les 16

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

This lesson

• The science test.
• Closing of air resistance.
• Calculating weight.

Goals

• Describe what streamlining means.

• Name ways to increase and decrease air resistance.

•  Explain the fall of a skydiver in terms of  air resistance and falling speed.

What is Streamlining?

Stream lining

To form an object in a way that reduces air resistance.

• Low to the ground.
• Small surface area.

Exercise

• Find the two images in which air resistance is reduced. What do they have in common?

• Find the two images in which air resistance is increased. What do they have in common?

Increase air resistance:

Make the surface area larger

Decrease air resistance:

Make the surface area Smaller

Important

• Air resistance makes you speed up at a slower rate.

• Speeding up increases air resistance. 

00:14

Question 1

• What force makes her fall down?

• What will happen to her speed? Explain.

00:30

Question 2

• What will happen to the air resistance as her speed increases?

• What will this do to her falling speed?

00:41

Question 3

• Air resistance and gravity are balanced. What does this mean for her falling speed?

•  How does the graph in the book call this phase?

01:00

Question 5

• How will pulling out her parachute effect the air resistance?

• What will this do to her speed? Explain. 

01:25

Question 6

• What will slowing down do to the air resistance acting on her?

Exercise

1)Donald trump accidentally ended up on Mars! Donal trump has a mass of 110 kg. The gravitational field strength on Mars is 3.7 N/kg. What is his weight on mars? Include your calculation.

2) Does Mars have a larger or a smaller mass than earth? Explain your answer.

Homework

Read: §1.8

Do: Workbook, §1.6, question 1, 2 and 3

Goals

• Describe what streamlining means.

• Name ways to increase and decrease air resistance.

•  Explain the fall of a skydiver in terms of  air resistance and falling speed.