Practice — Motion, Force, Work and Sound

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 book on a rough table needs a push to keep moving uniformly. Which force is being balanced by the push?

A.Choose the answer that only names a process without a reason.

B.First identify friction acting opposite motion, then connect it to the scientific principle.

C.Use the trap because it contains a familiar wor

d: assumes a moving object always needs an unbalanced forward force

D.Ignore the observation and write a definition from memory.

Stuck?

Something wrong with this item?