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How to use the triangle method to solve for an unknown..

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

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How to use the triangle method to solve for an unknown..

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

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

  3. 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’. Anything moving vertical See how to put formulas into a ‘triangle’ Push current Resistance

  4. 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

  5. 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.

  6. Back

  7. 1 x 2 Back Which wave has the greatest velocity? 2 x 8 3 x 3 4 x 1 Velocity = frequency times wavelength

  8. 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

  9. 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. Force = mass x acceleration of gravity 50 kg x 9.8 = 490 Home

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

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

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

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

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

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

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

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