Physics. Moderate Level. Age 13-14. .9th Grade, High School Freshman / SSS1.

Grade 9 physics, students typically cover foundational concepts in physics. Here's an overview of the topics commonly included:

1. Motion:

   • Understanding of types of motion (uniform motion, non-uniform motion, circular motion).
   • Concepts of distance, displacement, speed, velocity, and acceleration.
   • Equations of motion for uniformly accelerated motion.

2. Force and Laws of Motion:

   • Newton's laws of motion (first, second, and third laws).
   • Concepts of force, inertia, momentum, and impulse.
   • Application of Newton's laws to solve problems related to motion.

3. Gravitation:

   • Understanding the force of gravitation and the universal law of gravitation.
   • Kepler's laws of planetary motion.
   • Gravitational force and its effects on objects on Earth and in space.

4. Work, Energy, and Power:

   • Definitions and concepts of work, energy, and power.
   • Different forms of energy (kinetic, potential, mechanical, etc.).
   • Conservation of energy and its applications.

5. Sound:

   • Nature and propagation of sound waves.
   • Characteristics of sound waves (amplitude, frequency, wavelength, speed).
   • Reflection, refraction, and resonance of sound.

6. Matter in Our Surroundings:

   • Classification of matter into solid, liquid, and gas.
   • Changes in matter (physical and chemical changes).
   • Evaporation, condensation, sublimation, and diffusion of matter.

7. Atmospheric Pressure:

   • Understanding the concept of pressure and its measurement.
   • Atmospheric pressure and its variations with altitude.
   • Barometer and its principle.

8. Floatation:

   • Archimedes' principle and its applications.
   • Buoyancy and the concept of upthrust.

9. Natural Phenomena:

   • Lightning, earthquakes, and their causes.
   • Basic understanding of earthquakes and their measurement (seismograph).
   • Safety measures during natural calamities.

10. Grading and Assessment:

    • Assessments typically include regular tests, quizzes, lab work, and examinations to evaluate understanding and application of concepts.

This overview provides a general idea of the topics covered in grade 9 physics under the CBSE curriculum. It's important to refer to the official CBSE curriculum documents and textbooks for detailed information and specific learning outcomes.