Fareed Mohmed · Engineering · For students, Class 8–12
Physics, Visually
Don’t memorise it. Push it, drag it, watch it — then it stays with you.
12 concepts, each one a small playground. Every page follows the same five steps: Play, Try this, Remember it, See it in a machine, Check yourself. Works on a phone, no sign-up. Built by an engineer who designs real machines, so every idea ends with where it is actually used.
Speed & Acceleration
A car goes from 0 to 100 km/h in 8 seconds. How far does it travel while speeding up? Play first, then guess.
Slope tells how fast. Area tells how far.02Newton's Three Laws
Why do you lurch forward when a bus brakes, and why does a heavy truck take longer to get going than a bike?
Lazy, Loud, Linked.03Friction on a Slope
Why does a box stay put on a gentle ramp but suddenly slide when you tilt it a bit more?
Friction is a clingy friend: it holds on only up to a limit.04Projectile Motion
Why does a cricket ball curve through the air, and why would the same throw go six times farther on the Moon?
Sideways is steady, down is speeding up. Never mix them.Energy Conservation
Why does a swing slow down at the top and speed up at the bottom, and why does it eventually stop?
Height is stored, speed is spent. Total stays the same.06Levers and Pulleys
How can a child lift a heavy stone with a long stick, or one person lift a car engine with a chain hoist?
Force × distance stays the same. Trade one for the other.07Gears: Speed vs Torque
Why does a bicycle have gears, and why is a lift motor always connected through a big gearbox?
Big gear is slow and strong, small gear is fast and weak.Wave Properties
How does a wave travel across a pond without the water going anywhere, and how are sound and light waves different?
Speed = how often × how long: v = f λ.09Sound and Resonance
Why can a singer break a glass, and why does a bridge or a machine sometimes shake violently at one particular speed?
Pitch = how fast. Loud = how tall. Resonance = push at the right beat.10Reflection and Refraction
Why does a straw look bent in water, and how does light stay trapped inside an optical fibre?
Slow side, squeeze in: bend toward the normal.Ohm's Law and Circuits
Why does one dead bulb put out a whole string of old fairy lights, while in your house the other lights stay on?
V is the push, R is the squeeze, I is the flow: V = I R.12Electromagnet and Motor
How can a crane magnet switch its grip on and off, and how does electricity make a motor spin?
Current in a coil is a magnet you can switch. Current in a field feels a push: that is a motor.One line per concept. Read this before an exam; print it with your browser’s print button.
- Speed & Acceleration — Slope tells how fast. Area tells how far.
- Newton's Three Laws — Lazy, Loud, Linked.
- Friction on a Slope — Friction is a clingy friend: it holds on only up to a limit.
- Projectile Motion — Sideways is steady, down is speeding up. Never mix them.
- Energy Conservation — Height is stored, speed is spent. Total stays the same.
- Levers and Pulleys — Force × distance stays the same. Trade one for the other.
- Gears: Speed vs Torque — Big gear is slow and strong, small gear is fast and weak.
- Wave Properties — Speed = how often × how long: v = f λ.
- Sound and Resonance — Pitch = how fast. Loud = how tall. Resonance = push at the right beat.
- Reflection and Refraction — Slow side, squeeze in: bend toward the normal.
- Ohm's Law and Circuits — V is the push, R is the squeeze, I is the flow: V = I R.
- Electromagnet and Motor — Current in a coil is a magnet you can switch. Current in a field feels a push: that is a motor.