Magnets

A compass has a small balanced pointer that always points North-South. This is because

• gravity makes the needle point this way.

• the compass needle points to the cold places.

• the stars exert a force on the needle

• the earth has a magnetic field and the pointer is magnetic.

How do forces act when they are not in contact with each other?

• by touching

• by slowing down

• through fields

• by always attracting

Tags

NGSS.MS-PS2-5

Iron filings and bar magnets were placed on a sheet of paper. The following diagram shows the pattern made on the paper. ​At which location is the magnetic field the strongest?

• 3

• 4

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Look at the drawing of an experiment that requires rubbing a balloon against a surface and then against another balloon. ​Which of the following best describes what the experiment is showing?

• how helium works

• how balloons work

• how a stationary objects stops another object

• how objects with the same charge repel each other

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A balloon has a negative charge. A 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.

Tags

NGSS.MS-PS2-3

Which ones have the stronger gravity?

• More Mass

• Less Mass

• More Distance

• Less Distance

Tags

NGSS.MS-PS2-4

A student wants to show a friend that a magnetic field exists in the region around a permanent magnet.

​For demonstration listed in the table, select a check box to indicate whether the student can use the demonstration to show that a field exists in a region around a magnet.

A magnet touched to a paper clip picks it up from a table.

• Does show a field exists

• Does not show a field exists

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student wants to show a friend that a magnetic field exists in the region around a permanent magnet.

​For demonstration listed in the table, select a check box to indicate whether the student can use the demonstration to show that a field exists in a region around a magnet.

A magnet held near a small metal ball makes the ball roll across a table.

• Does show a field exists

• Does not show a field exists

Tags

NGSS.MS-PS2-5

A student wants to show a friend that a magnetic field exists in the region around a permanent magnet.

​For demonstration listed in the table, select a check box to indicate whether the student can use the demonstration to show that a field exists in a region around a magnet.

The north pole of a magnet sticks to the south pole of a second magnet when they touch.

• Does show a field exists

• Does not show a field exists

Tags

NGSS.MS-PS2-5

A student wants to show a friend that a magnetic field exists in the region around a permanent magnet.

​For demonstration listed in the table, select a check box to indicate whether the student can use the demonstration to show that a field exists in a region around a magnet.

small magnet held under a piece of paper with iron filings on top makes the filings move into a pattern that covers the whole piece of paper.

• Does show a field exists

• Does not show a field exists

Tags

NGSS.MS-PS2-5