Electricity - Reid Physical Science

A plastic rod is rubbed with a piece of wool, and a glass rod is rubbed with a piece of silk. An object is placed near the plastic rod, and an attractive force is detected. How will the object react when near the glass rod?

• A repulsive force will occur

• An attractive force will occur

• A neutralization will occur

• An electric discharge will occur

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

A scientist sets up an investigation. A positively-charged metal plate is placed in a container. The air in the container has a high concentration of floating dust. Some of the dust particles are attracted to the plate. What property is shared by the dust particles that are attracted to the plate?

• They are electrical insulators

• They are less massive than oxygen molecules

• They are negatively charged.

• They are less dense than the plate.

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NGSS.MS-PS2-5

Greg rubbed a balloon vigorously against his hair. Then he held the balloon out toward the wall. The picture shows what happened. Which best explains why rubbing he balloon against his hair made it stick 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 tot he 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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NGSS.MS-PS2-3

Bar 1 is made of glass and has been rubbed wit silk. Bar 2 is made of rubber and has been rubbed with fur. If the bars are held close to one another, why will the hanging bar move toward the held bar?

• The bars have opposite charges.

• The bars have become neutral

• Both bars have in increase in negatively-charged particles.

• Both bars have an increase in positively-charged articles.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

During a thunderstorm, Charles watched flashes of lightning through his window. Which process BEST describes the cause of the lightning?

• chemicals from different clouds combining to release energy

• radioactive atoms in the atmosphere exploding between clouds

• heat energy jumping between warmer clouds and colder clouds

• charged particles moving between positively and negatively charged parts of clouds

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NGSS.MS-PS2-5

A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this?

• gave her hair a neutral charge

• removed protons from her hair

• gave her hair a negative charge

• removed electrons from her hair.

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NGSS.MS-PS2-3

Anna notices that different types of clothing stick together when they are dried in an electric dryer. When the clothes are pulled apart, they make sparks and a crackling sound due to electric forces of attraction. How can Anna reduce the amount the clothing clings together in the dryer?

• Add a substance to the wash that reduces the number of charges transferred.

• Increase the temperature of the air in the dryer to weaken the electric forces.

• Dry more clothes at the same time so that there is less room for electric forces.

• Change the charges on the clothes by running the dryer at a faster speed.

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NGSS.MS-PS2-3

What type of charge do individual hair strands have when standing on end due to static electricity?

• neutral charges

• neutral discharge

• permanent positive charge

• temporary positive charges

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NGSS.MS-PS2-5

Three lab groups are exploring methods of charging.

Group 1 is charging a plastic comb by vigorously combing a lab member’s hair with it.

Group 2 is charging an insulated metal sphere by bringing a negatively charged metal rod into contact with the sphere, and then breaking contact between the sphere and the rod.

Group 3 is charging an insulated metal sphere by bringing a negatively charged metal rod with a wooden handle near the metal sphere (but not touching), grounding the sphere, and then removing the rod from the lab space.

Which of the following correctly identifies the method of charging for these three groups?

• Group 1 by induction, Group 2 by friction, Group 3 by conduction

• Group 1 by conduction, Group 2 by induction, Group 3 by friction

• Group 1 by friction, Group 2 by induction, Group 3 by conduction

• Group 1 by friction, Group 2 by conduction, Group 3 by induction

The circuit diagrams show four different arrangements of components. In which circuit will both bulbs shine brightly?



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NGSS.MS-ETS1-2