How to use the triangle method to solve for an unknown.. How to put formulas into the triangle. The ‘signs’ of the triangle. What is the unknown? What.

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Presentation transcript:

How to use the triangle method to solve for an unknown.. How to put formulas into the triangle. The ‘signs’ of the triangle. What is the unknown? What are the other two units? Solving math problems on the Science TAKS. How to solve for an unknown using the “reverse the sign” method. How to solve for an unknown using the “cross multiply” method. Calculator clues. The formula chart

What is the unknown? Home Look at the last sentence of the question. Double underline the unknown. See sample The unknown usually follows after “what” or “how many” or “when” or “how far” etc.

Anything moving vertical Push current Resistance Velocity and speed are the same thing, except velocity should include the direction that the object is going. Sometimes on TAKS they use the word ‘velocity’ equally as ‘speed’. See how to put formulas into a ‘triangle’

Home A mechanic used a hydraulic lift to raise a 12,054 N car 1.89 m above the floor of a garage. It took 4.75 s to raise the car. What was the power output of the lift? A 489 W B 1815 W C 4796 W D 30,294 W

What are the other two units? Home Sometimes there are clearly only two other numbers in the question. The units of those numbers tell you about the formula to look for on the formula chart. Sample of units and their meaning on the formula chart. Other times, only one number is given and an illustration gives the other number. 1. Sample of only one number given. 2. Sample of when only one number is given & you use the gravity number.

Back UnitOn the formula chart kg or g L or mL o C km or m or cm hour or sec N Mass Volume Temperature Distance Time Force

Which wave has the greatest velocity? Velocity = frequency times wavelength 1 x 2 2 x 8 3 x 3 4 x 1 Back

An ant crawled from Point A to Point B in 4.0 seconds. To the nearest tenth, what was the ant’s speed in centimeters per second? Record and bubble in your answer on the answer document. 4cm ÷ 4 s = 1 cm/s Back

How many newtons of force does a 50.0 kg deer exert on the ground because of gravity? Record and bubble in your answer on the answer document. 490 Force = mass x acceleration of gravity 50 kg x 9.8 = Home

The ‘signs’ of the triangle. Home ÷÷ x

How to use the triangle method Home ÷÷ x Cover the unknown with your finger. Do the function between the other two. c c = a ÷ b b = a ÷ ca= b x c a b

How to put formulas into the triangle. Home If part of the formula is already on top (numerator) it stays on the top. If the formula doesn’t have a fraction, the ‘loner’ gets to be on top. d ts d m v momentum mass velocity force massacceleration work force distance

Solving for an unknown using the “reverse the sign” method: If distance is the unknown, x time Speed x time = distance x time Speed = distance / time Another sample of “reverse the sign”

Solving for an unknown using the “reverse the sign” method: Home If time is the unknown, Speed = distance / time Speed = distance/time ÷ distance Speed ÷ distance = time Speed ÷ distance = distance/time ÷ distance

Solving for an unknown using the “cross multiply” method: Home If time is the unknown, distance x 1 ÷ speed = time Speed = distance 1 time

Home Remember that ⅝ is pushed into the calculator as 5 ÷ 8 = or 5 / 8 =