compass
Definition
A compass is a magnetic device that indicates the direction of the magnetic north.
It has a magnetized needle that is free to rotate on a pivot.
The needle aligns itself with the Earth's magnetic field, which is why it always points north.
Compasses are used for navigation, and they are also used in many other applications, such as surveying and orienteering.
How can the word be used?
The sailor used a compass to navigate his way through the fog.
Different forms of the word
Noun:
Compass: A device used to determine direction.
Compass: A set of lines or points that indicate directions on a map or other flat surface.
Adjective:
Compass: Of or relating to a compass.
Verb:
To navigate using a compass.
To point in a certain direction.
Etymology
The word "compass" comes from the Latin word "compassus", which means "to go around". It is made up of the prefix "com-", which means "together", and the verb "paene", which means "to go".
Question
Why is a compass useful?
AQA Science Exam Question and Answer
Question:
What is the purpose of a "compass" in the context of navigation, and how does it work?
Answer:
A compass is a navigational instrument used to determine direction and orientation with respect to the Earth's magnetic field. It consists of a magnetized needle or a magnetic card, typically floating in a liquid-filled housing, aligned with the Earth's magnetic North and South poles.
The compass works based on the principle that the Earth has a magnetic field, with the magnetic North Pole located near the geographic North Pole. The needle or magnetic card in the compass aligns itself with the Earth's magnetic field, pointing towards the magnetic North. Consequently, the other end of the needle or card points towards the magnetic South.
Using a compass, travellers, hikers, and sailors can easily find their way and maintain a sense of direction even when landmarks are not visible or during overcast conditions. By aligning the compass needle with the North-South direction, they can determine other directions, such as East and West, and navigate accurately to reach their desired destination.
In summary, a compass is a navigational tool that helps determine direction by aligning with the Earth's magnetic field. By pointing towards the magnetic North, it aids in navigation and orientation, making it an essential tool for outdoor activities and travel.