les 16

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

1 / 19
suivant
Slide 1: Diapositive
Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 1

Cette leçon contient 19 diapositives, avec diapositives de texte et 2 vidéos.

Éléments de cette leçon

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

Slide 1 - Diapositive

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.

Slide 2 - Diapositive

What is Streamlining?

Slide 3 - Diapositive

Stream lining
To form an object in a way that reduces air resistance.
  • Low to the ground.
  • Small surface area.

Slide 4 - Diapositive

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?

Slide 5 - Diapositive

Slide 6 - Diapositive

Increase air resistance:
Make the surface area larger

Slide 7 - Diapositive

Decrease air resistance:
Make the surface area Smaller

Slide 8 - Diapositive

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

  • Speeding up increases air resistance. 

Slide 9 - Diapositive

Slide 10 - Vidéo

5

Slide 11 - Vidéo

00:14
Question 1
  • What force makes her fall down?

  • What will happen to her speed? Explain.

Slide 12 - Diapositive

00:30
Question 2
  • What will happen to the air resistance as her speed increases?

  • What will this do to her falling speed?

Slide 13 - Diapositive

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?

Slide 14 - Diapositive

01:00
Question 5
  • How will pulling out her parachute effect the air resistance?

  • What will this do to her speed? Explain. 

Slide 15 - Diapositive

01:25
Question 6
  • What will slowing down do to the air resistance acting on her?

Slide 16 - Diapositive

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.

Slide 17 - Diapositive

Homework
Read: §1.8
Do: Workbook, §1.6, question 1, 2 and 3

Slide 18 - Diapositive

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.

Slide 19 - Diapositive