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.

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-ETS1-2

) 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.

Magnets attract _____________

• objects that contain iron.

• only other magnets

• anything made of metal.

• things that are not too heavy

a push or a pull on an object

• friction

• gravity

• force

• tag of war

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

These are all types of bridges except

• pillar

• curved

• arch

• board

the resistance of motion when one object rubs against another.

• force

• friction

• gravity

• push or pull

a force that pulls down on objects

• force

• gravity

• friction

• push or pull

Tags

NGSS.MS-PS2-4

Which one of these things is magnetic?

• paper clips

• pennies

• paper

• pencils

Tags

NGSS.5-PS1-3