Friction is the force that acts between two moving surfaces and tries to stop them moving. Friction can be between two solids, a solid and a liquid, or a solid…
Soap is made from animal fats and vegetable oils, mixed with a caustic chemical called sodium hydroxide (also known as lye). The sodium hydroxide reacts with the oil to make…
Density describes how much something weighs relating to its size. For example, a cubic centimetre of cork weighs less (is less dense) than a cubic centimetre of lead (which is…
What is a summer without ice cream cones, or a slice of apple pie without a melting scoop of vanilla ice cream? Though it looks simple – cream, milk, sugar…
Atoms (the tiny building blocks that make everything) contain protons, which have a positive charge, and electrons, which have a negative charge. Some electrons are fixed onto the atoms quite…
Sunlight isn’t just white – it’s actually made of a mixture of different colours. As light travels through water or glass, it changes speed, which makes it bend (see ‘Bending…
Heat travels in three different ways – conduction (heat travelling through a solid), convection (heat travelling through liquids and gases) and radiation (heat travelling through empty spaces). Detecting Fake Silver:…
A tornado is a violent storm, usually with a twisting funnel of wind extending from a cloud down to the ground. The wind in a tornado is usually 40-110 miles…
Everyone is talking about climate change. As global temperatures rise, this will lead to melting of glaciers and sea ice. If this causes a rise in sea levels, this will…
