Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Magnets have two ends called poles: the North pole () and the South pole ().
Magnetic materials are materials attracted to a magnet. The four main magnetic metals are Iron (), Steel (an alloy of iron), Nickel (), and Cobalt ().
Non-magnetic materials, such as Aluminum (), Copper (), gold, plastic, and wood, are not attracted to magnets.
The Law of Magnetism: Like poles repel each other ( and or and push away), while opposite poles attract each other ( and pull together).
Magnetism is a non-contact force, meaning magnets do not have to touch an object to exert a force on it.
A magnetic field is the region around a magnet where the magnetic force can be detected.
📐Formulae
💡Examples
Problem 1:
A student has two bar magnets. If they point the South pole () of the first magnet toward the North pole () of the second magnet, what will happen?
Solution:
The magnets will move toward each other due to attraction.
Explanation:
In magnetism, opposite poles ( and ) create an attractive force that pulls the objects together.
Problem 2:
Which of the following items will be attracted to a magnet: a copper penny (), an iron nail (), or a plastic ruler?
Solution:
The iron nail ().
Explanation:
Iron is a magnetic material, whereas copper and plastic are non-magnetic and do not experience a force from the magnet.
Problem 3:
If you snap a bar magnet in half, how many North () poles and South () poles will you have in total?
Solution:
Two North () poles and two South () poles.
Explanation:
Every magnet, no matter how small, must have both a North and a South pole. Breaking one magnet creates two smaller, complete magnets.