Log inSign up for FREE
Library

Topic 10: Friction and drag (HL only)

Last updated almost 2 years ago
14 questions
1
Friction force = __________ X __________
1

Coefficient of friction =

1
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
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
1

What just happened?

1

Which is greater?

3
Drag is the ____________________ acting to ______________________ of an___________ through a _________________ such as _________________ .
Other Answer Choices:
force or forces
air or water
fluid medium
oppose the motion
object
3

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: _______