Statics #1 (CK-12)

Which of these statements describes neutrons and electrons?

• Electrons are positive and can move, while neutrons stay in place
• Electrons are negative and can move, while neutrons stay in place
• Electrons are negative and stay in place, while neutrons can move
• Electrons are positive and stay in place, while neutrons can move

Electrons are negative and can move, while protons are positive and stay in place.

• True
• False

When opposite charges get close to each other they are repelled

• True
• False

Rubbing materials together can strip __________ from atoms

• Protons
• Electrons
• Neutrons

Which of the following is a good insulator of electricity?

• Salt water
• Copper
• Iron
• Rubber

Two spheres of the same shape and size have a charge of +5 and -3. The spheres are brought together, allowed to touch, and then separated. What is the net charge on each sphere now?

• Each sphere has a net charge of +2
• Each sphere has a net charge of +1
• One has +3, the other has no net charge
• One has +6, the other has -3

Two balls of the same shape and size have charges of +8 and -2. The balls are brought together, allowed to touch, and then separated. What is the net charge on each ball now?

• Each ball has a net charge of +2
• Each ball has a net charge of +3
• One has +6 the other has no net charge
• They both have charge 0

How does friction generate static electricity?

• Friction heats the materials, thus causing electricity
• Rubbing materials together displaces atoms, causing the sparks to fly
• Rubbing materials together can strip electrons off atoms, causing one material to become positive and the other to become negative
• Rubbing materials together causes neutrons and electrons to trade places
• None of the above

What electricity charge does an electron have

• A negative charge
• A positive charge
• A neutral charge
• May be any of the above
• None of the above

What happens when opposite charges get close to each other?

• They repel each other
• They attract each other
• Nothing happens
• They attract surrounding objects
• They repel surrounding objects