M3 Physics

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What is FRICTION?

• energy

• force

• living thing

• non-living thing

What is SURFACE?

• พื้นผิว

• กีฬาโต้คลื่น

• ท่อง

Friction is a force between ___________ surfaces that are sliding or trying to slide, across each other.

• 0

• 1

• 2

Friction always works in the direction _______________ to the direction in which the object is moving, or trying to move.

• the same

• opposite

Friction can ____________ moving object.

• slow down

• speed up

The amount of friction depends on the materials from which the two surfaces are made. In which surface will there be less fiction for skiing?

• Snow

• Rocks

There is __________ friction in smooth surfaces.

• less

• more

There is _________ friction on rough surfaces.

• less

• more

Friction can produce ___________. For example when you rub your hands together, there is friction between the surface of your palms. A while, your hands start to feel warm.

• power

• magic

• heat