NGSS.MS-PS2-3

What makes a charged balloon stick to the wall?

• Protons transferred to the balloon when it was rubbed on metal.
• Extra electrons on the surface of the balloon push away electrons in the wall, leaving a positively charged area.
• The rubber in the balloon has a magnetic field that pulls on the wood in the wall.
• Electricity in the balloon creates a magnetic field that attracts the metal in the wall.

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As you move further away from an electric charge, the strength of an electric field

• Increases
• Decreases
• Stays the same
• Smiles and waves

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Where is the force of attraction the strongest on a magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

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The closer the charges, the ___________ the force between them

• closer
• further
• stronger
• weaker

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Iron and copper screws could be separated using a magnet because

• iron is magnetic, copper is not
• copper is magnetic, iron is not
• neither metal is magnetic
• copper screws are heavier than iron and fall off the magnet

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Which materials are magnetic?

• Wood

• Zinc

• Cobalt

• Aluminium

• All the Above

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When you scuff your shoes across the carpet and the air Is dry, your body picks up ________ from the carpet gaining negative charges.

• protons

• neutrons

• electrons

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In a magnet the opposite poles will ___________.

• attract

• repel

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In this picture, the iron filings show the shape of the magnetic

• axis

• core

• field

• pole

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Scientists have created trains that use magnets to make the trains float above the tracks as they travel. These trains float because

• the track is waxed

• the like poles repel

• the train has low density

• a chemical change occurs

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