Mystery Science: Invisible Forces

In the watermelon video, 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

The suspension bridge was a good design for the Golden Gate Bridge in San Francisco because...

• ships had to pass underneath the bridge.
• it has lots of pillars underneath it to support it.
• the distance the bridge had to cross was not very long.
• the water under the bridge was very shallow.

Tags

NGSS.MS-ETS1-1

Why are pillar and arch bridges stronger than a simple board bridge?

• They are bigger.
• Board bridges are usually made by kids and the other ones are made by grownups.
• Board bridges can sag in the middle, but the other bridges have more support.
• They are not made of wood.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-PS2-4

Push, pull or both?
Pressing a button

• Push
• Pull
• Both

Tags

NGSS.K-PS2-1

Push, pull or both?
Towing a person on a raft

• Push
• Pull
• Both

Tags

NGSS.MS-PS2-1

Push, pull or both?
Yanking your sister's hair

• Push
• Pull
• Both

Why is it hard to win a tug-0-war against an elephant?

• Elephants try really hard
• Elephants have more legs than we do
• Elephants have a lot of friction
• Elephants can push really hard

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

Tags

NGSS.MS-PS2-3

The force that keeps me on the ground is...

• Magnetism

• Friction

• Gravity

• Muscular force

Tags

NGSS.MS-PS2-4