Properties of materials – Clip

The video explains how surfers manage waves by standing on surfboards, which are made of porous plastic foam covered with a waterproof coating. This composition results in a light and strong surfboard with lower density than salt water, making it buoyant and allowing surfers to float and ride waves.

What is the primary reason surfers can stay on top of the water?

• They wear life jackets.

• They have special shoes.

• They use a surfboard.

• They swim very fast.

What material is commonly used to make the core of a surfboard?

• Wood

• Glass

• Porous plastic foam

• Metal

Why is a waterproof coating applied to surfboards?

• To make them heavier

• To prevent water absorption

• To change their color

• To make them more flexible

What characteristic of a surfboard allows it to float on water?

• Its length

• Its shape

• Its density

• Its color

How does a surfboard's buoyancy benefit a surfer?

• It allows the surfer to float and ride waves.

• It makes the surfboard more durable.

• It helps the surfer to dive deeper.

• It makes the surfboard faster.