Exam-style question
Try this first
An object is in equilibrium when the resultant force acting on it is zero. Which of the following scenarios describes this condition?.
- A.A book resting on a table
- B.A car accelerating down a hill
- C.A ball thrown upwards
- D.A person pushing a wall
Model answer
What a good answer should say
- A book resting on a table
Explanation
Why this works
In equilibrium, the resultant force is zero. A book resting on a table has gravitational force acting downwards balanced by the normal force from the table acting upwards, resulting in no net force.
Common mistake
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