Motion, Force and Newton's Laws — O/L Science

How do I practise Motion, Force and Newton's Laws?

1 question with a worked solution · 6 marks

1. 2022 · Paper II · 6 marks
   Question 7 gives a car of stated mass accelerating from rest to a stated speed in a stated time on a straight road. It asks you to calculate the acceleration, then the resultant force while stating the formula used, and to state Newton's First Law with one everyday example.
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   (i) a = (v − u) / t = (30 − 0) / 12 = 2.5 m/s² (ii) F = ma = 1 200 × 2.5 = 3 000 N (iii) An object remains at rest or in uniform motion in a straight line unless acted upon by a resultant (unbalanced) force. Example: a book lying still on a table stays still because the normal reaction and gravity are balanced.
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2022, Paper II, Question 7 · https://doenets.lk/pastpapers

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