FRQ — Motion, Force, Work and Sound

Long answer·Hard exam skill (4/5)·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 uniformly accelerated object has initial velocity

u

, acceleration

a

and velocity

v

after time

t

. Use a velocity-time graph idea to obtain two equations of motion.

Total: 5 marks

(a) Write the slope relation and obtain $v=u+at$ . (2 marks)

(b) Use area under the graph to obtain $s=ut+\frac{1}{2}at^2$ . (3 marks)

Your response (optional — you can also work on paper)

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