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Weight and mass – practice for Years 7–8

Sample questions on Weight and mass with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject
Physics
Year
Years 7–8
Curriculum area
Motion and forces

Question types: Newton meters and weight

Rule: Weight and mass

W = m × g, on Earth g ≈ 10 N/kg: a mass of 1 kg weighs about 10 N.

From the newton meter reading you get the mass: m = W ÷ g. Force is in newtons (N), mass in kilograms.

Example: The newton meter shows 3 N: m = 3 ÷ 10 = 0.3 kg = 300 g

Watch out: Mass is not weight: on the Moon an object weighs less, but its mass stays the same.

Sample questions

  1. Question 1 Easy

    How large is the force with which the weight pulls on the newton meter?

    012345678910N
    Show the solution
    Answer: 5 N

    How it works: The pointer is at 5 N.

  2. Question 2 Normal

    A weight hangs on the newton meter. What is its mass in grams? Use g = 10 N/kg.

    012345N
    Show the solution
    Answer: 240 g

    How it works: F = 2.4 N; m = F ÷ g = 2.4 N ÷ 10 N/kg = 0.24 kg = 240 g.

  3. Question 3 Hard

    What is the weight of a car with a mass of 1.1 t? Give the answer in N. Use g = 10 N/kg.

    Show the solution
    Answer: 11 000 N

    How it works: 1.1 t = 1100 kg; F = 1100 kg × 10 N/kg = 11 000 N.

Related topics

All Physics topics

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