write the procedure to how to make own magnetic compass by using magnetic needle , bucket of water and a small piece of thermocol
Answers
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Key concepts
Magnetism
Navigation
Magnetic poles
Physics
Forces
Introduction
Have you ever used a compass to help you figure out what direction you should go? These can come in handy to help you navigate your way through a field or forest while camping, for example. Magnetic compasses work based on Earth's magnetic field. In this science activity you'll get to make your own magnetic compass. How well do you think it'll work? Get ready to find out!
Background
People have known about magnetism for thousands of years. Magnetism is the reason two magnets will push against one another or be pulled together. This can cause amazing things to happen, such as making an object hover above the ground because it is being pushed up by the magnetic force. Magnetism can also help people navigate; because Earth has a magnetic field, compasses can be made using a small magnetized bar or needle that points a certain direction (north or south) based on the field.
Although the phenomenon of magnetism has been known of for a couple thousand years, the first magnetic compasses used for navigation were not invented until relatively recently, approximately 1,000 years ago (sometime between A.D. 1000 and 1100). In this science activity you'll get to make your own compass, which may help you understand some of the challenges that early magnetic compass makers encountered!
Materials
Metal sewing needle
A magnet (It can be a flat refrigerator magnet or a more powerful magnet, such as a rare earth magnet—the most common type is made of neodymium—which can be purchased at many hardware stores. A stronger magnet will work best.)
A pair of pliers
A cork
Scissors for cutting the corkA wide cup, drinking glass or bowl
Water