The charge on a proton is

• negative, and the charge on an electron is positive.

• positive, and the charge on an electron is negative.

• the same as the charge on an electron.

• can change according to the situation.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student has rubbed a balloon on his hair. He holds it 15 centimeters away from the wall and it falls to the floor. He holds it 5 centimeters from the wall and it is attracted to the wall and “sticks” to the wall (as shown below). Which of the following best describes what has happened?

• The electrons from his hair transferred to the balloon, causing it to be negatively charged. The positively induced wall attracted the balloon at a small distance.

• The electrons from his hair repelled the protons, causing it to be positively charged. The neutral wall attracted the balloon at a small distance.

• The protons from his hair transferred to the balloon, causing it to be positively charged. The negatively induced wall attracted the balloon at a small distance.

• The protons from his hair repelled the electrons, causing it to be negatively charged. The neutral wall attracted the balloon at a small distance.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The balloon's electric force acting upon the wall

• was proportional to the wall's force

• decreased at a close distance

• was unaffected by distance

• increased at a close distance

Tags

NGSS.MS-PS2-3

A static discharge differs from an electric current in that a static discharge_______.

• involves the movement of ions as well as electrons

• results because a force i exerted on electrons

• lasts only for a fraction of a second

• is a constant flow of electrons

Static electricity is particularly fun in the winter when wool hats are worn more regularly. Which of the following correctly explains the static electricity occurring after wearing a wool hat?

• The protons from hair are transferred to the wool cap, making the hair attracted to the air around it once the hat is removed

• The electrons from hair are transferred to the wool cap, making the hair positively charged, Therefore, the hairs repel each other and move as far away from each other as possible.

• The wool cap accumulates the protons and leaves the hair electrically negative.

• The wool cap transfers its electrons to the hair making the hair electrically positive.

Tags

NGSS.HS-PS1-1

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS2-4

Describe the changes to the magnitude of a force when the distance between charges increases. The magnitude

• is unaffected by distance

• will decrease

• will increase

Tags

NGSS.HS-PS2-4

Coulomb’s law describes the:

• magnitude of the electrostatic charge between two electric charges

• magnitude of the electrostatic force between two electric charges

• force of electrostatic charge between two warm bodies

• distance between two electrostatic charges

Tags

NGSS.HS-PS2-4

Suppose you acquire a positive charge from walking across a carpet. You then touch a doorknob and receive a shock. This leaves you

• positively charged

• negatively charged

• uncharged

• electrically neutral

The diagram above represents the electric field in the region of two small charged spheres, A and B. What is the sign of the net charge on A and B?

• A is positive and B is positive

• A is positive and B is negative

• A is negative and B is negative

• A is negative and B is positive

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5