Physics & forces explainers

📖 storybook Do heavy things really fall faster than light ones? gravitymotionair Discover

📖 storybook Why are heavy things hard to push? motionforceinertia Discover

📖 storybook How does a glass screen know exactly where your finger is? electricitysensestech Discover

📖 storybook Is it harder to START a box sliding or to KEEP it sliding? frictionforcemotion Discover

Why do your shoes grip the floor but slip on ice? frictionmotionforce Discover

📖 storybook Why can a tiny kid lift a giant grown-up on a seesaw? leversbalanceforce Discover

📖 storybook Why do tightrope walkers carry a long pole? balancemotionforce Discover

📖 storybook Does the shape of a piece of steel decide if it floats? floatingdensitypressurewater Discover

Why does a balloon get squished when you dive deep in a pool? pressurefloatingforce Discover

Why do two magnets sometimes snap together and sometimes shove apart? magnetsforcefields Discover

📖 storybook Why does a ball on a string fly off the second you let go? motionforceinertia Discover

📖 storybook Why does a moving bike stay up? balancemotionspin Discover

What happens when you blow as hard as you can between two hanging soda cans? pressureairforce Discover

What does heating do to the air in a hot-air balloon? floatingpressureheat Discover

Why does a bulb only light up when the wire makes a full loop? electricitycircuitsforce Discover

Why do holiday lights all go dark when one bulb dies, but house lights don't? electricitycircuitsphysics Discover

📖 storybook Why does rubbing a balloon on your hair make it stick to the wall? electricityforcecharge Discover

📖 storybook Why does a moving magnet make power? magnetselectricitymotion Discover

Why does a parachute let you fall slowly when a rock just drops? airgravitymotion Discover

Why is it easier to lift a heavy bucket from a well with a wheel on top? machinesforcesimple-machines Discover

Two sheets of the same paper, same weight — do they fall at the same speed? airgravitymotion Discover

Why does a wide tractor tire roll over mud that a skinny bike tire sinks into? pressureforcesurfaces Discover

Why does a roller coaster need a big first hill to make it all the way around? motiongravityenergy Discover

Why does a steel ship float when a steel marble sinks? densityfloatingshapes Discover

Why does steam puff out of a pot but you can't see it right at the spout? states of matterevaporationwater Discover

Why does a balloon stretch huge but a clay ball just splats? materialselasticitymolecules Discover

Why does a cup of mixed colored sand un-mix when you shake it? mixingmaterialssize Discover

Why does a wet sandcastle hold its shape but dry sand just slides flat? materialswaterstates of matter Discover

Why doesn't the Moon just fall down onto us? spaceorbitsgravitymoon Discover

Why do astronauts float if there's still gravity up there? spacegravityorbitsastronauts Discover

Why does cold water feel colder than cold air at the same temperature? skinsensesheatbody Discover

What does spinning do to a top that's about to fall over? balancemotionspin Discover

Why doesn't the water spill when you swing a bucket over your head? motionforcegravity Discover

📖 storybook What happens when a spinning skater pulls her arms in? spinmotionphysicsskating Discover

📖 storybook How does a thermometer know how hot it is? heatparticlesmeasuringkitchen Discover

📖 storybook Where does a helium balloon go when you let it go? airpressurefloatingsky Discover

📖 storybook How does the AC make cold air? heathomemachinesenergy Discover