Physics

Physics

Administered May 2013

RELEASED

Copyright ? 2013, Texas Education Agency. All rights reserved. Reproduction of all or portions of this work is prohibited without express written permission from the Texas Education Agency.

STAAR PHYSICS RefeRenCe MATeRIAlS

STAARTM

State of Texas Assessments of Academic Readiness

fORCe AnD MOTIOn

displacement

Average velocity = change in time

final velocity - initial velocity

Acceleration =

change in time

(final velocity)2 - (initial velocity)2

Acceleration =

2(displacement)

( )( ) ( ) Displacement =

initial velocity

change in time

+

1 2

(acceleration)

change in time

2

Centripetal acceleration = (tangential velocity)2

radius

Net force = (mass)(acceleration)

Work = (force)(distance)

v

avg

=

d t

a

=

v

f

-

v

i

t

a

=

v2

f

-

v2

i

2d

d

=

vit

+

1 at2 2

v2

a

c

=

t

r

F

net

=

ma

W = Fd

Torque = (force)(lever arm)

Power

=

work time

Pythagorean theorem

GRAVITATIOnAl, eleCTRICAl, AnD MAGneTIC fORCeS

( )( ) Force of gravitational

attraction between =

( )( ( ) ) 2 objects

universal gravitation

constant

mass of mass of 1st object 2nd object

distance between 2 centers of objects

( )( ( )( ) ) Force between 2 charged =

Coulomb's constant

particles

charge of charge of 1st particle 2nd particle

(distance between particles)2

= Fr

P

=

W t

a2 + b2 = c2

( )mm

F

g

=

G

12

d2

( )q q

F

electric

=

k

C

12

d2

Electrical power = (voltage)(current)

voltage

Current = resistance

Equivalent resistance for resistors in series

Equivalent resistance for resistors in parallel

P = VI

I=V R

R

=

R

1

+

R

2

+

R

3

+

...

1 = 1 + 1 + 1 + ...

RRR R

1

2

3

STAAR PHYSICS RefeRenCe MATeRIAlS

eneRGY AnD MOMenTUM

Kinetic

energy

=

1 2

(mass)(vel

ocity)

2

( ) Gravitational potential energy

=

(mass)

acceleration due to gravity

(height)

( )( ) Elastic

potential

energy

=

1 2

spring constant

distance stretched 2 or compressed

Energy = (power)(time)

Work = change in kinetic energy

Mechanical energy = kinetic energy + potential energy

Law of conservation of energy

Momentum = (mass)(velocity)

Impulse = (force)(change in time) = (mass)(change in velocity)

Law of conservation of momentum

( )( ) Heat

gained

or

lost

=

(mass)

specific heat

change in temperature

WAVeS AnD lIGHT

Velocity = (frequency)(wavelength)

1

=

1

+

1

Focal length distance to image distance to object

Energy = (mass)(speed of light)2

KE = 1 mv 2 2

PE

g

=

mgh

PE

elastic

=

1 kx2 2

E = Pt

W = KE

ME = KE + PE

KE

i

+

PE

i

=

KE

f

+

PE

f

p = mv

J = Ft = mv

mv

1 1i

+

mv

2 2i

=

mv

1 1f

+

mv

2 2f

Q = mcpT

v = f

111

=+

f dd

i

o

E = mc2

STAAR PHYSICS RefeRenCe MATeRIAlS

COnSTAnTS AnD COnVeRSIOnS

c

=

speed

of

light

=

3.00 ? 108

m s

m g = acceleration due to gravity = 9.8

s2

G = universal gravitation constant = 6.67 ? 10-11 N m2 kg2

kc

=

Coulomb's constant = 8.99 ? 109

N m2

2

C

m

E

=

mass

of

Earth

=

5.97 ? 1024

kg

r

E

=

radius

of

Earth

=

6.37 ? 106

m

kg m newton (N) =

s2

joule (J) = N m

watt (W)

=

J s

=

Nm s

cycle hertz (Hz) = s

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