Week 19 Practice:Geomagnetism (G)

What creates Earth's magnetic field?

• Movement of molten iron in Earth's outer core

• Movement of water in Earth's oceans

• Rotation of Earth on its axis

• Gravitational pull of the moon

What happens when two magnets with field lines in the same direction are close to each other?

• They attract each other

• They repel each other

• They have no effect on each other

• They create a new magnetic field

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Where are Earth's magnetic poles located in relation to the geographic poles?

• Close to the geographic poles

• Exactly at the geographic poles

• Far from the geographic poles

• At the equator

What is the role of Earth's magnetic field?

• Protects us from harmful space particles

• Helps in the growth of plants

• Controls the weather patterns

• Determines the length of a day

What guides compasses to point towards the magnetic North Pole?

• Magnetic field lines

• Gravitational force

• Wind direction

• Sun's position

Are these magnets attracting or repelling

• attracting

• repelling

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Are these magnets attracting or repelling

• attracting

• repelling

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What is the velocity of car B in this graph

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A 1335 kg rocket speeds toward the moon with a velocity of 80 m/s, how much kinetic energy does the rocket have.

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In an exciting experiment, we can explore how the size of magnetic field lines affects the strength of a magnet. A claim we can make is that larger magnetic field lines indicate a stronger magnet. For example, if we measure the strength of a magnet at different distances, we might find that a magnet with a larger field size can lift a paperclip from 5 centimeters away, while a smaller magnet can only lift it from 2 centimeters. This shows that as the size of the magnetic field lines increases, the strength of the magnet also increases. The reasoning behind this is that larger field lines create a more substantial area of influence, allowing the magnet to attract objects from a greater distance. By conducting such experiments, we can better understand the power and behavior of magnets in our daily lives.

What reasoning is used in the above experiment to explain the evidence?

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