Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A school van moves uniformly on a straight road. It then brakes suddenly at a traffic signal. A student wearing a seat belt remains held to the seat, while a loose bag slides forward.
Total: 5 marks
(a) Which law explains the bag's forward motion? (1 mark)
(b) Why does the bag slide forward? (1 mark)
(c) What role does the seat belt play for the student? (2 marks)
(d) Name the physical property involved in this situation. (1 mark)
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