Term

Definition
how closely the measurement agrees with the accepted value 


Term
Which digits are significant? 

Definition
any nonzero digits in a number any zeros between nonzero digits zeros appearing at the end of a number and to the right of the decimal point 


Term
Adding or subtracting with significant digits 

Definition
the result cannot be more precise than the least precise number being added or subtracted 


Term
Multiplying or dividing with significant digits 

Definition
the result should have the same number of significant digits as the “input” number with the fewest 


Term
The Difference between speed and velocity 

Definition
Velocity is a vector it has magnitude and direction Speed is a scaler it has magnitude but no direction 


Term

Definition
Acceleration = change in velocity (Δv) / change in time (Δt) Can be a change in speed or direction or both Acceleration = slope of a velocity time graph 


Term

Definition
Has magnitude and direction (vector) Use arrows to represent velocity () Velocity = change in displacement (Δd) / change in time (Δt) Velocity = Slope of a displacementtime graph Instantaneous velocity: average velocity over an infinitesimally small period of time Unit: meters per second (m/s) 


Term
How do you find displacement from a velocity/time graph? 

Definition


Term
How do you find the velocity on a displacement/time graph? 

Definition
Find the slope (slope=velocity) 


Term
How do you find the acceleration on a velocity/time graph? 

Definition
Find the slope (change in velocity/change in time) 


Term
Steps to solving a projectile motion problem 

Definition
Draw a picture Split into x and y components Find time to max height (v = at+v0) Find max height (d = ½ at2 + v0t + d0) Find time from max height to ground (Δd = ½ at2 + v0t) Find total time (total time = time to max height + time to ground) Find range (Δd = v0t – the ½ at2 cancels out) 


Term
What angle gets you maximum projectile rang 

Definition


Term

Definition
A push or a pull Has a direction 


Term

Definition
The sum of all individual forces acting on an object 


Term

Definition


Term

Definition
1. “Law of Inertia” An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by a nonzero outside force 


Term

Definition
“Fnet = ma” The net force acting on an object is equal to the object’s mass times it’s acceleration 


Term

Definition
“actionreaction” For every force that one object exerts on another, the second object exerts a force back on the first that is equal in magnitude but opposite in direction 


Term

Definition
Weight Is a force unit: Newtons force of gravity on an object has direction w = mg Mass not a force unit: kg how hard it is to change an object’s motion no direction constant 


Term

Definition
How closely the measurement agrees with the accepted value. 


Term

Definition
The opposing force air has on a moving object. When it’s equal to gravity, you have equilibrium. 


Term

Definition
Standard ways of measuring. 


Term

Definition
Tells you where the zero point of the variable you are studying is located. 


Term

Definition
Location. Defines the distance and direction between two points. 


Term

Definition
An object is in equilibrium when all the forces acting on it cancel out and the net force is zero. 


Term

Definition
When something is subject only to the force of gravity and nothing else. 


Term

Definition
The average velocity over an infinitesimally small period of time. 


Term

Definition
When objects exert forces on each other. 


Term

Definition
Something’s size; the amount of space it takes up not a force unit: kilograms how hard it is to change an object’s motion no direction constant 


Term

Definition
The highest point an object reaches At the max height velocity = 0 


Term

Definition
The point at which the variables have the value of zero. 


Term

Definition
The exactness of a measurement For a measuring device, precision is equal to ½ the smallest division. 


Term

Definition
The distance something travels horizontally Range = v2sin(2θ)/g (**when launched and lands at same height) 


Term

Definition
The “valid” digits in a measurement. 

