Test yourself

Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. What is a force?

    • The mass of an object
    • A kind of energy
    • A push or a pull
    • The speed of an object

  2. What is force measured in?

    • Joules (J)
    • Metres (m)
    • Kilograms (kg)
    • Newtons (N)

  3. Which of these is a non-contact force?

    • Magnetic force
    • Tension
    • Friction
    • Air resistance

  4. On a force diagram, what does a longer arrow show?

    • A faster object
    • A force that lasts longer
    • A heavier object
    • A bigger force

  5. One team pulls left with 500 N. The other pulls right with 300 N. What is the resultant force?

    • 200 N to the right
    • 0 N
    • 200 N to the left
    • 800 N to the left

  6. The forces on an object are balanced. What is the resultant force?

    • It depends on the object
    • The same as its weight
    • 0 N
    • 1 N

  7. Which of these needs a lot of friction to work?

    • A door hinge
    • A bike brake
    • A playground slide
    • A bike chain

  8. Why does a parachute slow a skydiver down?

    • It is streamlined
    • It makes the skydiver lighter
    • It switches off gravity
    • Its big area makes a lot of air resistance

  9. A hammer and a feather are dropped together in a vacuum. What happens?

    • They land together
    • The hammer lands first
    • The feather lands first
    • They both float

  10. A moving object has balanced forces on it. What does it do?

    • Slows down and stops
    • Stops at once
    • Speeds up
    • Keeps moving at a steady speed
Answers
  1. A push or a pull. Every force is a push or a pull.
  2. Newtons (N). The newton is the unit of force.
  3. Magnetic force. A magnet pulls across a gap. The other three need things to touch.
  4. A bigger force. The length of the arrow shows the size of the force.
  5. 200 N to the left. 500 N − 300 N = 200 N, in the direction of the bigger force.
  6. 0 N. Balanced forces cancel out.
  7. A bike brake. Brakes grip the wheel. The other three work best with little friction.
  8. Its big area makes a lot of air resistance. A bigger area catches more air, so the drag is bigger.
  9. They land together. With no air there is no air resistance to slow the feather.
  10. Keeps moving at a steady speed. Balanced forces do not change the motion.