Invisible Forces Review

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.

Why do hoppers hop off the table?

• The hoppers hop off the table because the rubber bands pulled on the sides of the cardboard.

• The hoppers hop off the table because there is a frog drawn on it. I know that frogs hop.

Tags

NGSS.3-PS2-1

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

Are paper clips magnets?

• No, paper clips ARE NOT magnets but they do stick to magnets.

• Yes, paper clips are magnets.

Tags

NGSS.MS-PS2-5

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

Sandpaper sliders don’t slide very fast because ___________.

• sand makes the slider too heavy.

• sandpaper creates a lot of friction.

• it didn’t have enough pennies on it.

• the slide isn’t long enough.

Pillar bridges and arch bridges are stronger than board bridges because board bridges don't have anything underneath them to support them.

• True

• False

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-4

Magnets attract _____________.

• objects that contain iron.

• only other magnets.

• anything made of metal.

• things that are not too heavy.

If you wanted to go down a slide faster, what are some things you could do? Choose all that are correct.

• You could make the slide more slippery.

• You could ride on a piece of sandpaper.

• You could wear slippery clothes.

• You could ride on slippery material.

Tags

NGSS.MS-PS3-5