## Physics

##### Created by:

CuddlesDaKat  on October 10, 2012

Physics review

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# Physics

 2 types of observationsQuantitative-scientists use this observation the most; observations with numbers Qualitative- What the observation look, smell, taste, touch, sounds, and feels
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#### Definitions

2 types of observations Quantitative-scientists use this observation the most; observations with numbers

Qualitative- What the observation look, smell, taste, touch, sounds, and feels
2.54 centimeters 1 inch
30 centimeters 1 foot
1 kilometer 1.06 quarts
1 kilogram 2.2 pounds
1 mile 1760 yard
3 foot 1 yard
12 in 1 foot
1 liter is... 1/1000 of a meter
A ___ is about the same size as the end of your pinkie finger cm3
Velocity formula velocity= distance/time
Speed formula speed=distance/time
how many significant figures are in 38.15 cm? 4
how many significant figures are in 5.6 ft? 2
how many significant figures are in 0.008 mm? 1
how many significant figures are in 0.01556 oz? 3
how many significant figures are in 50.8 mm? 3
how many significant figures are in 2001 min? 4
how many significant figures are in 25000 in? 2
how many significant figures are in 200 yr? 1
formula for Acceleration a=v/t
as speed increases, time increases constant acceleration
as speed decreases, time increases constant negative acceleration
All non-zero numbers ARE ____. The number 33.2 has THREE ___ figures because off of the digits present are non-zero significant
The quality of being close together precision
how close the measured value is to the true or accepted standard accuracy
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion will stay in motion with a constant speed and direction unless acted on by an unbalanced force. Newton's First Law of Motion
The acceleration of an object is equal to the force you apply divided by the mass of the object Newton's Second Law of Motion
Newtons unit of force (N)
For every action, there is an equal and opposite reaction. Newton's Third Law of Motion
An object at rest likes to remain at rest inertia
direct proportion force and mass
inverse proportion mass and acceleration; bigger is slower
speed and mass are directly proportional
Condition of zero acceleration Equilibrium
Action that can change motion Force
a=v2-v1/t or a=vf-vi/t acceleration
kilo hecto deca deci centi milli 1000 100 10 10 .1 .01 .001
Which country started the Metric System France
What powers is the metric system based on? 10's
formula for density d=m/v
formula for volume v=lwh
Rate of change in velocity Acceleration
distance covered in a period of time Speed
Acceleration always have ___ time units 2
eggs on a sheet small force take long time tF
g=acceleration due to gravity has numerical value: ____ 9.8m/s2
Why were the crash of the 2 cars different? One of the cars decreased their speed; Ft if it can stop at a longer time, smaller force, shorter time stronger force.
a=f/m Newton's 2nd law
acceleration due to gravity 9.8m/s2
distance travled over time average speed
force equally opposed by another force in the opposite direction, meaning that they cancel out each other so the object does not move. balanced forces
large cup with a beak; can't measure accurately beaker
deep thinking brainstrom
compare work to; dominate control
Front of the car where the it "crumples" upon impact crumple zone
opposite of acceleration;negative acceleration ; slowing down deceleration
measure of mass of a substance per unit volume. Density
dependent or responding variable y axis
direct proportion one goes up, the other goes up
how much ground an object has covered during motion distance
f=ma changing momentum with an impulse; force= mass times acceleration
proven theories; the truth fact
friction in water fluid friction
glass tube that measures accurately graduated cylinder
measure of mass equal to one thousandth of a kilometer gram
force that attracts objects to the earth; measured by acceleration gravity
education guess hypothesis
I=f delta t impulse momentum theorem; A force that is applied over a time interval to an object will equal to its mass x its change in velocity
force X time =___ impulse
object at rest will stay at rest; object in motion will stay in motion inertia
assumption inference
speedometer speed instantaneous speed
one up one down inverse proportion
kinetic energy k=1/2 m v2
energy of motion kinetic energy
Whatever you put in you get out; y+x=a=b Law of conservation of momentum
momentum is inertia in motion; most valuable player m=vp
inertia in motion: p=mv momentum
amount of force to accelerate. 1 kg of mass= 1 meter per sec per sec newton
stored energy potential energy
What makes you know that you are moving reference point
wheels; go faster rolling friction
slide on table top; friction that is still static friction
At a time where force of air is pushing at you while falling; not accelerating terminal velocity
vector line with direction, length tells amount of momentum
g= acceleration due to gravity, has numerical value: ___ 9.8 m/s2

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