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Friction. “Friction is a Force that always pushes against an object when it touches another object” “When 2 things are in contact with each other, there will be friction acting between them”. Friction…. High friction (lots of friction) – will slow something down

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friction

Friction

“Friction is a Force that always pushes against an object when it touches another object”

“When 2 things are in contact with each other, there will be friction acting between them”

friction2
Friction…
  • High friction (lots of friction) – will slow something down
  • Low friction (not much friction) – will keep things moving
high friction or low friction
High friction or Low friction?

Ski’s on the snow

Car tyre

Brakes on a bike Water on a slide

Pencil and rubber

how can we reduce the friction between 2 objects
Reduce the contact area by using rollers/ball-bearings/wheels

Change the surfaces of the materials that are touching by using lubrication eg. Oil

Create a cushion of air

Eg. Like a hovercraft or air hockey table

How can we reduce the friction between 2 objects?
fluid friction
“Fluid” Friction
  • This type of friction is what happens with liquids and gases (In Physics, liquids and gases are both called "fluids". They behave in similar ways.)
  • Fluid friction is also known as "drag". On aircraft it's also called "air resistance". It depends on:-
    • how thick the fluid is      (its "viscosity")
    • the shape of the object
    • the speed of the object
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Aircraft and car designers want to reduce drag, so that the vehicle can go fast without having to waste too much fuel.
  • How do you think they can do it?
paper aeroplane competition
Paper Aeroplane Competition

Aim:

  • The winning team is the one who gets their plane to stay in the air the longest and is the fastest.
  • Materials:
  • 1 sheet of blank paper
  • 1 paperclip
  • Scotch tape

Instructions:

  • Use only the materials indicated in the above list; you don’t have to use them all.
  • The plane may be constructed using all or part of the 21.5 x 28 cm sheet of paper.
  • Label each plane with the "engineer’s" name.
  • Each group is allowed three throws; record the best throw only.
  • Begin timing with the throw of the plane and end when the plane hits the floor.
  • Settle a tie with a throw-off.
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