Invisible Forces Practice

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

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

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

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

Magnets attract _________

• objects that contain iron

• only other magnets

• anything made of metal

• things that are not too heavy

Why do hoppers hop off the table?

• They are magnetic.

• They are made of cardboard.

• The rubber band is stretched and is pulling on the sides of the cardboard. It pushes off the table when you let go.

• The hopper is small enough that is can jump by itself and will fly into the air.

Tags

NGSS.MS-PS2-2

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

• Pillar and arch bridges are higher up than board bridges.

• Board bridges don't have anything underneath to support them.

• Board bridges are flat and thick so they are stronger.

• Pillar and arch bridges are prettier and are stronger for this reason.

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-1

Are paper clips magnets?

Tags

NGSS.MS-PS2-3