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__speed__: a measure of how fast something is moving. The rate at which distance is covered (m/s)

__velocity__: speed in a given direction (m/s)

The acceleration due to gravity is a constant 9.8m/s^{2}downward (assuming it’s on the surface of the Earth) throughout the baseball’s journey. It’s velocity is ever changing but the acceleration is constant.
The acceleration due to gravity on the moon experienced by both the pen and the piece of paper is exactly the same and therefore they will reach the ground at exactly the same moment. If you tried this on Earth, the pen would most likely hit the ground first, but this is a result of greater air resistance experienced by the piece of paper not by a difference in the acceleration due to gravity. On the moon there is no atmosphere and therefore no air resistance explaining why both pen and paper reach the ground at the same time.

vectors

value and direction

scaler

fancy word for #

diff. btw distance and displacement

distance - change in position - go in a circle =0

displacement - how much you traveled - circle 2∏r

speed vs velocity vs acceleration

distance/t

displacement/t

** ***a*** **=Δ* v/*Δ

A baseball is thrown vertically in the air so that it returns to the ground exactly from where it was thrown. At what point during its motion does the baseball experience the lowest acceleration?

A baseball is thrown vertically in the air so that it returns to the ground exactly from where it was thrown. At what point during its motion does the baseball have the lowest speed (ignore air resistance)?

At the highest point of its motion

An astronaut simultaneously drops a piece of paper and a pen from the same height above the surface of the moon. Which hits the ground first?

Which of the following explains why the turns on a racecar track are banked curves (angled upward)?

To decrease the force of friction between the car and the track

bc if you look at the diagram the F_{n} will help out the F_{c }so that the friction is decrease bc the normal will help the centripetal

Projectile Motion- horizontal component of velocity

v *cos θ**constant *

at max height the vertical component of the velocity is _____

zero

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity

remains unchanged.

only the vertical changes and a = -9.8 at all pts of trajectory

Projectile Motion at top of trajectory

v_{y} = 0 at the top of the trajectory

v_{x} ≠ 0 at the top of the trajectory

v

a = -9.8m/s^2

if thrown from the ground w velocity v the velocity of obj just before impact will be ___

V

given r of curve

kg of car and v of the car find stat. coeff.

*F _{c} *=

*F _{f} = mgu*

*mgu= **mv*^{2}*/r*

*gu= **v*^{2}*/r*

150 g ball swung horiz in a circle with the readius 1 m if the ball makes 5 revolustions in a sec what is the F_{c }

d=vt

d=2πr

5rev= 1 sec

1rev =.2 sec

vt=2πr (find v)

a= v^{2}/r (find a)

F=ma

if given 2 T and asked about efficiency

e=1-Tc/Th

when given a springs Li and Lf and asked to find the E

E= .5(kA^{2})

A= amplitude

simple harmonic motion means

as the obj moves towards x=0 (minimum displacement, the force decreases and reaches zero. as the force reaches 0, so does the acceleration F=ma. however the obj will gain speed as it moves towards the equilibrium position. thus the speed is greatest at x=0; a=0

if a pipe open on both sides formula?

f=(nV)/2L

n= 1,2,3, (harmonic)

What is the formula for frequency of an open pipe?

f = nv/2L

Closed Pipe frequency formula

f=nv/4L

-odd integers only

-closed end always nodes

-open ends always antinodes

speed of a wave

v=fλ

frequency of a wave

f=(#cycles)/time

f=1/T

Frequency and Period for a mass on a spring

f = (1/2π)√(k/m)

T = 2π√(m/k)

period on a pendulum

T=2π √(1/g)

Pressure for static fluids equation

P=ρgh

Buoyant Force (Formula)

The upward force acting on a submerged object that is equivalent to the weight of the fluid displaced by the object.

F_{b} = ρ_{fluid}Vg = g x m_{displaced fluid} (weight)

V = volume of fluid displaced

m = mass of the displaced fluid

For an object that is submerged, F_{b} is equal to the pressure difference between the pressure at the top of the object and bottom of the object multiplied by the area of the surface of the bottom or top (pg 80)

F_{b} = ΔP x A

F

V = volume of fluid displaced

m = mass of the displaced fluid

For an object that is submerged, F

F

if 2 pistons with the radius and the F of one given

use pascal's F1/F2 = A1/A2

A1V1=A2V2

relates presure of 2 different vessels

and also tells you that the smaller the area the faster it is

pressure btw 2 places

P = ρgh so the deeper one

flow rate equation

Q=flow rate= AV=V/t

water leaves a hole v and Q (flow rate) given find diameter... equtions

A=πr^{2}

Q=Av

water sprout shoots water upwards w h and cross sectional A given find Vol. of water each min. EQUATIONS

PEgain=KElost Q=Av =volume/t

Changing Pipe Diameters equation

A1V1=A2V2

--it's conservative

A=πr^{2}

make sure the change the D to r

if the length of a pipe qudruples and the r triples what happens to the flow rate?

for ideal liquids the flow rate is independent of pipe lengths

Av=Av so the speed will decrease by a factor of 9 but the flow rate is constant

longitudinal wave such as a sound wave is one in which the particles move ____ to the direction of motion

parallel

sound generally moves fastest in ___ and slowest in ____

-solids

- gases

waves are readily formed on a stretched spring such a s slinky

sound wave doesn't travel in a vaccum

loudness or intensity level given by

dB=10log Io/I

60dB to 20dB is how much greater

dB=10log I_{o}/I

Io= 1×10^{-12} W/m2

so its 10^{4} greater

Area of a sphere

A = 4 π r^{2}

^{}

intensity equation

intensity = power / area

doppler effect for ___

light and sound

when the source emits light of a particular wavelength and moves towards you ____

frequency increases and the wavelength appears to decrease

as sound approaches you the pitch and wavelength

increases

decreases

sound source moves away

frequency (pitch) decreases and wavel. ↑

____ are always attractive and ____ can be repulsive or attractive

- gravitational force

- electrical force

___ cannot conduct heat or electricity to an appreciable extent

insulators

k, coulombs constant

9x10^{9 }Nm^{2}/C^{2}^{}

an object that acquires a + charge ___

has lost electrons

Relationship between force and distance

Hyperbola

F= (kq_{1}q_{2}) / r^{2}_{ }

electric Field equation

E= F / q [N/C]

E= V / d [V/m]

E = (kq) / r^{2}

V=voltage

d=distance

The electric field is what kind of quantity?

Vector

E strngth within a metal is ___

zero

About this deck

Author: Payal P.

Created: 2014-05-29

Updated: 2014-06-19

Size: 54 flashcards

Views: 10

Created: 2014-05-29

Updated: 2014-06-19

Size: 54 flashcards

Views: 10

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