Join junior scientist Jack as he builds an electromagnet using a D-sized battery, coated copper wire, a nail file and some metal nails. Electromagnets are created when an electrical current is passed through a tightly wound coil, causing an electromagnetic field. Being able to control the magnetic field, by changing the amount of electricity passing through the coil, gives the user the ability to turn it on or off at will, and making it advantageous over the permanent magnet.
Junior scientist Brittany teaches us how to make a hologram. Making holograms, or 3D images, is easy and all you'll need is a smartphone, a pen, a sheet of clear plastic, scissors, clear tape, graph paper and a ruler. Once you have made your reflective prism, visit the Scope website to make a video for your hologram or find one online.
Infrared light is a form of electromagnetic radiation that has longer wavelengths than the spectrum visible to the human eye, but just because we can't see it doesn’t mean it's not there. Join junior scientist Nicholas as he explains how to test for this very elusive light and its radiant energy. To conduct this experiment at home or school, you'll need a glass prism, two thermometers, a black marker, scissors, a box with a white paper base and a notepad for recording your results.
Questacon's Patrick Healan demonstrates how a balloon bursts in different ways depending on where you try to pop it, all in slow motion, revealing how pressure makes a difference, and how a spark makes a hydrogen balloon explode in flames.
Questacon's David and Sam demonstrate how a flame tube responds to the different sounds effect flames emitted from a perforated gas-filled tube, revealing the relationship between sound waves and pressure, as a kind of "flaming graphics equaliser".
Natalie's in the middle of the Monster Trucks today! Races, jumps, wheelies, backflips -- freestyle thrills galore! The drivers seem always to walk away from some devastating crashes. Nat helps with the judging, and in interviewing young fans, she notes the crazier and cooler the stunts -- the higher the score!
Scott meets Melody Yang, bubble scientist! The mesmerizing magic turns Scott and all of us to children again. The light show, colours, bubble shapes -- all is scientific and depends a lot on how moist or dry the air is. You'll appreciate the awesome beauty and artistry of this video!
Leela investigates the unique noise cuckoo clocks make. She interviews Justin Lang, who is a cuckoo clock servicer by profession. These German, handcarved creations are all unique and are the 'cuckoo' sounds in them. We learn that the sound from the actual bird in the German forests was a 'good luck' signal for hunters.
Today we meet Cooper, who shows us sweet moves with his radio-controlled car. The main manoeuvre -- to pass everyone on those tight curves -- is "The Glide". Momentum, speed, and a hard pull on the throttle gets it done, and could fire up a good physics lesson for your class.
Will a medicine ball or a basketball hit the ground first when dropped at the same time from the same height? In this clip, Catalyst's Dr Derek Muller investigates what influences the speed at which objects fall. Derek challenges some people in a market to make a prediction and explain their thinking, before he finally conducts the experiment and delivers the scientific explanation.
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