CBSE 9 Science · U3
Motion, Force, Work and Sound
Syllabus-listed 23-mark theory unit covering motion in one dimension, displacement, velocity, acceleration, distance-time and velocity-time graphs, equations of motion by graphical method, uniform circular motion, Newton's laws, friction, work, energy, power, simple machines, and sound waves.
Test yourself
A focused, distraction-free run through 80 multiple-choice questions. Hints if you need them; your score at the end.
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.
Topic 3.1
Motion and Graphs
Distance, displacement, speed, velocity, acceleration, position-time graphs and velocity-time graphs.
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Topic 3.2
Equations of Motion and Circular Motion
Kinematic equations for uniformly accelerated motion and elementary uniform circular motion.
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Topic 3.3
Force, Friction and Newton's Laws
Balanced and unbalanced forces, friction, inertia, Newton's laws and force from mass and acceleration.
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Topic 3.4
Work, Energy, Power and Simple Machines
Work done by a constant force, kinetic energy, potential energy, conservation of energy, power and mechanical advantage.
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Topic 3.5
Sound Waves and Applications
Production and propagation of sound, longitudinal waves, wavelength, frequency, time period, amplitude, speed, pitch, loudness, echo and reverberation.
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