Magnetism and Force Concepts

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Questions and Answers

What type of force is magnetism?

Contact force

Non-contact force (correct)

Which of the following materials can be attracted by a magnet but do not generate magnetic forces?

Cobalt

Gold (correct)

Iron

Paper (correct)

Nickel

Platinum

Which of the following factors are associated with forces?

Color

Direction (correct)

Magnitude (correct)

Shape

What is the unit used to describe forces?

Newtons (N) Signup and view all the answers

Which of the following are examples of non-contact forces?

Gravity Signup and view all the answers

What are magnets?

Magnets are special objects that generate magnetic forces. Signup and view all the answers

What can magnets push or pull on?

Both A and B Signup and view all the answers

What are neodymium magnets?

Neodymium magnets are very strong magnets, particularly for their small size. Signup and view all the answers

What are magnetic materials?

Magnetic materials are special materials that can be attracted by magnetic forces but do not generate their own magnetic forces. Signup and view all the answers

What is an alloy?

An alloy is a metal that is made of a combination of metals. Signup and view all the answers

All magnets have a south pole and a north pole.

True Signup and view all the answers

What is the difference between a permanent magnet and a bar magnet?

A bar magnet is a type of permanent magnet. Signup and view all the answers

What happens when like poles of two magnets are held together?

The magnets repel each other. Signup and view all the answers

What happens when opposite poles of two magnets are held together?

The magnets attract each other. Signup and view all the answers

What is magnetisation?

Magnetisation is the process of turning a magnetic material into a magnet. Signup and view all the answers

Which of the following best defines the term 'magnet'?

A material that always generates a magnetic force Signup and view all the answers

What will happen when two magnets are brought together, with a north pole facing a south pole?

They will attract Signup and view all the answers

What will happen when two magnets are brought together, with a south pole facing another south pole?

They will repel Signup and view all the answers

What will happen when two magnets are brought together, with a north pole from one magnet facing a north pole from the other?

They will repel Signup and view all the answers

What is the rule for magnets attracting and repelling?

Opposite poles attract each other, and like poles repel each other. Signup and view all the answers

Why does a magnet hanging on a thread respond to magnetic forces more easily than a magnet laying on a bench?

A magnet hanging on a thread is free to rotate and align itself with the magnetic field, while a magnet laying on a bench can only move in one direction. Signup and view all the answers

What would be a better explanation of the behavior of magnets than 'magnets stick together'?

'Magnets attract or repel each other depending on the polarity of the poles they are brought together with'. Signup and view all the answers

Give an example of a contact force and a non-contact force.

A contact force example is friction, while a non-contact force example is gravity. Signup and view all the answers

Study Notes

Magnetism

Magnetism is a force, a push or pull, that affects objects without touching them.
This is called a non-contact force.
Many everyday items use magnetism, from computers to cars.
Magnetism is a force measured in newtons (N).
The stronger the force, the higher the number of newtons.
Magnets have a north and south pole.

Learning Objectives

Understanding magnetic attraction and repulsion.
Applying the concept of poles and the laws of attraction and repulsion.
Predicting magnetic pole effects.

Force

A force is a push or pull applied to an object by another object.
Forces have magnitude (size) and direction.
Forces are represented by arrows; the length of the arrow shows the force's magnitude, and the direction the arrow points shows the direction of the force.
The unit for measuring force is the newton (N).

Magnetism as a Non-Contact Force

Magnets exert forces on objects without touching them.
This is an example of a non-contact force.

Magnetic Materials

Certain materials (e.g., iron, nickel, cobalt) are attracted to magnets.
These are called magnetic materials.
These materials can be attracted to a magnet, but they do not generate magnetic forces themselves.
An alloy is a combination of metals, and some alloys of iron, nickel, and cobalt are also magnetic.

Permanent Magnets

Permanent magnets retain their magnetic force.
Like poles of magnets repel each other.
Unlike poles of magnets attract each other.

3-Minute Task

Recall: Magnetism is a non-contact force.
Magnetism vs other material: Identify materials that can be attracted by a magnet but do not create their own magnetic field.
Force factors: Identify features associated with forces (magnitude, direction, shape, color).
Units of force: The unit of force is the newton (N)
Examples of non-contact forces: magnetism, gravity.

Homework

Describe how magnets attract and repel.
Describe what happens when a magnet approaches other types of materials (iron, copper).
Explain why a hanging magnet responds to magnetic forces more easily than a magnet laying on a surface.

Contact vs Non-Contact Forces

Contact forces require physical touch between objects (like pushing a box).
Non-contact forces affect objects without touching them (like gravity or magnetism).

Earth's Gravitational & Magnetic Forces

Explain similarities and differences between Earth's gravity and magnetism.

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Description

This quiz covers the fundamental concepts of magnetism and force. Learn about magnetic attraction, repulsion, and the significance of magnetic poles. Understand how forces are measured and represented, enhancing your grasp of non-contact forces in everyday life.