S8P5 Test Gravity, Electricity, Magnetism, EM Review

Magnetism is a

• Force

• Power

• Form of Energy.

• Form of Electricity

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The Sun has more gravity than the planets in our solar system because the Sun is

• hotter

• more massive

• made of plasma

• undergoing fusion

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You can watch static electricity in action by rubbing an inflated balloon against your hair. Your hair will actually stand on its end! It does this because each hair becomes charged, and they all repel one another.

However, eventually, your hair will return to normal. Why is this?

• The charge accumulated in your hair eventually just disappears.

• The charge accumulated in your hair is eventually converted to neutral particles.

• The charge accumulated in your hair is eventually broken down by the nuclear force.

• The charge accumulated in your hair is eventually transferred to the surrounding environment.

There are three ways objects can become electrically charged. They are friction, induction and

• conduction

• Convection

• radiation

• polarization

The strength of gravity is affected by these factors. They are

• mass only

• mass and distance

• distance only

• mass and weight

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How would a bar magnet orient itself relative to this planet’s magnetic field?

• A

• B

• C

• D

A group of students is investigating the different factors that affect the strength of an electric motor. A diagram of the motor is shown.

• A. Reduce the size of the axle running through the center of the motor.

• B. Increase the number of coils of wire within the two sections of the motor.

• C. Decrease the voltage of the power source being used to operate the motor.

• D. Place the permanent magnets and coils of wire farther apart inside the motor.

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Earth's geographic North is also Earth's magnetic...

• North Pole

• East Pole

• West Pole

• South Pole

Magnets and electromagnets can both be used to pick up metal items like iron nails.

Although they are alike, there is a difference between magnets and electromagnets. An example of this is that increasing the current running through the electromagnet's wire will make it stronger.

What is another difference?

• Increasing the amount of wire loops will increase the strength of an electromagnet

• There is no other difference between electromagnets and magnets.

• Electromagnets are always stronger than regular magnets.

• Decreasing the voltage will increase the strength

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An electric generator transforms mechanical energy into electrical energy. This process could be done by which of these?

• Using wind to spin a magnet around.

• Connecting a battery to a coil of wire.

• Turning a wheel that contains electrons.

• Spinning a coil of wire near a large magnet.

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