Video on graphing-WATCH!! http://www.bozemanscience.com/beginners- guide-to-graphing-data http://www.bozemanscience.com/beginners- guide-to-graphing-data
Equations Equations in physics are used to show relationships between physical quantities Equations are a compact statement modeling a situation Equations show how 2 or more variables are thought to be related
Physics Equations Letters are often used to represent specific quantities V often represents velocity and t, time Greek letters are used to describe mathematical operations Δ “delta” means “difference or change in” Σ “sigma” means “sum or total” V = Δ x Δt
Evaluating Results in Physics Dimensional Analysis— It is your best tool!!! – Dimensions can be treated as algebraic quantities Quantities can be added or subtracted only if have same units Two sides of any given equation must have the same units – When use units in calculations, you can check to see if you have set up the equation correctly.
Evaluating Results in Physics Does your answer seem reasonable? Estimate what answer should be and see if you are within an order of magnitude.
Number of students = about 70 Amount of ice cream per student = pint per week Amt of ice cream per year = 70 students x 1 pint/week·student x 52 weeks = 3640 pints 3640 pints x 1 gallon/8 pints = 455 or 460 gallons Estimate how much ice cream the senior class at WC eats in a year.