Class 9 science simulations

Chapter 1: Matter in Our Surroundings

• Diffusion: A drop of dye in still jelly: how does it spread with nothing stirring it?
• Gas Laws: Squash a gas with a piston, or heat it: how does its volume change?
• States of Matter: Solid, liquid, gas: the same molecules, just jiggling harder.

Chapter 2: Is Matter Around Us Pure?

• Crystal Growth: Grow a salt crystal on a thread: why does it come out as a neat cube?
• Solutions: How much can you dissolve in a glass of water, and does warming it help?

Chapter 4: Structure of the Atom

• Atomic Orbitals: Where is the electron? Look for it again and again, and a shape appears.

Chapter 5: The Fundamental Unit of Life

• Cell Division: One cell becomes two. How does each new cell end up with a full set of chromosomes?
• Osmosis: Water moves through a thin skin towards the sugary side. Can it push itself uphill?

Chapter 6: Tissues

• Muscle Contraction: Your biceps bends your arm. How hard does it really have to pull to lift a dumbbell?

Chapter 7: Motion

• Roundabout Ride: Spin the roundabout. How hard must the spring pull to keep the toy going round?
• Slide and Light Gates: Let a toy sled slide down a slide. How fast does it pick up speed?

Chapter 8: Force and Laws of Motion

• Crashing Carts: Two carts crash on a track. Where does the push go?
• Aerodynamics: Blow air over a wing. How fast before it lifts its own weight?

Chapter 9: Gravitation

• Ocean Tides: Why does the sea come in and go out twice a day?
• Orbital Mechanics: Newton's cannonball: how fast must you fire it sideways so it never lands?
• Solar System: A desk orrery run by real gravity: why does Mars take longer than Earth to go round?
• Hydraulics: Push a little piston gently. Can the oil lift a heavy crate?

Chapter 10: Work and Energy

• Bouncing Balls: Drop a rubber ball from 30 cm. How high does it come back?

Chapter 11: Sound

• Sonar & Echolocation: Ping the water and listen. How long until the rock answers?
• Sound Waves: A speaker squeezes the air. Watch the squeezes march across the stage.
• Wave Motion: Shake one end of a cord. How fast does the wave run, and how long is each wave?
• Wave Reflection: Ripples hit a tilted wall. Which way do they bounce?

Chapter 12: Improvement in Food Resources

• Nitrogen Cycle: Air is mostly nitrogen, yet crops run short of it. How does nitrogen get into plants, and where does it go?

More labs

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