Force and Motion Review

Three point charges are configured as shown below. Which statement explains the interactions of these charges?

• X exerts a force on Y to the left; Z exerts a force on Y to the right.

• X exerts a force on Y to the right; Z exerts a force on Y to the left.

• X exerts a force on Y to the left; Z exerts a force on Y to the left.

• X exerts a force on Y to the right; Z exerts a force on Y to the right.

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If you know the distance an object has traveled in a certain amount of time, you can determine the object's __________.

• speed

• velocity

• acceleration

• position

A negative charge is projected with velocity, v, through two oppositely charged metal plates as shown. Which line best represents the path the negative charge will take?

• A

• B

• C

• D

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Where something is located.

• Rest

• motion

• position

• energy

Greg rubbed a balloon vigorously against his hair. Then he held the balloon out toward the wall. The picture shows what happened next.

Why is the balloon sticking to the wall?

• The gas that kept the balloon inflated made it float until it came in contact with a hard surface.

• Natural oils in his hair transferred to the balloon and gave it a sticky quality.

• The charges between the balloon and the wall were opposite.

• The balloon and the wall were both positively charged.

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Motion can be described through a change in (a)   .

• speed

• distance

• position
• time

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Select all of the factors that affect the strength of an electromagnet. Check all that apply.

• number of times the wire is looped around the core

• size of the object being attracted by the core

• amount of material in the core

• type of material in the core

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How did passing a comb through her hair allow the comb to bend the stream of water?

• by making the comb more absorbent

• by giving the comb an electrical charge

• by increasing the thermal energy of the comb

• by breaking some of the chemical bonds in the comb

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What is displacement?

• how far an object is from its starting point

• the total length of an object's path

• weight that is displaced from a body of water

• the change in an object's path

Which of the following does NOT affect the strength of an electromagnet?

• number of times the wire is looped around the core

• size of the object being attracted by the core

• type of material in the core

• amount of material in the core

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