Understanding Surface Tension

Why does a needle float on water despite being denser than water?

• Due to the water's temperature

• Due to water's surface tension

• Because the needle is hollow

• Because of the needle's shape

What allows water striders to walk on water while humans cannot?

• Their long legs

• The small scale of surface tension forces

• Their ability to swim

• Their lightweight bodies

How does surface tension contribute to the stability of sandcastles?

• By forming bridges between sand grains

• By increasing the weight of the sand

• By making the sand grains larger

• By drying the sand quickly

What is the primary reason surface tension is negligible for humans?

• Humans are too heavy

• Humans are not in contact with water

• Humans have a larger surface area

• Surface tension forces are small scale

In the jar and mesh experiment, what prevents the water from escaping when the jar is inverted?

• The mesh's tight weave

• The air pressure inside the jar

• The surface tension of the water

• The weight of the water