Grade 7 Integrated Science · Strand 1: Scientific Investigation · Laboratory Apparatus & Instruments
Measuring Mass and Weight in the Laboratory
A short Grade 7 Integrated Science lesson for the CBE curriculum, part of Scientific Investigation: Laboratory Apparatus & Instruments. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. Which statement correctly describes the weight of an object?
- A. The amount of matter in the object, measured in kilograms
- B. The downward pull of gravity on the object, measured in newtons
- C. A scalar quantity that never changes anywhere in the universe
- D. The volume of space the object occupies, measured in cm^3
2. A brass bob has a mass of 250 g. Taking the gravitational field strength as 9.8 N/kg, what is its weight on Earth?
Type your answer (in N) in the lesson.
3. A pupil places an empty beaker on a digital balance and presses the tare key before adding sodium chloride. Why does the pupil do this?
- A. To make the balance measure weight in newtons
- B. To increase the precision of the balance to 0.001 g
- C. To reset the display to zero so that only the mass of the sample is shown
- D. To remove the effect of gravity on the sample
4. An astronaut travels from Nairobi to the Moon, where gravity is weaker. Which statement is correct?
- A. Both her mass and her weight stay the same
- B. Her mass decreases but her weight stays the same
- C. Her mass stays the same but her weight decreases
- D. Both her mass and her weight increase
5. Name the laboratory instrument that measures weight directly in newtons.
Type your answer in the lesson.
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