Physics

Physical Quantities

Length, mass, time, speed, force, pressure, heat, current, voltage and power: what each quantity means and how it is measured, with 3D models of the instruments you can look at from every side.

40 lessons
Lesson 1 free
3D
AR

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All 40 lessons

Taught with 3D models and AR.

Lesson 1Free
Are You Very Big?

Measurement of length and different dimensions, their units, and use of rulers, measuring tapes, and digital callipers.
Lesson 2
Let’s Measure It

Micrometre construction, use and measurement accuracy, the Vernier scale, and fundamentals of precision measurement.
Lesson 3
Move Your Body!

Distance travelled, displacement, the path and trajectory of motion, and methods for measuring displacement.
Lesson 4
Mass on the Balance

Mass, its units, the difference between mass and weight, and the operation of mechanical and electronic balances.
Lesson 5
Unstoppable Time

Development of time measurement, determining years, months and days, and the operation of mechanical clocks.
Lesson 6
Let’s Count the Time

Digital time measurement, quartz oscillators, frequency division, seven-segment displays, and the operation of stopwatches and atomic clocks.
Lesson 7
Space in Space

Determining volume by calculation, measuring cylinder and liquid displacement, and measuring the volume of liquids and gases.
Lesson 8
How High Does Water Reach?

Liquid-level measurement using a scale, dipstick, float, and non-contact radar level meter.
Lesson 9
Why Do Boats Float?

The concept and calculation of density, comparing the densities of solids, liquids and gases.
Lesson 10
Sitting in a Swing

Period of a simple pendulum, operation of pendulum clocks and metronomes, and the conical pendulum and orbital motion.
Lesson 11
From Slow to Fast

Velocity and average speed, their units, the speed of light, and methods of speed measurement.
Lesson 12
Dynamism

The concepts of acceleration and deceleration, gravitational acceleration, and the operation of different accelerometer sensors.
Lesson 13
Shedding Light on Light

Measurement of luminous intensity and illumination, candela and lux, and the operation of photoresistors and light sensors.
Lesson 14
Being Loud

Sound intensity, sound frequency and sound pressure, and the operation of microphones and sound level meters measuring in decibels.
Lesson 15
An Unexpected Turn of Events?

The concept and measurement of rotational speed, RPM, examination of rotational motion, and the stroboscopic measurement method.
Lesson 16
The Power of the Force

The concept, unit and direction of force, and the operation of spring, hydraulic and electrical force meters.
Lesson 17
Heat is Heat

Temperature measurement, Celsius and Kelvin scales, and liquid, bimetallic, gas and infrared thermometers.
Lesson 18
Thermal Contraction & Expansion

Linear and volumetric thermal expansion, expansion coefficients, bimetals, dilatometers, and practical consequences of thermal expansion.
Lesson 19
Under Pressure

The concept and units of pressure, liquid and atmospheric pressure, U-tube manometers, and mercury barometers.
Lesson 20
Manometers

Pressure measurement in liquids and gases, diaphragm manometers, vacuum measurement, and the operation of blood-pressure monitors.
Lesson 21
Stretch Your Legs!

The concept of strain, strain gauges and rosettes, and different methods of measuring deformation.
Lesson 22
Up and Down

Elastic deformation, spring force and spring constant, and the behaviour of springs connected in series and parallel.
Lesson 23
The Turning Effect

Torque, lever arm and direction, torque wrenches, levers, and brake-bench torque measurement.
Lesson 24
Go with the Flow!

Flow velocity of liquids, its dependence on cross-section, and mechanical, differential-pressure, electromagnetic and ultrasonic measurement.
Lesson 25
Airflow

Measurement of gas flow velocity, anemometers, rotameters, wind-direction indicators, and Pitot-tube velocity measurement.
Lesson 26
Flow on the Scale

The concept of volumetric flow rate and its measurement by volumetric, weir and ultrasonic methods, and with water and gas meters.
Lesson 27
How Strong is the Current?

Electric current: concept, unit, series measurement, soft iron instruments, and overcurrent protection.
Lesson 28
Beware of High Voltage

The concept and unit of voltage, parallel voltage measurement, analogue voltmeters, and digital multimeters.
Lesson 29
Limits and Regulates

The concept of electrical resistance, Ohm's law, multimeter measurement, comparison method, and the Wheatstone bridge.
Lesson 30
Do You Have the Capacity?

Electrical capacitance of capacitors, their construction and unit, and analogue and digital capacitance measurement methods.
Lesson 31
Self-Induction Factor

Inductance of coils, its unit and construction, and traditional and microcontroller-based inductance measurement.
Lesson 32
How Powerful is It?

The concept and unit of power, calculation of electrical power, and electrodynamic power measurement.
Lesson 33
Near Magnets

Magnetic induction, magnetic field lines, the tesla unit, and measurement using magnetometers and Hall sensors.
Lesson 34
Let’s Measure Work

The relationship between electrical work and energy consumption, kilowatt-hours, and the operation of induction and digital electricity meters.
Lesson 35
Alternating Voltage

The relationship between frequency and period, the hertz unit, and vibrating-reed frequency-meter and oscilloscope measurements.
Lesson 36
Just Hard!

Measurement of material hardness using Brinell, Vickers and Rockwell methods, and digital hardness testers.
Lesson 37
Pull Harder!

Determining tensile strength with a tensile-testing machine, examination of test specimens, tensile diagram, yield strength, and elastic modulus.
Lesson 38
What’s in the Radiator?

The concepts of specific heat capacity and heat capacity, calorimetric measurement, water's heat-storage role, and calorific value.
Lesson 39
Acidic or Alkaline?

Meaning of pH, acidic and alkaline conditions, and pH measurement using indicator paper and potentiometric methods.
Lesson 40
Radiantly

Radioactive decay and activity, alpha, beta and gamma radiation, the Geiger-Müller counter, and applications of ionising radiation.