les 6

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

Todays lesson

• The homework
• What is friction
• Working independently

Goals

• Explain friction in your own words. (unit, cause, direction)
• Give examples of how we use friction.
• Explain how to reduce friction.

Workbook question E

	Thrust of the car (N)	Friction (N)	Air resistance (N)	Resultant force (N)
A	1500	700	800
B	3000	500	100
C	1000	600	500
D	2500	900	400

What is friction?

• A type of force
• Expressed in newtons
• Acts between two surfaces
• Acts In the opposite direction of a motion

90 N

30 N

A lot of friction

Very little friction

A lot of friction

Very little friction

A lot of friction

Very little friction

Exercise

Answer the following questions:

1) Give examples of things that require a lot of friction.

2) Give examples of things that require very little friction.

3) How can friction be reduced?

4) How do we make use of friction?

Homework

Workbook §1.3  Exercise: 

1, 2 and 3

Goals

• Explain friction in your own words. (unit, cause, direction)
• Give examples of how we use friction.
• Explain how to reduce friction.