Bellringer 11/3: Magnetic Forces

How is an electromagnet different from a bar magnet?

• A)Bar magnets have a north and south pole, but electromagnets do not.

• B)Electromagnets are strong, permanent magnets, but bar magnets are always weaker.

• C)Electromagnets are only magnetized when a current flows through a wire wrapped around the core.

• D)Bar magnets are attracted to ferromagnetic substances such as iron. Electromagnets are attracted to all metals.

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Which item would be attracted to a magnet?

• A)a glass jar

• B)a paperclip

• C)a plastic toy cow

• D)a wooden popsicle stick

Magnetism is a

• A)force.

• B)power.

• C)form of energy.

• D)form of electricity.

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Why does a nail stick to a magnet?

• A)The nail is a magnet.

• B)The nail contains some iron.

• C)The nail weighs less than the magnet.

• D)The nail is the same color as the magnet.

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If Shane and Susan both push on a box with a force of 25N, but in opposite directions, what will happen to the box?

• A)The box will not move.

• B)The box will slide toward Shane.

• C)The box will slide toward Susan.

• D)The box will be perpendicular to both Shane and Susan.

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Based on the graph, how would you describe the net forces acting on the moving object?

• A)Net force equals zero.

• B)Net force is greater to the right.

• C)There is no way to determine net force.

• D)Net force is positive and to the right.

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