Unit 3, Static Electricity

A student is investigating what will happen when two balloons with electrical charges are brought near each other without touching. Study the table below, where + is a positive charge and – is a negative charge

In which of the following pairs of trials will the balloons repel one another?

• Trial 1 and Trial 3

• Trial 1 and Trial 4

• Trial 2 and Trial 3

• Trial 2 and Trial 4

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Cindy is wearing a wool hat. When she removes her hat, some strands of her hair stand up and move away from one another. Which of the following statements best explains why the strands of hair stand up and move apart?

• Removal of the hat causes the hair strands to become magnetized.

• Removal of the hat causes the hair strands to have different charges.

• Removal of the hat causes the hair strands to have the same charges.

• Removal of the hat causes the hair strands to create an electrical circuit.

Tags

NGSS.MS-PS2-5

Alex wants to cook some rice. He fills a pot with water and places the pot on the electric stove. In order for the rice to cook, the electrical energy from the stove must cause the water to boil. How does the energy transform for the water in the pot to boil?

• from electrical to wind energy

• from electrical to sound energy

• from electrical to thermal energy

• from electrical to magnetic energy

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

A student rubs a plastic ruler with a piece of fur, giving the ruler a negative charge and the fur a positive charge. Based on this information, which of the following statements is true?

• Only the fur will attract the neutral pieces of paper.

• Only the ruler will attract the neutral pieces of paper

• Both the fur and the ruler will attract the neutral pieces of paper.

• Neither the fur nor the ruler will attract the neutral pieces of paper.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the following energy transformations occurs when a person hears a voice through a telephone?

• Light energy is transformed into sound energy.

• Heat energy is transformed into electrical energy.

• Electrical energy is transformed into sound energy.

• Electrical energy is transformed into mechanical energy.

Tags

NGSS.MS-PS4-1

In science class, lab partners Jerry and Kelsey created a circuit by connecting a battery to a small light bulb with wires. Once they connected the wires, the light bulb turned on. Which of the following energy transformations did Jerry and Kelsey demonstrate with their circuit?

• Heat energy was changed into light energy.

• Electrical energy was changed into light energy.

• Electrical energy was changed into heat energy.

• Light energy was changed into electrical energy.

Jessica asks her mother to help her make tea. Jessica's mother puts a tea kettle full of water on the kitchen stove and turns on the stove. After about 10 minutes, the tea kettle starts to whistle. What energy transformations have taken place in the activity described above?

• sound to heat to light

• electric to sound to light

• electric to heat to sound

• electric to chemical to sound

Tags

NGSS.MS-PS3-4

The illustration below shows a balloon and a thread.

Greg rubs the balloon on his wool sweater, and the charges on the balloon separate so that there are negative areas and positive areas. Which of these statements correctly describes what happens as a result?

• The negative charges in the thread will attract negative charges on the balloon.

• The thread will straighten so that positive charges are close to positive charges.

• The thread will bend so that positive charges are far away from negative charges.

• The positive charges in the thread will move toward negative charges on the balloon.

Tags

NGSS.MS-PS2-3