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AQA · GCSE · Physics · Higher

Vertical Forces in Equilibrium

Q02.1 2 marks

Figure 5 shows a young child using a baby walker.

Figure 5
Figure 5

Figure 5

Enlarged question image

Figure 5

The child is standing still.

What is the resultant vertical force on the child? Give a reason for your answer.

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Marking points

  1. 1 States 0 N.
  2. 2 Explains that there is no vertical acceleration or that the upward and downward forces are balanced.

Full-mark answer

Resultant vertical force = 0 N. The child is not accelerating vertically, so the upward forces balance the downward forces.

Why this answer loses marks

There are no vertical forces on the child.

Weight and support forces do act; standing still means they balance, leaving no vertical acceleration.

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