Les 6 Friction

• Natuurkunde / Scheikunde
• Middelbare school
• vwo
• Leerjaar 1

Todays lesson

Friction

• Simple demonstration
• Friction
• Working independently
• The homework

Learning goals

• Explain friction in your own words.
• Give examples of how we use friction.

Demonstration

How does friction effect motion?

General facts about friction

• Friction is the force between two surfaces in contact with each other

• Friction is caused by the difference in texture between the surfaces and by adhesion (the surfaces slightly sticking to each other)

• We express friction in Newtons 

• Friction always acts in the direction opposite to the movement

90 N

30 N

Friction – Exercise

Answer the questions below in pairs (5 min)

• Look around you. What surfaces with a different friction do you see?
  

• What surfaces with different friction can you think of?
  

• In what direction does the force of friction act?

• What do we use friction for?

Learning goals

• Explain friction in your own words.
• Give examples of how we use friction.