Physical Science Unit 1 Force Fields Review

According to Newton’s law of universal gravitation, which 2 statements are true?

• As we move to higher altitudes, the force of gravity on us decreases

• As we move to higher altitudes, the force of gravity on us increases.

• As we gain mass, the force of gravity on us decreases.

• As we gain mass, the force of gravity on us increases.

• As we move faster, the force of gravity on us increases.

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An unmanned spacecraft leaves for Venus. Which 2 statements about the spacecraft’s journey are true?

• The weight of the spacecraft keeps changing.

• The mass of the spacecraft keeps changing.

• The weight of the spacecraft remains the same.

• The mass of the spacecraft remains the same.

• The gravitational pull on the spacecraft remains the same.

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Antonio is holding a 1-pound bag of apples in his left hand and a 2-pound bag of apples in his right hand. Which 2 sentences about this situation are true?

• The force caused by gravity is the same on each bag.

• Antonio is applying a 1-pound force to hold the 1-pound bag.

• Antonio must apply a greater force to hold the 1-pound bag than the 2-pound bag.

• The acceleration due to gravity is greater on the 2-pound bag.

• The mass of the bag in his left hand is less than the mass of the bag in his right hand.

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The image shows positions of the Earth and the Moon. In which region would an astronaut feel the lightest?

• A

• B

• C

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Based on Newton’s law of universal gravitation, when mass increases

• Gravity increases

• Gravity decreases

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Based on Newton’s law of universal gravitation, when distance between objects increases

• Gravity increases

• Gravity decreases

A silk cloth gains electrons when rubbed over a glass rod. A different glass rod gains electrons when rubbed with rabbit fur. What will happen if the two charged glass rods approach one another and why?

• The rods will repel each other because they have unlike charges.

• There will be no reaction between the rods.

• The rods will attract each other because they are both positively charged.

• The rods will attract each other because they have unlike charges.

• The rods will repel each other because they have like charges.

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When people use plastic combs on their hair, the combs become negatively charged. Which 2 statements about this situation are true?

• The comb loses electrons.

• The comb gains electrons.

• The hair loses electrons.

• The hair gains protons.

• The hair loses protons.

Two magnets are placed as shown in the image.

Where is the force of attraction at a maximum?

• Between poles A and C

• Between poles A and D

• Between poles B and D

• Between poles B and C

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Which materials are magnetic?

• Steel

• Iron

• Nickel

• Cobalt

• All of these are magnetic

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