Review it - Electrostatic Forces

Which atomic particle has a negative charge?

• Proton
• Neutron
• Electron

When a substance gains more electrons, what happens to its overall charge?

• it becomes postive
• it becomes negative
• it stays neutral

Which describes why the balloons are attracted the child's hair.

• The balloons and hair are positively charged so they attract
• The balloons and hair are negatively charged so they attract
• The balloons are negatively charged and the hair is positively charged so they attract

Tags

NGSS.MS-PS2-3

In a neutral atom, the number of electrons must equal the number of

• protons
• neutrons
• subatomic particles

If two objects repel, their charges must be

• Positive and Negative
• Postive and Neutral
• Positive and Positive
• Negative and Neutral

Tags

NGSS.MS-PS2-3

If you rub a glass rod with a piece of wool, it becomes positively charged. This means it has

• Gained electrons
• Gained protons
• Lost electrons
• Lost protons

Electrostatic forces are caused by

• the balance of electrical charges on an object
• the imbalance of electrical charges on an object
• the build up of protons in the nucleus of an atom

Tags

NGSS.MS-PS2-3

Good conductors can easily lose and gain electrons. Which of the following is a good conductor?

• Balloon
• Metal
• Plastic water bottle
• skin

Which of the following is an example of static discharge?

• thunder
• lightning
• a motor
• insulators

When you rub your feet on carpet and touch something metal, you can feel (and sometimes see) the static discharge. What is happening?

• Electrons are moving to create a charge separation
• Electrons are moving to become neutral

Tags

NGSS.MS-PS2-5