Forces and Fields

Which planetary body has the GREATEST gravitational pull?

• Jupiter

• Neptune

• The Moon

• Earth

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2) Four wrestlers step on a scale for a tournament. Wrestler A weighs in at 170 pounds; wrestler B weighs in at 168 pounds; wrestler C weighs in at 171 pounds; and wrestler D weighs in at 169 pounds. Which of these wrestlers experiences the greatest force due to gravity?

• Wrestler A

• Wrestler B

• Wrestler C

• Wrestler D

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3) Gravity on the moon is about 1/6th the gravity felt on the earth. This is because

• the moon is so far away from the earth.

• the moon is much less massive than the earth.

• the earth has a molten core and the moon doesn't.

• the moon is so much further from the sun than the earth.

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4) Considering the factors that affect gravitational pull, in which location would the gravitational pull from the earth be SMALLEST on you?

• visiting friends at the beach

• visiting Santa on the second floor of the mall

• visiting Uncle Chrissy in the Himalayan Mountains

• visiting cousin Snelfu in his submarine at the bottom of the ocean

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5) The variables _______ and ________ affect the gravitational force between objects.

• weight, mass

• volume, weight

• distance, mass

• rotation, distance

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6) The circumstance MOST LIKELY to cause a compass to give an erroneous reading is standing too close to

• the ocean

• the mountain

• an electric powerline

• a heavily populated area

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Jacob floated a long steel sewing needle on a small piece of cork in a glass of water. He noticed that as he turned the glass around, the cork and needle continued to point toward his backyard. Even after he turned the small floating cork around gently, the needle finally pointed toward the backyard. What is the MOST LIKELY conclusion Jacob will draw?

• There is a large magnet in the backyard.

• Jacob’s backyard is on the north side of his house.

• The backyard is downhill from where Jacob is standing.

• A gentle breeze is causing the needle to point toward the backyard.

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The force of repulsion between two like-charged particles will increase if

• the distance between the charged particles is increased.

• the distance between the charged particles is decreased.

• the magnitude of the charge on both the particles is decreased.

• the magnitude of the charge on one of the particles is decreased.

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When a student combed his dry hair for a long time, his hair began to stand up. Which of these has MOST LIKELY happened?

• The comb and hair have become charged with similar charges.

• The comb and hair have become charged with opposite charges.

• The comb has become charged, but the hair has remained neutral.

• The hair has become charged, but the comb has remained neutral.

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