CP Noncontact Unit Test

Magnetism is a

• force of attraction or repulsion.

• power that can be transferred.

• form of energy on its own.

• form of electricity.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Surrounding a charged particle is an electric field that applies a force _______.

• with direct contact of objects.

• with surfaces creating friction.

• without actually touching an object.

• without creating electricity.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Renaldo and Nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both ends of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What revisions could Renaldo and Nasreen make to increase the number of paper clips their electromagnet picks up?

• make the wire longer

• remove the nail from the center of the wire

• increase the number of loops of wire around the nail

• spread the loops of wire apart on the nail so they do not touch

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Coiling wire around an iron core and applying an electric current through the wire creates a temporary magnet called an electromagnet. What would increase the strength of an electromagnet?

• Use a smaller nail.

• Use a battery with less voltage.

• Use a battery with more voltage.

• Use fewer coils of wire around the nail.

Tags

NGSS.MS-PS2-3

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

• aluminum can

• iron nail

• copper wire

• wooden rod

Tags

NGSS.MS-PS2-5

Used car lots and metal scrap yards use electromagnets to move pieces of metal from one place to another. If the electromagnet/crane operator needed to drop a car to a new space, what would he need to do for this to happen?

• Lift the electromagnet farther away from the pile of cars.

• Reverse the magnetic field by switching the poles of the core.

• Turn off the magnetic field by switching off the electric current.

• The magnetic field can be decreased by placing it close to another electromagnet.

Tags

NGSS.MS-PS2-3

Ms. Owens assigned her students to create an electromagnet. The group that creates the electromagnet that picks up the most paper clips wins the challenge. Morgan and Gracie are very excited and begin to plan their electromagnet design. Their materials include: various batteries, different sizes of iron nails, and a large roll of copper wire. Morgan and Gracie built their electromagnet and collected data shown as shown in the graph. Morgan and Gracie won the challenge by picking up 45 paperclips. What did the winning electromagnet contain?

• A 6 V battery

• A 4.5 V battery

• A 3 V battery

• A 1.5 V battery

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

The variables _______ and _______ affect the gravitational force between objects.

• weight, mass

• volume, weight

• distance, mass

• rotation, distance

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2

Which object would have a LARGER gravitational force acting upon it?

• 5 kg block of wood

• 100 kg person

• 412 kg motorcycle

• 2540 kg elephant

Tags

NGSS.MS-PS2-4

Gravity is a force between any two objects with mass. Why doesn’t a person feel a gravitational force between him/herself and another person?

• A person doesn’t exert a gravitational force.

• The two gravitational forces cancel each other out.

• The gravitational force of people is so small it is overshadowed by that of Earth.

• There are so many people we are actually balanced by all the different gravitational forces.