Hmh Magnetic Forces

The attractive force between two magnets increases. Which statement explains why this would happen?

• The unlike poles of the magnets are pointed at each other and move closer together.

• The like poles of the magnets are pointed at each other and move closer together.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Madison has two bar magnets. First, she places them beside one another, as shown in Picture A. Then, she moves one of the bar magnets so they are placed as shown in Picture B. How did the magnetic force change?

• The bars go from attracting each other to repelling each other.

• The bars go from repelling each other to the second bar rotating.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of these determines whether or not a material is magnetic?

• the density of the material

• the alignment of atoms in the material

Tags

NGSS.MS-PS2-3

Shania claims that all magnets have two magnetic poles. Which of these observations would best support her claim?

• Iron is attracted to a magnet but not to other pieces of iron.

• When a bar magnet is cut in half, each half has a north pole and a south pole.

Colby tries to pick up a copper penny using a bar magnet, but the penny does not move. Next, he tries to pick up an iron nail using the bar magnet, and the nail lifts up toward the magnet. Which of the following best describes a ferromagnetic material like iron?

• Ferromagnetic materials conduct electricity easily.

• Ferromagnetic materials have magnetic domains that align with a magnetic field.

A magician wants to use magnets to create a new illusion for her show. She plans to hide strong magnets in her shoes and inside a special rug on the stage. When she tests the illusion, she finds that her shoes stick to the rug. What will happen if she flips the poles of the magnets in each of her shoes?

• Her shoes will float above the rug.

• Her shoes will still be stuck to the rug.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Why can some objects be magnetized by rubbing one pole of an existing magnet in one direction along the object?

• The motion of the existing magnet against the object aligns the magnetic domains of the object.

• The motion of the existing magnet against the object scrambles, or unaligns, the magnetic domains of the object.