Topic 10: Friction and drag (HL only) - Jamie Robertson | Library

1

Friction force = __________ X __________

1

Coefficient of friction =

1

Click on the picture where we see the detail of the INTERACTION between the tyre and the. road surface.

2

How could we increase this interaction?

2

Ideally, what are we looking for here?

Interaction between skis and the snow
Interaction between football boots and the playing surface
Interaction between Ice skates and the ice
Interaction between rock climbing shoes and the rock face

High
Low

Question 8 | 00:08

Question 9 | 00:22

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Question 8

00:08

Question 9

00:22

3

Drag is the ____________________  acting to ______________________ of an___________  through a _________________  such as _________________ .

Categorise what form of drag is being minimised:

A swimmer staying under the water
A swimmer kicking legs to keep them high
A skier wearing a skin suit
A cyclist adopting a low profile position
A cyclist shaving their legs
A swimmer outstretching their hands to form a long streamlined body position
A swimmer wearing a swim cap
A bike frame made with oval tubing
A speed skier wearing a teardrop shaped helmet

Surface drag
Form drag
Wave drag

4

This is Dave, don't you think he looks cool? 
Dave really hates drag, he will do anything to reduce it and he's looking for advice from you. Luckily, you know all about drag! Use the elements of the equation in the slide above to give him some of your top tips. Remember, he doesn't need to win races, just reduce that drag - he will do anything or go anywhere:

Cd: _______ 
A: _______ 
ρ: _______ 
V: _______ 

2

Dave would hate this question, you have to drag and drop!

Other Answer Choices:

Friction force

Normal reaction force

Weight

Pushing force

Air resistance

4

Compare the drag considerations of a professional cyclist wearing a skin suit in a high altitude aerodrome and a Tommy B in a hoodie jogging along the Promenade des Anglais in Nice. Remember, to compare you must mention both. There are 7 options here, choose the 4 you think would be best to use as a comparison.

Fluid density:_______ 
Velocity: _______ 
Surface drag: _______ 
Form drag: _______ 
Wave drag: _______ 
Frontal area: _______ 
Coefficient of drag: _______ 