Quantities, Variables, Units and T-Charts 8/28/13

Agenda Check off homework Bellwork Go over homework T-Chart notes

Quantity, Variable and Unit Quantity: a physical property of a object, that can be quantified by measurement(s) Variable: a symbol that represents a quantity - used in equations and formulas Unit: a standard amount of a physical quantity - how it is measured

Quantity, Variable and Units Distance (Δd): m (meter), km, mile, cm Time (Δt): s (seconds), hr (hours), min Velocity and speed (v): m/s, km/hr or miles/hr (mph)

Quantity, Variable and Units Distance (Δd): m (meter), km, mile, cm Time (Δt): s (seconds), hr (hours), min Velocity and speed (v): m/s, km/hr or miles/hr (mph) Where, “Δ” (delta) is a mathematical operator meaning: change of (final – initial)

T-Charts T-Chart: a way to organize problems

T-Charts Form Start with a “†” 1) What are you looking for? 2) What do you know? 3) What equation(s) have these variables? 4) What is the work to solve the problem? 5) What is the answer with the amount (magnitude) and unit(s)?

Δ d v = —— Δ t Velocity Equation “Δ” (delta) is a mathematical operator meaning “change of” or (final – initial)

T-Chart Example Given Δd = 88.11 m and v = 9.7 m/s; find Δt. “Δ” (delta) is a mathematical operator meaning change of (final – initial)

Due Dates HW: # 133-148 due Tomorrow! HW: # 149-158 due FRI. 8/30/13 Math Concept Test on WED. 9/4/13 You should be working on these assignments!