Know It All Friday - 8th Science - 11/13/20

Which electromagnetic waves are used in ovens and cell phone communications?

• Infrared rays
• ultraviolet rays
• microwaves

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Mechanical waves are created when a source of energy causes a medium to  _________________.

• vibrate
• expand
• move
• compress

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Any material that a wave travels through is called a ____________________.

• vibration
• compression
• medium
• crest

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In what type of wave does the medium move perpendicular to the movement of the wave?

• Transverse
• Longitudinal
• Electromagnetic
• Radio

In order to make an electromagnet stronger you __________.

• take away one power source

• wrap the wire around the rivet less times

• wrap the wire around the rivet more times

• wrap the wire around the rivet looser

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What are the components of the electromagnets?

• battery, wire and bulb

• battery , copper wire and paper clips

• battery, copper wire and iron nail

• battery, wire and aluminum

1.  An iron nail is not normally magnetic.  In an electromagnet, the iron nail can attract iron and steel.  How can a nail become magnetized in an electromagnet?

• A.  The electricity in running through the wire produces a magnetic field and magnetizes the iron
• B. The nail is a special type of nail
• C.  The paper clips will magnetize the nail
• D.   Being close to the battery magnetizes the nail

If there are two forces going in the SAME direction, you would ...?

• (-) Subtract the forces
• (+) Add the forces
• Neither
• (x) Multiply

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The FORCE that PULLS things down or back to EARTH.

• Speed
• Gravity

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A force that opposes motion

• Force
• Friction
• Gravity
• Magnetism