Science for ages 10 to 16
See it happen, understand why.
Science starts with looking. Vonk begins with an experiment or an observation, lets you play with it and then works towards the explanation, with an experiment you can safely do at home.
See itTry it: change the mass and the volume, and pick the liquid
ρ=
water: 1 g/cm³
Question
Why does a big block of wood float while a small pebble sinks?
Hypothesis
I think heavy things sink.
Experiment
Change the mass, the volume and the liquid.
Conclusion
Weight does not decide, density does.
No ads, no tracking, no account needed. The learning path and the first three topics are free.
Three new exercises every day, the same for everyone. Do today's starter
How a topic works
First look, then play, then understand.
Every topic has the same four blocks, always in this order. So you always know where you are.
Why
An observation or an experiment that makes you curious. Why does an ice cube float while a pebble sinks?
See it
A picture to play with: slide, pick, switch. You see it happen before you have a formula or a technical word for it.
Get it
The explanation in plain words, then the rule, and an example worked out step by step.
Do it
Exercises that are checked straight away, with a hint and the solution. And a new exercise every time.
Then you read the typical misconceptions, where you meet it in real life, an experiment for home with a safety tip, a piece of history and what to know first or learn next.
Four strands
From forces to the Moon.
Physics
4 topics
Speed, forces and balance, energy transfers and the electric circuit.
Chemistry
4 topics
States of matter, density, separating mixtures, acids and bases.
Biology
4 topics
The cell, photosynthesis, food chains and digestion.
Earth and space
4 topics
Day and night, the seasons, the phases of the Moon, the solar system and gravity.
Who it is for
For those who learn, help and teach.
For pupils
Start with what surprises you. Play with the picture until you see it happen, and practise until you feel you get it. Mistakes are information, not punishment.
Start practisingFor parents
You don't need to remember it yourself. Every topic explains it as at school, with an experiment to do together and a question to talk about at the table.
Pick a topicFor teachers
Show a picture in class, let pupils practise at their level and print a worksheet with the solutions.
Make a worksheet
For schools
For schools and teachers.
Vonk works in class without fuss: nothing to install, no pupil accounts, pictures you play with together on the board and a worksheet ready in a minute.
Worksheets with the answers
Pick a topic, a level and how many exercises. Print it, with the answers on a separate sheet.
Free for teachers
Through Kaft, teachers use Vonk for free, on the classroom screen too.
No pupil accounts
Pupils practise without logging in. What they have mastered stays on their own device.
Pictures for the board
Every topic has a picture to play with and a safe experiment, large enough to look at and do together in class.
Vonk and Kaft
A fair price, and a family of apps.
Vonk belongs to Kaft, the book cover with an app for every subject. No ads and no tracking, so you pay with money, not with your data.
What does Vonk cost?
The learning path and the first 3 topics are free. For all of Vonk, you choose one of these plans:
- All of Vonk€4 a month · €36 a year
- Kaft bundle, all apps€8 a month · €69 a year
There is also a family plan, a school plan and a free social rate.
You sign in and pay on Kaft. After that, one click opens every topic here.
All prices on KaftThe Kaft family
Each app has its own subject and its own look, with the same way of working: understanding over cramming, calm and without ads.
Pick a topic and see it happen.
Start with speed, the cell, the Moon or whatever is in tomorrow's test.