GRADE 7

Grade 7 Physics Lessons

Observations and measurements, motion, forces, pressure, mechanisms and energy. Grade 7 physics topics and lessons with theory, physical quantities, formulas, and related problems.

8 those19 lessons

Physics and measurements

Phenomena, experiment, quantities and accuracy of measurements.

Physical phenomena and how we investigate them16 min · What physics studies and how observation turns into a testable experiment.Measuring instruments and accuracy22 min · SI units, scales, scale intervals, and direct and indirect measurements.

Structure of matter

Particles, diffusion, interaction and states of aggregation.

Particles and diffusion18 min · Molecules, particle motion, Brownian motion and diffusion.Interaction between particles and states of matter18 min · Attraction, repulsion and differences between solids, liquids and gases.

Mechanical motion

Frame of reference, path, speed, graphs and acceleration.

Reference frame, trajectory and distance travelled18 min · How motion depends on the reference frame, and how to describe an object's position.Speed, average speed and graphs24 min · Motion at constant and changing speeds, motion equations, and an introduction to acceleration.

Mass and density

Inertia, mass, volume and density of matter.

Inertia, interaction and mass18 min · Why velocity does not change instantly, and how we compare the masses of objects.Volume and density22 min · Define density and use it to calculate mass or volume.

Forces

Gravity, elasticity, weight, resultant and friction.

Force, gravity and apparent weight22 min · Force as a measure of interaction, gravitational force, apparent weight and weightlessness.Elasticity and net force24 min · Deformation, Hooke's law, force meters and adding forces along a straight line.Friction force18 min · Static friction, kinetic friction and rolling resistance in technology and everyday life.

Pressure

Pressure of solids, liquids, gases and hydraulic devices.

Pressure from a solid object and Pascal's law22 min · Contact area, gas pressure and the transmission of pressure through liquids.Hydrostatic pressure and vessels22 min · How pressure depends on depth, and equilibrium in communicating vessels.Atmospheric pressure and hydraulics24 min · Barometers, manometers, pumps and the force gain of a hydraulic press.

Buoyant force and floating

Pushing, navigation conditions, ships and aeronautics.

Buoyant force22 min · Origin of buoyant force and its measurement.Floating objects, ships and balloons20 min · Sinking, rising, equilibrium and average density.

Work, power and energy

Work, simple mechanisms, efficiency and energy conversion.

Mechanical work and power20 min · When work is done and how we compare its rate.Levers and pulleys24 min · Moment arm, torque, lever equilibrium and the golden rule of mechanics.Efficiency and mechanical energy24 min · Useful and total input work, kinetic and potential energy.