension W = mg (mass * gravity) F = ma (mass * acceleration)

(Sigma)F = W + F (or known as F = mg + N)