Newton's third law and connected particles

Newton's third law and connected particles Quiz

Spec 8.4 · Edexcel A-Level Maths: Quiz

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  1. 1. A book rests on a table. Which force forms a Newton's third-law pair with the weight of the book?

    • A. The normal reaction of the table on the book
    • B. The force of the book on the table
    • C. The gravitational force of the book on the Earth
    • D. The friction between the book and table

  2. 2. Particles of mass 2 kg and 3 kg hang over a smooth pulley on a light inextensible string. Find the acceleration.

    • A. 9.8 m s−29.8\ \text{m s}^{-2}
    • B. 0.98 m s−20.98\ \text{m s}^{-2}
    • C. 3.92 m s−23.92\ \text{m s}^{-2}
    • D. 1.96 m s−21.96\ \text{m s}^{-2}

  3. 3. A person of mass 50 kg stands in a lift that accelerates downwards at 2 m s−22\ \text{m s}^{-2}. Find the reaction of the floor.

    • A. 590590 N
    • B. 390390 N
    • C. 490490 N
    • D. 100100 N

  4. 4. A 20 N force pushes a 2 kg block that is in contact with a 3 kg block on a smooth surface. Find the force between the blocks.

    • A. 88 N
    • B. 1212 N
    • C. 2020 N
    • D. 44 N

  5. 5. Which modelling assumptions make the tension equal on both sides of a pulley?

    • A. A light string and a smooth pulley
    • B. Particles of equal mass
    • C. A fixed pulley only
    • D. An inextensible string only

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