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Lesson: Newton’s Third Law of Motion

In this lesson, we will learn how to solve problems on Newton's third law, which states that for every action, there is a reaction equal in magnitude and opposite in direction.

Worksheet: Newton’s Third Law of Motion • 21 Questions

Q1:

An elevator is accelerating vertically upwards at . A man of mass is standing inside. Determine the reaction force of the floor on the man.

  • A892.8 N
  • B
    1 537.6
    N
  • C322.4 N
  • D
    1 215.2
    N

Q2:

An elevator was accelerating vertically downwards at 1.7 m/s2. Given that the acceleration due to gravity is , find the reaction force of the floor to a passenger of mass 103 kg.

  • A
    1 184.5
    N
  • B834.3 N
  • C175.1 N
  • D
    1 009.4
    N

Q3:

An elevator is moving vertically upwards at a constant speed. A man of mass 150 kg is standing inside. Determine the reaction force of the floor on the man. Take .

  • A
    1 470
    N
  • B9.8 N
  • C150 N

Q4:

A body of mass 4 kg is hanging from a spring balance fixed to the ceiling of a lift. Given that the reading on the balance is 1 042 g-wt, determine the magnitude of the acceleration of the lift. Take .

  • A0.74 m/s2
  • B7.25 m/s2
  • C9.54 m/s2
  • D12.35 m/s2

Q5:

A lift is ascending with an acceleration of 140 cm/s2. Given that a person standing inside the lift is exerting a force of 106 kg-wt on the floor, find his mass. Take .
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