A-Level Physics

22:04 Topic 1 Physical Quantities & Units In 1999, a spacecraft reached Mars after a journey of ten months. It had cost over three hundred million… 20:32 Topic 2 Kinematics In 1971, an astronaut stood on the Moon and held out a hammer and a feather. On Earth, the feather would… 20:03 Topic 3 Dynamics In the empty vacuum of space, there is nothing to push against — no ground, no air, nothing at all. And … 17:06 Topic 4 Moments & Pressure The Leaning Tower of Pisa has tilted for over eight hundred years — yet it does not fall. Why? The whole… 17:09 Topic 5 Work & Energy A roller coaster has no engine on its track. A chain hauls it up the very first hill — and after that, i… 16:50 Topic 6 Deformation A bungee jumper steps off a bridge and falls — faster and faster, straight toward the ground. Then, at t… 16:46 Topic 7 Waves You are standing on a street corner. An ambulance races toward you, siren wailing at a high pitch — and … 19:48 Topic 8 Superposition Put on a pair of noise-cancelling headphones, and the roar of a plane engine fades to silence. But here … 17:50 Topic 9 Electric Current Flip a switch, and the light comes on instantly. So the electrons must be racing through the wire at the… 20:35 Topic 10 Practical Circuits Here is an old battery, and a voltmeter says it is still full: nine volts. Yet connect it to a bulb, and… 19:01 Topic 11 The Nuclear Atom Over a hundred years ago, physicists fired tiny alpha particles at a sheet of gold foil, thinner than pa… 13:00 Topic 12 Circular Motion Fill a bucket with water, swing it in a fast circle over your head — and not a drop falls out, even when… 12:15 Topic 13 Gravitational Fields An apple falls from a tree. The Moon sails around the Earth. For thousands of years, no one saw any conn… 11:46 Topic 14 Thermal Physics Touch a metal spoon, then a wooden table, in the same room. The metal feels much colder. So it must be c… 13:48 Topic 15 Ideal Gases Hold up a single glass of water. It looks simple enough. But inside it are more molecules than you could… 15:27 Topic 16 Internal Energy Pump up a bicycle tyre, quickly and hard, and something surprising happens: the pump gets hot. Warm enou… 15:13 Topic 17 Oscillations & Simple Harmonic Motion In 1940, a brand-new bridge opened across the Tacoma Narrows — long, elegant, and, as it turned out, dan… 11:03 Topic 18 Electric Fields Deep inside a storm cloud, charge is building. Negative charge gathers at the base, positive charge on t… 14:49 Topic 19 Capacitance Look closely at a camera flash. Before the picture, a tiny part hums and whines for a second — you might… 13:21 Topic 20 Magnetic Fields High above the poles, the sky comes alive — sheets of green light, rippling in the dark. This is the aur… 11:18 Topic 21 Alternating Current The electricity in your wall is restless. Fifty times every second — sometimes sixty — it reverses direc… 15:44 Topic 22 Photons Here is a puzzle that broke classical physics. Shine the brightest red lamp you can find onto a metal pl… 13:08 Topic 23 Mass-Energy Equivalence Look up at the Sun. Every single second, it turns four million tonnes of itself — gone, vanished — into … 17:14 Topic 24 Ultrasound & Medical Imaging The very first photograph of your life was probably taken with sound. Before you were born, a doctor pre… 12:42 Topic 25 Luminosity & the Cosmos That star is a hundred trillion kilometres away. You will never touch it. You will never visit it. And y…