lesson 12

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.
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Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 32 slides, with text slides and 2 videos.

Items in this lesson

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 1 - Slide

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What is Streamlining?

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

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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?

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Increase air resistance:
Make the surface area larger

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Decrease air resistance:
Make the surface area Smaller

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

  • Speeding up increases air resistance. 

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Air resistance

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Lesson plan
  •  Reducing air resistance
  • Terminal velocity

  • Working independently

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Learning goals
  •  Describe what air resistance is + examples

  • Explain what streamlining is and how it works
  • Explain how terminal velocity works

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Recap
  • What is air resistance?
  • How does it affect motion?
  • Name 3 examples of Air resistance.

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Air resistance
The force of air resisting the motion of objects. 

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Air resistance
The force of air resisting the motion of objects. 

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Air resistance

  • Works in the opposite direction of the motion

  • Causes more force to be needed to reach the same speed.

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Air resistance

Examples?

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Streamlining

Terminal velocity

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

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Exercise
  • Think of two examples which air resistance is reduced. What do they have in common?

  • Think of two examples in which air resistance is increased. What do they have in common?

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Slide 22 - Video

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

  • Speeding up increases air resistance. 

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5

Slide 24 - Video

Start video at 1:17


Working independently

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Learning goals
  •  Describe what air resistance is + examples

  • Explain what streamlining is and how it works
  • Explain how terminal velocity works

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01:38
Question 2
  • What will happen to the air resistance as her speed increases?

  • What will this do to her falling speed?

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02:12
Question 4
  • How will pulling out her parachute effect the air resistance?

  • What will this do to her speed? Explain. 

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01:21
Question 1
  • What force makes her fall down?

  • What will happen to her speed? Explain.

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01:52
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?

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02:17
Question 5
  • What will slowing down do to the air resistance acting on her?

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