1 / 13

Factor-Label Method

Factor-Label Method. Section 2.6 p 28-33. Based on Conversion factors, which are relationships between the units. A conversion factor is used to convert a unit to any other related unit. The conversion factor is derived from the equivalence statement of the two units.

dai
Download Presentation

Factor-Label Method

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Factor-Label Method Section 2.6 p 28-33

  2. Based on Conversion factors, which are relationships between the units. • A conversion factoris used to convert a unit to any other related unit. • The conversion factor is derived from the equivalence statement of the two units. • For example: 1 inch = 2.54 cm. • It is a ratio equivalent to 1

  3. ALWAYS WORK THROUGH THE BASE UNITS!!!!!!! • Example: 1 m = 100 cm • The correct choice is the one that allows the cancellation of the unwanted units.

  4. Problem Solving Strategies: • 1. Write the known value (given) • 2. Draw the baseline (cross) • 3. Write the wanted units (units of the answer) • 4. Write the necessary conversion factors • If the unit to be eliminated is in the numerator of the given information then that unit should appear in the denominator of the conversion factor, and vice versa.

  5. Example: How many milligrams are in 2 micrograms? • Step 1: Write the given. • Step 2: Draw the baseline • Step 3: Write the wanted units (units of the answer) • Step 4: Write the conversion factor(s). • SINCE I DO NOT KNOW A DIRECT RELATIONSHIP, I WORK THROUGH THE BASE UNIT

  6. Example: Given: 60 km/hr Want: cm/s

  7. Example: You are driving 65 mph and take your eyes off the road for “Just a Second.” How many feet do you travel in this time? What is the given? 1 second How can 65 mph be used? It’s a conversion factor

  8. To Convert between the Customary and SI System 1 inch = 2.54 cm2.20 lb = 1 kg • Convert the following quantities from one unit to another •  30 m to mi • 1500 yd to mi • 206 mi to m • 34 kg to lbs • 34 lb to kg

  9. In the lab we need to determine the reliability of our measurements2 ways • Accuracy - how close is a measurement to the true or correct value for the quantity. • Percent error • Precision - how close a set of measurements for a quantity are to one another, regardless of whether the measurements are correct. • Significant digits

  10. Accurate or Precise?!?!?

  11. Consider the three sets of data below that have been recorded after measuring a piece of wire that was exactly 6.000 cm long. • Which set of data is the most accurate? • Which set of data is the most precise? • Which set of data is more precise, set X or set Z? Set Y Set Z

  12. Precise or Accurate?!?!? • A nickel has a mass of 5.0 g. • You measure it 4 times: • 1.05 g • 10.13 g • 6.28 g • 0.92 g • 10.62 g • 10.70 g • 10.69 g • 10.65 g • 4.91 g • 5.00 g • 5.09 g • 4.99 g

More Related