University:
College
Course:
College Physics
Academic year:

2022
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366

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1
Author:

5CelestialChronicle

Name ___________________________ Chapter 3 Class __________________ Date ____________ Newton’s First Law of Motion—Inertia Making Unit Conversions Foods manufactured and packaged outside the United States state the amount in the package in mass units. If a package of cookies manufactured in England contains 0.68 kg, what is the weight in pounds (lb) in the package? 1. Read and Understand What information are you given? Mass of the cookies = 0.68 kg 2. Plan and Solve What unknown are you trying to calculate? Weight of the cookies What is the relationship between kilograms and pounds? 1 kilogram = 2.2 pounds Use this relationship as conversion factors. 1 kg or 2.2 lb 2.2 lb 1 kg Use the value that you know and choose the correct conversion factor. 0.68 kg s 2.2 lb 1.5 lb 1 kg 3. Look Back and Check Is your answer reasonable? Yes, the cookies have a mass of less than 1 kg and the calculated number is less than 2.2 pounds. Also, the units canceled correctly, so the correct conversion factor was used. Math Practice On a separate sheet of paper, solve the following problems. 1. A large package of chocolate from Switzerland contains 1.8 kilograms. What is the weight of the chocolate in pounds (lb)? weight = 1.8 kg s 2.2 lb 4.0 lb 1 kg 2. A canned meat product manufactured in the United States contains 0.75 pound. If the product were sold in Europe, how many kilograms would the label show? weight = 0.75 lb s 1 kg 0.34 kg 2.2 lb 3. A large instrument used by astronauts weighs 2.50 pounds on Earth. What is the mass of the instrument on the moon? (Hint: On the surface of the moon, the object would have only one sixth the weight it has on Earth.) 1kg mass = 1 s 2.50 lb s = 0.19 kg 6 2.2 lb