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# Physics...

Below are our articles on the subject of Physics. If you can't see what you are looking for our other categories are displayed on the left under 'Our Quick Links'...
Action and Reaction: Balloons in Flight
Newton’s laws describe how things move in response to forces. Newton’s Third Law states that, "to every action there is an equal and opposite reaction."...
Bending Light: Disappearing Glass Bowl and Bending Pencil
As light passes through transparent objects, it bends. This can create optical illusions like disappearing bowls, bending pencils and mirages....
Detecting Fake Silver: Conductivity of Metal
Heat travels in three different ways - conduction (heat travelling through a solid), convection (heat travelling through liquids and gases) and radiation (heat…...
Floating and Sinking: Looking at Density
Density describes how much something weighs relating to its size, and explains why some things float on water and some sink - if something is less dense than water it…...
Friction: Keeping Warm and Keeping Rolling
Friction is the force that acts between two moving surfaces and tries to stop them moving....
Growing Stalactites and Stalagmites
Stalactites and stalagmites are formations of rock in underground caves. They are formed when calcium carbonate and other minerals dissolve in water running through…...
Keeping Warm or Cold: Insulation and Conduction
Heat travels through solids by conduction. Insulation can keep things warm and keep things cool by reducing heat transfer through conduction....
Make a Vacuum Cleaner
You won't be able to clean an entire floor with this home made vacuum cleaner, but it will give you a good idea how vacuum cleaners work....
Melting Points for Different Solids
Different solids turn into liquids (melt) at different temperatures. This temperature is described as the melting point....
Pulling and Pushing: Magnetic Attraction
Magnets are attracted to some metals, and can attract and repel each other. The earth has a magnetic field, and so magnets can be used to find directions....
Seeing Ultraviolet Light: Tonic Water in Sunlight
Ultraviolet (UV) light is an invisible part of light. It has a shorter wavelength than violet light, and its name means ‘beyond violet’. Ultraviolet light is divided…...
Solids, Liquids and Gases: Ice, Water and Steam
Solids have a fixed shape and size. Liquids can change in shape, but have a fixed size. Gases can change shape and size....
Static Electricity: Making Things Stick
Atoms contain electrons, which have a negative charge. Some electrons are fixed onto the atoms quite loosely, and can transfer from one surface to another. This build…...
Surface Tension: Keeping Bubbles Round and Insects Up
Water molecules at the surface of a glass of water are strongly attracted to each other. This creates a kind of ‘skin’ at the surface, called surface tension....
The Physics of Bubbles
Whether they are in a bubble bath or drifting on the wind, bubbles are beautiful and fun things. Try making your own to examine the amazing properties of the simple…...
Vibrations: Seeing and Feeling Sound
Sounds are created from vibrations, whether it’s a tuning fork, the reed of a musical instrument, or sound coming from someone’s voice box....
Warm and Cold: Expanding Air
As air gets warm, the molecules move around more, taking up more space. As the warm air expands, it becomes less dense so rises up and floats above cold air....
Warm and Cold: Heavy Water
Cold water is denser than hot water, because it has less energy. Cold water sinks and hot water rises....