Magnetic Forces Magnitude

Magnetic Forces

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Poll

The top picture shows a bar magnet with the poles labeled N and S. The magnet was cut into two pieces-one pieces and one long piece. How should the cut end of the short piece of magnet be labeled?

• N

• S

• No label; it no longer has N or S pole on the cut end.

How is the plant floating in the air?

Watch the video!

Open Ended

How is the plant floating in the air?

Multiple Select

What objects are not attracted to magnets? (Guess if you do not know)

• Wood

• Plastic

• Rubber

• Iron

• Metal

Magnet

A piece of metal that attracts objects with iron or other metals that are similar to iron. These include the metals nickel and cobalt.

Magnetic Force

The force of attaction or repulsion created by a magnet.

A magnetic force is a noncontact force which means it can apply a force without being in direct contact with another object (it does not need to touch another object).

Multiple Choice

Nickel, cobalt, and ________ are magnetic metals.

• Iron

• Oxygen

• Sodium

• Carbon

Open Ended

Why is a magnetic force called a non-contact force?

Magnetic Pole

Is a place where the force a magnet applies is strongest. There are two magnetic poles on all magnets, (North Pole & South Pole).

Opposite poles attract.
Like poles repel.

Multiple Choice

What will happen when similar poles of two magnets are brought near each other?

• Repel or push away from each other

• Attract

Multiple Choice

What will happen when opposite poles of two magnets are brought near each other?

• Repel or push away from each other

• Attract

Magnetic Field

An invisible magnetic field surrounds a magnet. The magnetic field applies forces to other magnets or other magnetic material even when they are not in the contract.

What is happening to the iron filing in the image?

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Multiple Choice

Which of the following statements explains why magnet A appears to be floating above magnet B?

• Like poles repel each other

• Opposite poles attract each other

Multiple Choice

The person can make his toy car move using a magnet inside the box.

What name is given to a force that acts on an object without touching it?

• A non-contact force

• A friction force

• A contact force

Multiple Choice

The top picture shows a bar magnet with the poles labeled N and S. The magnet was cut into two pieces-one pieces and one long piece. How should the cut end of the short piece of magnet be labeled?

• N

• S

• No label; it no longer has N or S pole on the cut end.

Open Ended

Why do you think makes the earth have a magnetic field?

A magnetic field surrounds earth.