2020HSCShort answer

Q12 (a) (ii)

2 marks

Question

Show that the net force horizontally is approximately $53.2$ newtons.

Try the question before revealing the answer.

Solution

Criteria	Marks
Provides correct solution	2
Correctly obtains the horizontal component of the 200 newton force, or equivalent merit	1

Sample answer:

Horizontally,

\text{Net horizontal force}=200\cos30^\circ-0.3R

=200\times\frac{\sqrt3}{2}-0.3\times400

\approx53.2\text{ newtons}

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Syllabus alignment

Mechanics

Modelling motion without resistanceApply forces, Newton's laws and calculus to model straight-line motion without resistance.

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