Les 7

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

Copy these 3 questions

• At what place(s) does friction play a role in each image?

• What role does friction plays at those points?

• Is there a lot of friction or little friction at those points?

How do we use friction?

How can friction 

be reduced?

The homework

Exercise 1

Newtons.

In contact.

Lubrication.

Opposite to.

Exercise 2

Large.

Large.

Small.

Large

Todays lesson

• Discuss friction
• The homework
• §1.4 Gravity

Todays lesson

• Discuss friction
• The homework
• §1.4 Gravity

Goals

• Name the cause of the gravitational force.
• Explain why we are pulled to the earth.
• Describe mass and weight.

§1.4 Gravity

Gravity

What are

Mass and weight?

Gravity

Mass (Kg)	Weight (N)
The amount of matter (stuff) in an object	The amount of force gravity exerts on an object.

Homework

Read: §1.4 (textbook)

Do: yellow block questions §1.4 (textbook)

Goals

• Name the cause of the gravitational force.
• Explain why we are pulled to the earth.
• Describe mass and weight.