Pupil sheet · Mass, weight and density

Mass, weight and density — return questions

Name ______________________ Date ____________

Use one to two weeks after the lessons. Keep the notes and the lesson closed.

1. state / calculate / explain

Keep the lesson closed. (a) State what mass is and its unit. (b) State what weight is and its unit. (c) An apple has a mass of 0.10 kg. Calculate its weight on Earth (g = 9.8 N/kg). (d) Explain why an equal-arm balance gives the same result on the Moon as on Earth. (e) A stone falls on Earth with no air resistance to slow it. What is its acceleration, and how is that number linked to g?

(a) Mass and its unit

(b) Weight and its unit

(d) Why the balance works on the Moon

(e) Acceleration of free fall

2. define / describe / calculate

Keep the lesson closed. (a) Define density and write its equation. (b) Describe how to find the volume of a small stone that sinks. (c) 20 cm³ of a liquid has a mass of 25.0 g. Calculate its density. (d) How do you find the mass of a liquid in a measuring cylinder on a balance? (e) How do you find the volume of a rectangular block?

(a) Definition and equation

(b) Volume of a stone

(d) Mass of a liquid

(e) Volume of a block

3. calculate / predict / explain

Keep the lesson closed. (a) A block has a mass of 40 g and a volume of 50 cm³. Calculate its density and say whether it floats in water (1.00 g/cm³). (b) Liquids X (0.70 g/cm³) and Y (1.20 g/cm³) do not mix. Which one forms the top layer? (c) A pupil says: “Heavy things sink.” Use one example to show that this is wrong.

(a) Density and float or sink

(b) Top layer