Gravity, Electricity, and Magnetism

Which statement correctly describes the relationship that exists between the length of a wire and the amount of current?

• Twice the length of wire allows twice the amount of current.

• Decreasing the amount of current limits the length of the wire

• Twice the amount of current occurs in half the length of wire.

• Decreasing the length of the wire decreases the amount of current.

There are three ways in which an object can become electrically charged: Which two of these methods require that the objects come into direct contact (touch), in order to transfer charges

• 1 &2

• 1& 3

• 2 & 3

Lightning is an example of objects, clouds, becoming electrically charged due to induction. When the negative charges in the cloud jump to an object containing the opposite charge, we call the sudden flow of electrons ______________

• electric generator

• sonic boom

• static discharge

• static friction

If you cut a magnet in half you will have

• Two magnets, one with a north pole only and one with a south pole only

• One half will be a magnet and the other will no longer be a magnet

• Two magnets, each with a north pole and a south pole

• Two pieces but neither will be magnets anymore

When two neutral materials are rubbed together, there is a transfer of electrical charge from one material to the other. The total electrical charge for the system _________________

• Increases as electrons are transferred

• Increases as protons are transferred

• Remains constant (unchanged) as protons are transferred

• Remains constant (unchanged) as electrons are transferred

An inflated balloon which has been rubbed against a person's hair is touched to a neutral wall and remains attracted to it. Which diagram best represents the charge distribution on the balloon and wall?

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Tags

NGSS.MS-PS2-3

Which of the following statements about gravitational fields is true?

• Gravitational fields affect objects only when two objects are touching.

• Gravitational fields affect objects only if the objects are not in contact.

• Any object that has mass is surrounded by a gravitational field: including a speck of dust, a human body, a paperclip, AND planets.

• Only very massive objects, such as Earth, are surrounded by a gravitational field.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

If two objects move away from each other. What happens to the gravitational attraction between them?

• it decreases

• it increases

• it becomes equal to zero

• it does not change

Which diagram best represents the gravitational field lines surrounding the Earth

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Tags

NGSS.MS-PS2-5

What do you call a material in which releases its electrons easily?

• conductor

• insulator

• glass

• static

Tags

NGSS.MS-PS2-3