A student plans an investigation to determine whether an object has a positive charge, a negative charge, or is electrically neutral. Which statements describe procedures and the expected results that the student should follow?

Bring a balloon that has a positive charge near the object. If the balloon is attracted, the object has a negative charge.

Bring a balloon that has a negative charge near the object. If the balloon is repelled, the object is electrically neutral.

Bring a balloon that has a positive charge near the object. If the balloon is attracted, the object is electrically neutral.

An electric field gets stronger as you .

add negatively charged particles to a positively charged object

remove negatively charged particles from a negatively charged object

Normally, materials are electrically neutral because there are _____.

equal numbers of positively charged particles and negatively charged particles

more positively charged particles than negatively charged particles

more negatively charged particles than positively charged particles

equal numbers of positively charged particles and neutrally charged particles

Two negatively charged objects exert a force on each other. Describe the force between the objects, and describe two ways to increase the force between them.

The force is repulsive; increase the charge or decrease the distance.

The force is attractive; increase the charge or decrease the distance.

The force is attractive; decrease the charge or increase the distance.

The force is repulsive; decrease the charge or increase the distance.

Identify the repulsive nature of the force exerted between two objects using dimensions.

By observing the direction of the force vectors

By measuring the distance between the objects

By calculating the mass of the objects

By determining the gravitational pull between the objects

Describe two methods to increase the force between two objects. Use the dimensions* to make sense of scientific phenomena and/or to design solutions to problems.

Increase the mass of the objects and decrease the distance between them.

Decrease the mass of the objects and increase the distance between them.

Increase the mass of the objects and increase the distance between them.

Decrease the mass of the objects and decrease the distance between them.

Objects that have opposite charges

are attracted to each other, and the force between the objects pulls them together.

are attracted to each other, and the force between the objects pushes them apart.

are repelled by each other, and the force between the objects pulls them together.

are repelled by each other, and the force between the objects pushes them apart.

Can neutral objects become charged?

Yes, by being near or in contact with a charged object.

No, not under any circumstance.

What happens to the electric force between the objects when you increase the distance between a positively charged object and a negatively charged object? (Everything else remains constant.)

The electric force remains constant.

There is not enough information to answer the question.

A balloon has a negative charge. The glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

The balloon will be attracted to the rod

The balloon will be repelled by the rod

The balloon will remain in place

The balloon will spin in circles

What is the difference between a conductor and an insulator?

A conductor allows electricity to flow through it easily and an insulator does not.

An insulator allows electricity to flow through it easily and a conductor does not

An insulator is magnetic and a conductor is not

A conductor is magnetic and an insulator is not

Electric Forces

Authored by Sarah Scheer

Science

8th Grade

NGSS covered

Used 4+ times

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MATCH QUESTION

30 sec • 1 pt

Match the following charges with their corresponding particles.

Neutron

Neutral

Proton

Positive

Electron

Negative

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a property of electric forces?

They can only attract.

They can only repel.

They can both attract and repel.

DRAG AND DROP QUESTION

30 sec • 1 pt

Electric forces are strongest when objects are (a) .

Attracted

Repelled

Neutral

Charged

True or False: Electric forces can act over a distance without direct contact.

True

False

Which of the following shows that opposite charges attract?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric _________________

field

current

circuit

voltage

A material through which electrons can move easily is a (a) .

conductor

charge

insulator

magnet

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Electric Forces

Match the following charges with their corresponding particles.

Which of the following is a property of electric forces?

Electric forces are strongest when objects are (a) .

True or False: Electric forces can act over a distance without direct contact.

Which of the following shows that opposite charges attract?

The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric _________________

A material through which electrons can move easily is a (a) .

Each of the following is an example of an insulator EXCEPT (a) .

An object with equal amounts of positive and negative charge is electrically (a) .

A student plans an investigation to determine whether an object has a positive charge, a negative charge, or is electrically neutral. Which statements describe procedures and the expected results that the student should follow?

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