Lesson 3.03b

3.03b Newton's first law Quiz: OCR Maths, Unit 18

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.03b, Newton's first law: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, written with Revision Ninja.

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The 20 questions

  1. According to Newton's first law, what happens to an object when net force is zero?

    • Constant acceleration
    • It decelerates
    • Constant velocity
    • Infinite speed

  2. What state is a particle in if the resultant force acting on it is zero?

    • Uniform acceleration
    • Free fall
    • Equilibrium
    • Terminal displacement

  3. If a particle remains at rest, what must be the resultant force acting on it?

    • Equal to gravity
    • Equal to mass
    • Zero
    • Positive

  4. Newton's first law states an object remains at rest unless acted upon by what?

    • Constant mass
    • Internal force
    • Resultant force
    • Gravitational field

  5. What physical quantity is zero when a body moves with a constant velocity?

    • Displacement
    • Momentum
    • Speed
    • Acceleration

  6. Which term describes a set of forces that sum to a zero resultant force?

    • Balanced forces
    • Unbalanced forces
    • Contact forces
    • Reaction forces

  7. What is the SI unit of force used when calculating resultant forces?

    • Joule
    • Watt
    • Newton
    • Pascal

  8. On a free body diagram, how are forces acting on a particle represented?

    • Scalars
    • Vectors
    • Dashed lines
    • Curves

  9. A car travels along a straight road at a constant speed. What is the resultant force?

    • 9.8 N
    • 60 N
    • 0 N
    • 600 N

  10. A crate rests stationary on a horizontal floor. Which vertical force balances its weight?

    • Normal reaction
    • Thrust
    • Tension
    • Friction

  11. A box slides at constant velocity against 15 N of friction. What forward force acts?

    • 30 N
    • 15 N
    • 147 N
    • 0 N

  12. A particle experiences forces (3i + 4j) N and (-3i - 4j) N. What is its acceleration?

    • 0 m/s²
    • 2 m/s²
    • 5 m/s²
    • 9.8 m/s²

  13. A cable lifts a crate upwards at constant speed. Tension is 500 N. What is weight?

    • 0 N
    • 500 N
    • 250 N
    • 1000 N

  14. A book of weight 20 N rests on a desk. What is the contact force?

    • 0 N
    • 20 N
    • 9.8 N
    • 196 N

  15. A particle has forces 8 N right and 3 N left. What force achieves equilibrium?

    • 5 N right
    • 5 N left
    • 11 N right
    • 11 N left

  16. An object moves in a straight line with zero acceleration. What must be true?

    • Forces are balanced
    • Forces are unbalanced
    • Object is stationary
    • Speed is increasing

  17. Forces (2i - 5j) N, (i + 2j) N, and F keep a particle in equilibrium. What is F?

    • (-3i - 3j) N
    • (-3i + 3j) N
    • (3i + 3j) N
    • (3i - 3j) N

  18. A particle on a slope is held in equilibrium. What is the net force?

    • 0 N
    • mg sin theta
    • mg
    • mg cos theta

  19. Forces (a i + 4 j) N and (-2 i + b j) N balance. What are values of a and b?

    • a = -2, b = -4
    • a = 2, b = -4
    • a = 2, b = 4
    • a = -2, b = 4

  20. A skydiver falls at constant terminal velocity. How does air resistance compare to weight?

    • Equal to weight
    • Zero
    • Less than weight
    • Greater than weight

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