Unit 9 Study Guide 23-24

Two new planets are discovered, planet X and planet Y. The planets have identical volumes, but the mass of planet X is two times greater than the mass of planet Y. If two identical space ships land on each planet, which of the following will be true?

• The mass of the space ship on planet X will be greater than the mass of the space ship on planet Y.

• The weight of the space ship on planet X will be greater than the weight of the space ship on planet Y.

• The mass of the space ship on planet Y will be greater than the mass of the space ship on planet X.

• The weight of the space ship on planet Y will be greater than the weight of the space ship on planet X.

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In which of the following diagrams would the gravitational attraction be the greatest?

• 
• 
• 
• 

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Electric charges that are different ​​ (a)   each other.   What charge does an electron have? ​ (b)  

  If a substance loses electrons so that it has more protons than electrons, what type of charge does it have? ​ (c)  

   

• attract
• negative
• positive
• repel

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What will happen if you rub a balloon on a wool sweater?

• Protons from the sweater will rub off on the balloon and the balloon will become negatively charged.

• Electrons from the sweater will rub off on the balloon and the balloon will become negatively charged.

• Electrons from the sweater will rub off on the balloon and the balloon will become positively charged.

• Protons from the sweater will rub off on the balloon and the balloon will become positively charged.

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Why do you build up a static charge when you rub your shoes across the carpet?

• Protons rub off of the carpet and onto your shoes.

• Electrons rub off of your shoes and onto the carpet

• Protons rub off of your shoes and onto the carpet.

• Electrons rub off of the carpet and onto your shoes

A positively charged rod is brought close to one end of a neutral metallic plate as seen below. What type of charge is induced on the right side of the plate?

• negative

• neutral

• mixed charges

• positive

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A neutral electroscope is touched with a positively charged rod. After the rod is removed the electroscope is charged positively because of:

• friction

• conduction

• induction

• photoemission

Which of the following makes a good electrical insulator? Why?

• Glass, copper and wood, because electrons move freely inside them.

• Glass, because it is slippery and smooth.

• Copper because it is metal

• Glass, wood and plastic because electrons cannot move freely inside them

A conductor is a ______.

• electric current

• magnet

• material that current cannot pass through easily

• material that current can pass through easily

What kind of magnets repel each other? (check all that apply)

• South pole to south pole

• South pole to north pole

• North pole to south pole

• North pole to north pole

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