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9TH GRADE

Grade 9 Physics Lessons

Mechanics, vibrations, waves, optics, electromagnetic radiation and nuclear physics. Grade 9 physics topics and lessons with theory, physical quantities, formulas, and related problems.

11 those21 lesson

Kinematics

Coordinates, vectors, graphs, acceleration and circular motion.

3
Frame of reference and uniform motion26 min · Material point, coordinate, displacement, projections and graphs.Uniformly accelerated motion and its graphs30 min · Acceleration, instantaneous velocity, displacement and graphical methods.Free fall, circle and relativity28 min · Fall, centripetal acceleration and relativity of speed.

Newton's laws

Inertial systems, forces, gravity, weight and friction.

2
Newton's three laws28 min · Inertial systems, resultant and interaction pairs.Gravity, elasticity, weight and friction32 min · Universal gravity, Hooke's law, overload and weightlessness.

Curvilinear movement and balance

Centripetal force, satellites and stability of bodies.

2
Circular dynamics and satellites26 min · Centripetal force and first escape velocity.Balance and center of gravity24 min · Moments of forces, center of gravity and stability of balance.

Momentum

Body impulse and force, collisions and jet motion.

1
Momentum and jet propulsion30 min · Body momentum and forces, collisions, rockets and conservation of momentum.

Work and Energy

Work, power and conservation of mechanical energy.

1
Work, power and energy conservation30 min · Kinetic and potential energy in combined problems.

Mechanical vibrations

Pendulums, harmonic, free and forced vibrations.

2
Oscillation parameters and pendulums30 min · Amplitude, period, frequency, phase, mathematical and spring pendulums.Harmonic, damped and forced oscillations26 min · Harmonic law, energy loss and resonance.

Mechanical waves and sound

Types of waves, length, speed, properties and perception of sound.

2
Mechanical waves24 min · Longitudinal and transverse waves, length, frequency and speed.Sound, echo and resonance24 min · Pitch, volume, timbre, ranges and reflection of sound.

Light phenomena

Geometric and wave optics, lenses, color and spectra.

4
Light propagation and reflection24 min · Sources, shadow, eclipses, mirror and the law of reflection.Refraction and total internal reflection28 min · Law of refraction, index and speed of light in a medium.Lenses, eyes and optical instruments30 min · Focus, imaging, lens formula and power.Interference, diffraction and spectra28 min · Wave properties, dispersion, color and types of spectra.

Electromagnetic waves

Occurrence, spectrum, application and safety of radiation.

1
Electromagnetic waves and their ranges28 min · Radio waves, IR, visible light, UV and X-rays.

Atomic structure

Atomic models, spectra, radioactivity and nuclear composition.

1
Atom, nucleus, spectra and radioactivity32 min · Atomic models, nucleons, isotopes, radiation and particle registration.

Nuclear physics

Communication energy, reactions, energy and radiation protection.

2
Binding energy, fission and reactor32 min · Mass defect, chain reaction, critical conditions and nuclear power.Ionizing radiation and thermonuclear fusion30 min · Biological action, protection, synthesis, particles and antiparticles.