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Physics 1 Final Cheat Sheet (DRAFT) by

Physics 1 fall final

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Velocity

Velocity
How fast and in what direction an object is going.
Formula (average velocity)
change in position/ time

Practice test things to remember

t=
d/v
when force isnt

Unit 3 vocab

Drag Force
force esherted on an object in opposition as object moves through fluid (including air)
As velocity increases, drag force
increases
Terminal Velocity
When drag force = force of gravity
Intera­ction pair
two forces in opposite direction have = magnitude
Tension
Force exherted by a string or rope
Normal force
Force surface exherts to keep objects from passing through
Resultant
Sum of adding vectors

Defini­tions

Inertia
tendancy of an object to resist change
Equili­brium
when net force is zero

Force

Definition
A push or pull exherted on an object
Equation
F=ma
One unit
kgm/s^2
Net Force
vector sum of all forces on an object
Fappearant
= ma+Fg

Accele­ration

Accele­ration
The rate at which velocity changes
Formula for accele­ration
Change in velocity/ time
Formula for change in velocity
V2-V1
Speeding Up
When velocity and accele­ration are in same direction
Slowing down
When velocity and accele­ration are in opposite directions
Accele­rating at a constant speed
A car can be accele­rating at a constant speed around a corner

Unit 1 Vocab

Physics
A branch of science involving the physical world: energy, matter and how they relate
Hypothesis
An educated guess
Model
Repres­ent­ation of a natural phenomena
Scientific Law
A rule of nature
Scientific Theory
A well supported and test explan­ation of a natural phenomea
Precision
The smallest division marked on an instrument
Uncert­ainty
One half the smallest division marked on an instrument

Diagrams of Motion

Motion Diagram
Shows subject at equal time intervals along path of motion
Particle Diagram
Subject is repres­ented by particles at equal time intervals (simpl­ified)

Types of Motion

Linear
Straight Line
Circular
Circle
Projectile
arch

Sig Fig Calcul­ations

Multip­lic­ati­on/­Div­ision
Answer has same number of sig figs as least number in problem
Additi­on/­Sub­tra­ction
Answer is a precise as least precise number in the problem

Sig Figs

Definition
The valid digits in a number
Sig figs
All nonzeros
Sig figs
All sandwiched zeros
Sig figs
All following zeros after a decimal
 

Measur­ements

Vectors
Numbers with magnitude and direction
Vector quantities
Velocity, accele­ration, force, momentum, displa­cement
Scalar
Numbers without direction
Scalar quantities
speed, distance, temper­ature, mass

Graphing Motion

Position Time Graph
Shows how position of an object varies with time.
Slope of Position Time
Shows velocity
Velocity Time graph
Shows how velocity varies with time
Area under curve
Shows distance

Speed

Speed
How fast an object is going
Average speed
d/t
Instaneous speed
the speed at a specific instant in time
-Speed­ometer
speed during 1 tire revolution
-Radar gun
speed while a car travels 1 inch
Scalar
Only has number value

Displa­cement

Displa­cement
Difference in position
Formula
change in x= x2-x1

Graphing Relati­onships

Linear
Straight line, y=mx+b
Quadratic
Palarbora, one variable depends on square of another, y=ax^2­+bx+c backwards C
Inverse
Hyperbola, y=a/x, one variable depends on inverse of another, fowards C
Radical
y=a radical x upside down u that doesn't connect

Percent error

Formula
experi­mental - actual /actual x100

Force

System
object the force is exherted on
External world
everything around the object that exherts force on the object
Contact force
Exherts a force on system by touching the object
Field forces
exherts a force on the system without touching the object
Free body diagram
physical model that represents the forces acting on a system
Resultant force
Single force with same effect as 2 individual forces added together

Newton's Laws

1st
object at rest will stay at rest and in motion will stay in motion unless acted on by a net force
2nd
Accele­ration of an object is sum of forces acting on it divided by the mass of the object
3rd
Forces come in pairs

Scientific Notation

Moving decimal left
Positive exponent
Moving decimal right
Negative exponent
Uncert­ainty
The exponent of 10 minus number of following zeros in the problem

Solving vectors

Adding methods
Tail to tip or parell­elogram
If right triangle
pythag­oreom theorum
If vectors make right angle, angle of resultant is
inverse tangent B/A

Friction

Kinetic friction
Acts on moving objects
Static friction
Acts on stationary objects