lesson 12

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

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. 

Air resistance

Lesson plan

•  Reducing air resistance
• Terminal velocity


• Working independently

Learning goals

•  Describe what air resistance is + examples
  

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

Recap

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

Air resistance

The force of air resisting the motion of objects. 

Air resistance

The force of air resisting the motion of objects. 

Air resistance

• Works in the opposite direction of the motion
  

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

Air resistance

Examples?

Streamlining

Terminal velocity

Streamlining

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

• Low to the ground.
• Small surface area.

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?

Important

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

• Speeding up increases air resistance. 

Start video at 1:17

Working independently

Learning goals

•  Describe what air resistance is + examples

• Explain what streamlining is and how it works

• Explain how terminal velocity works

01:38

Question 2

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

• What will this do to her falling speed?

02:12

Question 4

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

• What will this do to her speed? Explain. 

01:21

Question 1

• What force makes her fall down?

• What will happen to her speed? Explain.

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?

02:17

Question 5

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