Magnetism Electricity and Gravity Review

Which diagram correctly represents the direction of the magnetic field around a bar magnet?

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NGSS.MS-PS2-3

Two magnets move away from each other. What happens to the magnetic attraction between them as they become further apart?

• It decreases

• it increases

• it becomes zero

• it does not change

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A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?

• Iron

• wood

• copper

• aluminium

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There are four ways in which an object can become electrically charged:

Conduction, Induction, polarization Friction

Which two of these methods require that the objects come into direct contact (touch), in order to transfer charges

• Conduction and Induction

• Friction and Polarization

• Conduction and Friction

Lightning is an example of objects, clouds, becoming electrically charged. 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

Two negatively charged particles are 1 millimeter apart. The electric force between them is 20 Newtons. How will the amount of electric force between the particles change if the particles move closer together

• force will increase

• force will decrease

• force will stay the same

• force will disappear

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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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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.

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