lesson 7

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

This lesson

• Recap friction
• Discussing the homework 
• Closing of 1.3
•  Working independently

Learning goals

• Give examples of friction
•  Explain the cause of friction
• Describe the effect of friction on motion
• Explain how to reduce friction
• Describe how friction can be useful

Recap

Friction — what did we cover?

Recap

Exercise — What are examples of friction around you right now?

Recap

What causes friction?

The irregularities in the texture of surfaces cause friction

Discussing

The homework

Reducing friction

Using 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?

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?

Done?

• Do the workbook exercises of 1.3
  
• Or read textbook 1.4
  

A lot of friction

Very little friction

A lot of friction

Very little friction

A lot of friction

Very little friction

What is the resultant force?

90 N

30 N

Next lesson

Homework

Workbook exercises of 1.3

Read textbook 1.4

Learning goals

• Give examples of friction
•  Explain the cause of friction
• Describe the effect of friction on motion
• Explain how to reduce friction
• Describe how friction can be useful