Quick answer: Mass is the amount of matter in an object, measured in kilograms, and it never changes. This grade 7 science test on weight and mass has 8 questions worth 20 marks, to do in 45 minutes: mass and weight, sack of grain and weight on Mars. The mark scheme is on a separate page; free printable PDF.
This test checks the difference between mass and weight, the equation W = m × g and gravity on other planets. Use g = 9.8 N/kg on Earth unless the question gives another value, and show your working.
Level: Grade 7 science (Year 8 · Class 7) · Curriculum: MS-PS2-4
Question 1 Mass and weight (2 marks)
State the unit of mass and the unit of weight, and say which one changes when an object moves from Earth to the Moon.Question 2 Sack of grain (3 marks)
A sack of grain has a mass of 12 kg (g = 9.8 N/kg).- Write the formula you will use. (1 mark)
- Calculate the weight of the sack on Earth. (2 marks)
Question 3 Weight on Mars (3 marks)
The gravitational field strength on Mars is 3.7 N/kg. An explorer has a mass of 70 kg.- Calculate the explorer’s weight on Mars. (2 marks)
- State the explorer’s mass on Mars. (1 mark)
Question 4 Earth and Moon (3 marks)
The diagram shows the same person on Earth and on the Moon.- State the mass of the person on the Moon. (1 mark)
- Explain why the arrow is shorter on the Moon. (2 marks)
Question 5 Finding a mass (2 marks)
An object weighs 58.8 N on Earth. Calculate its mass.Question 6 Why the Moon is weaker (3 marks)
Explain why the gravitational field strength on the Moon is smaller than on Earth and describe what an astronaut would notice when lifting a rock.Question 7 Bathroom scale (2 marks)
A scale shows “55 kg”. State whether it displays a mass or a weight and explain what it really measures.Question 8 Spring scale reading (2 marks)
A 0.80 kg book hangs from a spring scale on Earth. Calculate the reading on the scale (g = 9.8 N/kg).
