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Mass vs Weight Measurement

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Mass vs Weight Measurement

A science team is preparing equipment for a trip from Earth to the Moon. Use the information and data on this sheet to distinguish mass from weight and solve the measurement problems. Use g = 9.8 N/kg on Earth and g = 1.6 N/kg on the Moon.

Part A: Get the science right

The mass of an object describes how much matter it contains. Weight is the gravitational force acting on that mass. The relationship is weight = mass × gravitational field strength.

1.A team member says, “The equipment case has a mass of 12 kg on Earth, so it will have a smaller mass on the Moon.” Is this correct? Explain what changes and what stays the same.
2.Choose the correct measurement pairing for a science report.
  • Mass is a force measured in newtons; weight is measured in kilograms.
  • Mass is measured in kilograms or grams; weight is a force measured in newtons.
  • Mass and weight are both measured only in newtons.
  • Mass and weight are identical measurements, so either unit is suitable.
3.Complete the conversion for a sample container: 2.45 kg = g.
4.A student records a rock's mass using a balance. Which instrument is designed to measure weight as a force?
  • A spring scale or force meter
  • A ruler
  • A measuring cylinder
  • A stopwatch

Part B: Calculate and compare

Use weight = mass × gravitational field strength. Convert grams to kilograms before calculating weight. Give weight answers in newtons (N).

Item

Mass

Location

Tool case

8 kg

Earth

Tool case

8 kg

Moon

5.Using the equipment readings above, calculate the tool case's weight on Earth. Show the calculation and include the correct unit.
6.Calculate the same tool case's weight on the Moon. Use its mass from the readings and the Moon's gravitational field strength given in the mission instructions.
7.How many times greater is the tool case's weight on Earth than on the Moon? Compare the two calculated weights.
8.True or false: A 500 g sample has a mass of 0.5 kg, and on Earth its weight is 4.9 N. Show enough working to support your choice.
9.A team member writes, “I weigh 60 kg.” Rewrite this as a scientifically precise statement, explaining which measurement 60 kg describes.

2 printable pages

  • Mass vs Weight Measurement, page 1 of 2: Part A: Get the science right

    Page 1

  • Mass vs Weight Measurement, page 2 of 2: Part B: Calculate and compare

    Page 2

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