Magnets Flashcards

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1
Q

Describe the difference between a contact and a non-contact force

A

Contact force- objects have to touch. Non-contact force- acts from a distance

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2
Q

State whether magnetism is a contact or a non-contact force

A

Non-contact

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3
Q

Define the term ‘permanent magnet’

A

a material that produces its own magnetic field

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4
Q

Define the term ‘induced magnet’

A

a material that becomes a magnet when it is placed in a magnetic field

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5
Q

State the four magnetic materials

A

iron, steel, cobalt and nickel

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6
Q

State what will happen when two like poles interact

A

repel

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7
Q

State what will happen when two opposite poles interact

A

attract

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8
Q

State where the magnetic force is strongest around a bar magnet

A

at the poles

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9
Q

Explain why the magnetic field strength is greatest at the poles

A

there are more magnetic field lines and they are closer together

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10
Q

Describe what a uniform magnetic field is.

A

same strength and same direction

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11
Q

Explain why the earth has a magnetic field

A

the movement of iron in the liquid outer core

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12
Q

Describe the shape of the Earth’s magnetic field

A

same as a bar magnet

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13
Q

State what direction compasses point

A

geographic north but magnetic south

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14
Q

Explain how compasses can be used as evidence for the Earth’s magnetic field

A

The compass needle points in the direction of the Earth’s magnetic field.

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