Unit13: Invisible Forces

Which of the following are magnetic materials?

a) Aluminum

b) Copper

c) Iron

d) Nickel

• a) and b)

• c) and d)

• a) only

• a), b), c) and d)

What are the two distinct poles of a magnet called?

• North and East

• South and West

• North and South

• East and West

What happens when two like poles of magnets are brought close together?

• They attract each other

• They repel each other

• They stick together

• They rotate around each other

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Which direction does a freely suspended magnet align itself in?

• East-West

• North-South

• Up-Down

• Random direction

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Which of the following materials are strongly affected by magnetic fields?

• Aluminum

• Copper

• Wood

• Cobalt

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What do magnetic field lines represent?

• The density of a magnetic field

• The temperature of a magnet

• The length of a magnet

• The strength and direction of a magnetic field

Which pole of a magnet aligns with the Earth's magnetic North Pole?

• North Pole

• South Pole

• East Pole

• West Pole

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What force causes objects to fall towards the ground?

• Magnetic force

• Gravitational force

• Repulsive force

• Electrostatic force

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How is weight different from mass?

• Mass is the amount of matter in an object, while weight is the force of gravity acting on it.

• Weight is measured in kilograms, while mass is measured in Newtons.

• Weight is constant everywhere, while mass can vary.

• Mass is the pull of gravity on an object, while weight is the measure of its inertia.

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How is the force of gravity measured?

• In kilograms (kg)

• In Newtons (N)

• In meters per second (m/s)

• In joules (J)