Small practice. Bright discoveries.Explore the free starter collection

Learn a little by doing a little

Make an idea click.

Move beyond an answer. Explore visual reasoning puzzles and interactive challenges across all 6 subjects, with instant rule-based verification and step-by-step explanations.

Original visual challenges
0in a rowthis session
Learning stage
Your next discovery

What belongs in each mystery box?

Every mystery box holds the same value. Make the two sides balance.

5 × ? + 666Equal values make a level balance.

0 of 7 challenge types explored at this stage

Keep the discovery going.

Turn a little understanding into a fresh page of practice.

Browse printable worksheets

Streaks count different challenges solved consecutively in this session and reset after an incorrect check. Repeating a solved question adds no points. Original rule-based practice. Age bands are guidance, not an assessment or curriculum certification.

Subject challenges
0in a row

Practise by subject and stage.

Learning stage
ScienceAges 16-18Physics (O Level): Motion, forces & energy
Question 1 of 4
Force, mass & acceleration

An object of mass 23 kg accelerates at 4 m/s². Use F = ma to find the resultant force.

Use Newton’s second law (F = ma) to calculate resultant force from mass and acceleration.

23 kg → a = 4 m/s² · F = m × a = ?
Print worksheet

0 of 4 solved in this round

Science category

Featured, challenges & worksheets in Science

Physics (O Level): Motion, forces & energyFeatured

Uniform acceleration (s = ut + ½at²)

Use the uniform acceleration equation s = ut + ½at² to calculate displacement from initial velocity, acceleration and time.

Worksheet
Physics (O Level): Waves, light & soundFeatured

Refraction & refractive index of light

Use refractive index n = λ₀ ÷ λ to calculate the reduced wavelength of monochromatic light inside an optical medium.

Worksheet
Physics (O Level): Nuclear physicsFeatured

Alpha (α) & beta (β) nuclear decay

Balance nucleon (mass) number A and proton (atomic) number Z across alpha (α) and beta-minus (β⁻) radioactive decay equations.

Worksheet