Magnets in Everyday Life

Which statement describes how an electric motor operates?

• a motor works by chaning the magnetic flux to change the voltage

• a motor works by electrical energy moving a charge through a loop in a magnetic field, causing the loop to rotate

• a motor works by using physical work to push a charge through a loop, generating a uniform magnetic field

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The sensor on a door for a home security system consist of a small coil wire and a reed switch. When the door opens, what characteristic of the coil changed for the home security system?

• mass and density

• ionization

• electromagnetic field

• temperature

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Large industrial magnets are used in Eddie Current Separators to process trash before burial in a landfill. Which of the following materials would be attracted to the magnet?

• electrum (gold and silver)

• polyvinyl chloride (PVC)

• steel (iron and carbon)

• textiles (cotton and polyester)

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NGSS.MS-PS2-3

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Which best describes how a magnetic energy generator functions?

• a generator changes the voltage by changing the magnetic flux

• a generator stores electrical energy and discharges it when prompted

• a generator uses physical work to rotate magnets and causes an electrical current

Automobiles use remote-controlled door locking mechanisms. The controls activate solenoid coils that then mechanically activate the lock. The electricity in the solenoid produces what type of force?

• electrostatic

• frictional

• gravitational

• magnetic

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Which of the following uses a magnetic force?

• a refrigerator with objects stuck to the door

• a calculator powered by sunlight

• a battery-operated toy car

• a table with a vase on top of it

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Which involves a conversion of electricity to magnetic forces in an automobile?

• turning the ignition key (with a chip) to on

• putting fuel in the tank

• turning on the headlights

• shifting a standard transmission

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A credit card reader decodes what type of recording on the credit card stripe?

• laser digital

• electrostatic

• magnetic

• UPC

Which action makes use of a magnetic force?

• putting a bank card in an electronic reader to purchase an item

• finding the price of an item by moving the item over a laser

• measuring your temperature by touching a thermometer to the child's head

• measuring the mass of a book using a spring scale

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NGSS.MS-PS2-3

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A Maglev Train reduces friction between a train and the track by -

• generating a north pole on the track and a south pole on the bottom of the train

• generating a north pole on the track and a north pole on the bottom of the train

• generating a north pole on the track and a negative charge on the bottom of the train

• generating a north pole on the track and a positive charge on the bottom of the train

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NGSS.MS-PS2-3

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