Question

vocabulary: attract, bar magnet, ferromagnetic, magnetize, north pole, repel, south pole
prior knowledge questions (do these before using the gizmo.)

1. what happens when you place two magnets close together?
2. what objects do magnets stick to? make a list.
3. what do these objects have in common?

gizmo warm - up: what is attracted to magnets?
a bar magnet is a simple rectangular magnet. if you hang a bar magnet by a string, the north pole (n) of the magnet will tend to point north while the south pole (s) of the magnet points south.

1. look at the materials at the bottom of the gizmo. which ones do you think will stick to a bar magnet?
2. ferromagnetic materials are strongly attracted to magnets. drag a bar magnet and the piece of nickel onto the scribbled line. press play (▶).

a. is nickel ferromagnetic?
b. how do you know?

1. test copper, wood, glass, and iron. which ones are ferromagnetic?

Explanation:

Prior Knowledge Questions

1. Corrected: Like poles repel, opposite poles attract.
2. Expanded common magnetic objects.
3. Identified the shared material property.

Gizmo Warm-up

1. Listed materials that stick to bar magnets based on magnetic properties.
2. Answered based on the definition of ferromagnetic materials (strongly attracted to magnets).
3. Identified which test materials are ferromagnetic based on magnetic attraction behavior.

Answer:

Prior Knowledge Questions

1. If like poles (north-north or south-south) are placed close, they repel; if opposite poles (north-south) are close, they attract.
2. Iron, nickel, cobalt, steel (iron alloy), some stainless steels
3. They are all made of ferromagnetic metals (or alloys containing ferromagnetic metals).

Gizmo Warm-up

1. Iron, nickel, cobalt (and their magnetic alloys)
2. A. Yes

B. Nickel is strongly attracted to the bar magnet, which matches the definition of a ferromagnetic material.

1. Iron