CSA 8.PS2.5 ESSENTIAL STANDARD

You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to

• a piece of metal.

• positively charged hair.

• the neutrally charged wall.

• another negatively charged balloon.

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DOK1

The two force diagrams shown here best support which of these hypotheses?

• Earth is a giant magnet.

• Opposite poles of a magnet attract.

• Magnet materials are iron, steel, nickel and cobalt.

• Horseshoe-shaped objects tend to possess magnetic properties.

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DOK1

Which magnets will move towards each other?

• 
• 
• 
• 

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DOK1

Which set of magnets correctly illustrates the attraction of unlike poles?

• Set A

• Set B

• Set C

• Set D

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DOK2

The force of repulsion between two like-charged particles will increase if

• the distance between the charged particles is increased.

• the distance between the charged particles is decreased.

• the magnitude of the charge on both the particles is decreased.

• the magnitude of the charge on one of the particles is decreased.

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DOK2

When a plastic ball is rubbed with fur, the plastic ball attracts a positively charged pith ball. When a glass rod is rubbed with fur, the glass rod repels the same pith ball. Based on these two observations, which of these will MOST LIKELY gain electrons more readily?

• fur

• glass

• plastic

• plastic and glass

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DOK2

During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move down into the gold leaves, giving the electroscope an overall positive charge. The positive leaves repel. The same process occurs when a negative rod is brought close to the electroscope. This time, the negative charges flow through the electroscope to the leaves. The leaves, once again, repel. Whether the charge is positive or negative, in each case, the experiment shows that

• like charges repel.

• opposite charges repel.

• friction produces current.

• electrons produce a current.

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DOK2

Jacob floated a long steel sewing needle on a small piece of cork in a glass of water. He noticed that as he turned the glass around, the cork and needle continued to point toward his backyard. Even after he turned the small floating cork around gently, the needle finally pointed toward the backyard. What is the MOST LIKELY conclusion Jacob will draw?

• There is a large magnet in the backyard.

• Jacob’s backyard is on the north side of his house.

• The backyard is downhill from where Jacob is standing.

• A gentle breeze is causing the needle to point toward the backyard.

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DOK3

Anna learned that every magnet has a north and a south end called poles. She notices that when she puts the north end of a magnet near the south end of another magnet, they pull together. What can Anna conclude from her observation?

• Opposite poles of magnets repel.

• Opposite poles of magnets attract.

• The north pole picks up iron nails.

• Only the north pole has an attractive force.

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DOK3

If the bar magnet on the left were broken in half, what statement correctly predicts how the two halves of the magnet would react to the magnet on the right?

• Neither halves of the broken magnet would be attracted to the magnet on the right because a magnet must have two poles.

• The two halves of the broken magnet would be attracted to each other, but neither would be attracted to the magnet on the right.

• Only the right side of the broken magnet would be attracted to the magnet on the right since it contains the south-oriented magnetic domains.

• The right side of both halves would be attracted to the magnet on the right since the south pole of each half would be facing the north pole of the other magnet.

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DOK3