Invisible Forces

Why is it hard to win a tug-of-war against a group of teachers?

• Teachers try really hard.

• Teachers have more legs than students.

• Teachers have a lot of friction.

• Teachers can push really hard with their feet.

The last rubber band caused the watermelon to burst because _________.

• it was stronger than the other rubber bands.

• it was thicker than the other rubber bands.

• it was the last rubber band in the bag.

• it created a force that was greater than the force of the watermelon rind.

Tags

NGSS.MS-PS2-2

Why was a suspension bridge a good design for the Golden Gate Bridge in San Francisco?

• Ships had to pass underneath the bridge.

• It has a lot of pillars underneath to support it.

• The distance the bridge had to cross wasn’t very long.

• The water under the bridge was very shallow.

Tags

NGSS.MS-ETS1-1

Magnets attract _____________.

• objects that contain iron.

• only other magnets.

• anything made of metal.

• things that are not too heavy.

Two main types of forces are _____________.

• Push and pull

• Connect and contract

• Fall and lift

• The Dark side and the Light side

Tags

NGSS.MS-PS2-1

Explain how the hoppers hop off the desk. What forces were there?

• The stretched rubber band pulls the sides together, which pushes the hopper off the desk and into the air.

• The rubber band pushes on the ruler and pulls the hopper up.

• The hopper is pulling on the rubber band and then gets pushed into the air by the ruler.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Why are pillar bridges and arch bridges stronger than board bridges?

• Pillar and arch bridges have support underneath.

• They are made with a metal and board bridges are just wood.

• Pillar and arch bridges only have to cross small areas.

Tags

NGSS.MS-PS2-1

Are paper clips magnets? Explain.

• No, not ever!

• Yes, of course!

• No, but they can become magnetized!

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What are a few interesting properties of magnets? (What can magnets do?) SELECT ALL correct answers.

• Can push an object without touching it.

• Can break objects in half.

• Can pull on an object without touching it.

• Can make objects with iron in them become magnetized.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5