Forces and Energy Quiz

Paper clips are made of steel wire. The picture shows paper clips around two different types of magnets. Why are the paper clips bunched at the ends of the magnet?

• The magnetic force at the poles of each magnet is strongest, so they attract more paper clips.

• The paper clips are only touching the poles, so they are not attracted to other parts of the magnet.

• Some parts of each magnet repel the paper clips, but the poles of each magnet attract the paper clips.

• There is only current flowing through the ends of each magnet.

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At a steel factory, why are machines able to sort metal objects from other objects?

• The magnets in the machine attract the metal objects.

• The magnets in the machine repels the metal objects.

• The north magnetic pole in the metal attracts the machine.

• The south magnetic pole in the metal repels the machine.

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Which of the following materials will not be picked up by a magnet?

• bolt

• nail

• piece of wood

• paper clip

How is magnetism different from gravity?

• It is much weaker than gravity.

• It is much stronger than gravity.

• It attracts objects.

• It keeps objects on Earth.

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Potential energy is _______ energy, while kinetic energy is _______ energy.

• stored, motion

• potential, kinetic

• dynamic, force

• static, energy

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A solar oven is a homemade oven that uses the sun to cook food. What form of energy can be observed?

• light energy

• heat energy

• light and heat energy

• light and sound energy

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How can potential and kinetic energy be observed in a friend pushing another friend on a swing?

• The friend on the swing has kinetic energy when their friend is pushing them gently. They have potential energy when their friend is pushing them hard.

• The friend on the swing has potential energy as they’re swinging to their highest point. It is transferred to kinetic energy when they come to a stop.

• The friend on the swing has kinetic energy when they’re pulled all the way back. It is released as potential energy once they start swinging.

• The friend on the swing has potential energy when they’re pulled all the way back. It is released as kinetic energy once they start swinging.

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Energy cannot be _______ or _______, but it can be moved from one _______ to another.

• made, destroyed, object

• lost, gained, location

• created, eliminated, energy

• manufactured, consumed, entity

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A student notices a light bulb is out on a set of string lights. The other bulbs are still lit. What kind of circuit is this?

• closed circuit

• series circuit

• open circuit

• parallel circuit

Why are you able to touch the wires when electricity is traveling through them without getting hurt?

• The electricity moves too slowly through the wires for it to hurt you.

• The rubber covering is a conductor that keeps the electricity from coming through.

• The electricity moves too quickly through the wires for it to hurt you.

• The rubber covering is an insulator that keeps the electricity from coming through.