# Shared Flashcard Set

## Details

midterm-really good
-
34
Physics
Not Applicable
01/18/2005

Term
 -Accuracy
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 non-zero 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
 -Acceleration
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
 -Velocity
Definition
 -Has magnitude and direction (vector)-Use arrows to represent velocity (-------)-Velocity = change in displacement (Δd) / change in time (Δt)-Velocity = Slope of a displacement-time 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
 -Area method
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
 θ = 45°
Term
 -Force
Definition
 -A push or a pull-Has a direction
Term
 -Net force on an object
Definition
 -The sum of all individual forces acting on an object
Term
 1 N=?
Definition
 1 N = 1 kg m/s^2
Term
 Newton's first law
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
 -Second law
Definition
 -“Fnet = ma”-The net force acting on an object is equal to the object’s mass times it’s acceleration
Term
 -Third law
Definition
 -“action-reaction”-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
 -Weight vs. Mass
Definition
 Weight-Is a force-unit: Newtons-force of gravity on an object-has direction-w = mgMass-not a force-unit: kg-how hard it is to change an object’s motion-no direction-constant
Term
 Accuracy
Definition
 How closely the measurement agrees with the accepted value.
Term
 Air resistance
Definition
 The opposing force air has on a moving object. When it’s equal to gravity, you have equilibrium.
Term
 Base units
Definition
 Standard ways of measuring.
Term
 Coordinate System
Definition
 Tells you where the zero point of the variable you are studying is located.
Term
 Displacement
Definition
 Location. Defines the distance and direction between two points.
Term
 Equilibrium
Definition
 An object is in equilibrium when all the forces acting on it cancel out and the net force is zero.
Term
 Freefall
Definition
 When something is subject only to the force of gravity and nothing else.
Term
 Instantaneous Velocity
Definition
 The average velocity over an infinitesimally small period of time.
Term
 Interaction
Definition
 When objects exert forces on each other.
Term
 Mass
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
 Max Height
Definition
 -The highest point an object reaches-At the max height velocity = 0
Term
 Origin
Definition
 The point at which the variables have the value of zero.
Term
 Precision
Definition
 -The exactness of a measurement -For a measuring device, precision is equal to ½ the smallest division.
Term
 Range
Definition
 -The distance something travels horizontally -Range = v2sin(2θ)/g (**when launched and lands at same height)
Term
 Significant Digits
Definition
 -The “valid” digits in a measurement.
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