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
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 
V2V1 
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= x2x1 
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 
