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Energy
The capacity of a system or a body to do work. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract concepts...
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Centripetal Force: The Force Keeping an Object on a Circular Path
The inward-pointing force that keeps an object moving in a circular path. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Motor effect
The force experienced by a current-carrying wire when placed within a magnetic field. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
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Surface tension
The cohesive force that occurs at the surface of a liquid, due to the attractive forces between molecules. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Buoyancy: The Forces That Determine Why Objects Float or Sink
Discover the forces at work underwater, which dictate why large boats float but small pebbles sink. Physics - Forces - Learning Points. The buoyant force is an upward-acting force determined by the weight of the displaced water. Ships...
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Rollercoasters
Journey through a rollercoaster ride to find out which forces are at work to create this theme-park thrill. Physics - Forces - Learning Points. Rollercoasters do not have engines. Rollercoasters use forces. Electromagnets are used along...
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Levers, Wheels, Pulleys
There are only six basic types of machine. Discover more about levers, wheels and pulleys: what are they and why are they useful? Physics - Forces - Learning Points. Archimedes designed simple machines to move and lift objects. The...
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Coastal Processes: Waves
Coastal features around the world vary hugely. How do waves contribute to shaping coastlines? Earth Science - Geology - Learning Points. Waves are created by wind. Waves vary in size and strength. Waves break in shallow water....
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Centripetal Force: How Central Forces Cause Objects to Spin or Turn
What are central forces and how do they make objects spin or turn? Physics - Forces - Learning Points. A centripetal force makes an object follow a circular path. The moment of inertia is the resistance of an object when the speed of...
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Maglev Trains
Why using magnets, not wheels, allows this train to defy gravity and reach record speeds without an engine. Physics - Electricity And Circuits - Learning Points. The Maglev train in China does not have an engine. Instead it uses...
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Pressure and Surface Area
Learn how surface area can affect the amount of pressure exerted, and why this is useful in life? Physics - Forces - Learning Points. Pressure is the amount of force acting on a set area. Pressure is measured in pascals. Pressure can be...
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Red Hot: Emergency Stop
Revealed: the tremendous heat created and energy 'lost' when cars brake. Physics - Energy And Radioactivity - Learning Points. Car brakes convert kinetic energy into heat energy. When you press the car brake pad a system of levers and...
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Factpack: Pressure and Altitude
Changes in pressure at different heights, from outer space to the depths of the ocean. Physics - Forces - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention at...
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Factpack: G-Force
Chart G-Force up the scale, from standing still to the greatest G-force ever. Physics - Forces - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention at the start...
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Factpack: Experience Friction
An interactive demonstration of how friction is created, and its effects. Physics - Forces - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention at the start of a...
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Plant Transport
How does a tall tree draw water from its roots to its leaves? And how does food made in leaves reach the rest of a plant? Discover how plants transport resources via the xylem and phloem. Biology - Plants - Learning Points. Transpiration...
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Place Like Home: Cassini
The enormous challenge of building a probe capable of travelling over 1 billion kilometres to reach Saturn's moon, Titan. Physics - Universe - Learning Points. Huygens probe was designed by the European Space Agency at a cost of £400...
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How Do Animals Fly?
Biological evolution has allowed some animals to fly. Find out exactly how their wings work to achieve this. Physics - Forces - Learning Points. Flight occurs when the upward force is greater than the downward. Flight is explained by...
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Intermolecular Forces
Discover the role played by intermolecular forces in changing the state of matter between solid, liquid and gas. Chemistry - Atoms And Bonding - Learning Points. Intermolecular forces are the attractive forces between molecules....
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Terminal Velocity
If a skydiver jumps out of a plane, when will they stop accelerating? Competing physical forces hold the answer. Physics - Forces - Learning Points. Terminal velocity is the maximum constant velocity. Terminal velocity increases with...
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Black Holes
Discover how dying stars transform into black holes, areas of mass so great that even light can't escape. Physics - Universe - Learning Points. When a star dies, it collapses and condenses into a single point, known as a singularity. The...
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Yosemite's Valleys
The landscape of this national park was shaped by ice - carving the valleys, waterfalls and sheer cliffs that attract tourists from all over the world. Earth Science - Geology - Learning Points. Glacial ice has reshaped the landscape of...
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Machines: Building the Pyramids
It was thought the Egyptians used only manual labour to build some of the Wonders of the World. Now it is though they could have used simple machines. Physics - Forces - Learning Points. It is believed that the Egyptians constructed the...
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Fighter Pilots: G-Force
Changes in acceleration pose an extreme risk for fighter pilots. Find out how they train to avoid blacking-out during flights. Physics - Forces - Learning Points. Fighter pilots undergo training to allow them to cope with G-force....