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Friction
MUHAMMAD MAAYER
5-F
Forces: Friction
Friction is a force that
opposes motion between two
surfaces.
Forces: Friction
Friction occurs because the surface of any object is rough.
Even surfaces that feel smooth are covered with microscopic
hills and valleys.
Forces: Friction
When two surfaces are in contact, the hills and
valleys of one surface stick to the hills and
valleys of the other surface.
Friction Factors
The amount of friction depends on these 2 factors:
1. Roughness of the surfaces/texture
2. The force pushing the surfaces together.
Will the tube roll less over a smoother surface or a
rougher surface? Why?
Smooth Surface
Rough Surface
The rougher surface because there are more
hills and valleys and the valleys are deeper.
Which has more friction and why?
100 pounds
The 100 pound box because the
force pushing together is higher
so the hills and valleys are in
closer contact.
40 pounds
Friction Factors
1. Roughness – The rougher the surface, the
more hills and valleys there are and the
greater the friction.
2. Force pushing together/weight – Force is
increased, the hills and valleys will be in closer
contact and friction will increase.
Amount of Surface Area in fluids
• The amount of surface area affects the friction
between objects in liquids and gases. Example:
Swimming
Types of Friction
1. Sliding
2. Fluid
3. Rolling
4. Static
Sliding Friction
• Sliding friction is a friction force
that opposes the direction of motion
of an object that occurs when solid
surfaces slide over one another.
• Examples:
• Writing – pencil point and paper
• Combing your hair – surface of
comb and strands of hair
Fluid Friction
• The force that tries to slow objects down when they move
through a liquid or a gas. It's also known as "drag", or "air
resistance".
• All gases and liquids are fluids.
• Fluid Friction increases as the speed of the object
increases.
• An airplane and a swimmer both experience fluid friction.
Rolling Friction
• Rolling friction is friction that
occurs between surfaces in motion
that are rolling in which one of
the surfaces is a wheel, roller, or
ball.
• Examples:
• Riding a bike – tires and ground
• Bowling – ball and lane
Static Friction
• Static friction is friction that
occurs when the surfaces in
contact are at rest (not in
motion).
• Examples:
• A book resting on a desk.
• A potted plant sitting on a
sidewalk.
Ways to Reduce Friction
• Smooth the surface – less hills and valleys and not as
deep.
• Replace sliding with rolling (Use Wheels)
• Add a lubricant like oil, wax, or grease – Fills in the hills
and valleys.
• Less force pushing together – The hills and valleys are
not pushed together as hard so they have less contact.
Ways to Increase Friction
• Rough the surface – more hills and valleys
• Replace rolling with sliding
• More force pushing together – The hills and valleys are
pushed together harder so the hills and valleys are in
closer contact.
Friction Song
•What is friction?
•Friction Video
Glass
Forces: Friction
Surfaces that may cause more friction.
Sandpaper
Carpet
Gravel
ICE
Tile
Surfaces that may cause less friction
Forces: Friction
Friction is both harmful and helpful.
Forces: Friction
FRICTION.pptx

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FRICTION.pptx

  • 2. Forces: Friction Friction is a force that opposes motion between two surfaces.
  • 3. Forces: Friction Friction occurs because the surface of any object is rough. Even surfaces that feel smooth are covered with microscopic hills and valleys.
  • 4. Forces: Friction When two surfaces are in contact, the hills and valleys of one surface stick to the hills and valleys of the other surface.
  • 5. Friction Factors The amount of friction depends on these 2 factors: 1. Roughness of the surfaces/texture 2. The force pushing the surfaces together.
  • 6. Will the tube roll less over a smoother surface or a rougher surface? Why? Smooth Surface Rough Surface The rougher surface because there are more hills and valleys and the valleys are deeper.
  • 7. Which has more friction and why? 100 pounds The 100 pound box because the force pushing together is higher so the hills and valleys are in closer contact. 40 pounds
  • 8. Friction Factors 1. Roughness – The rougher the surface, the more hills and valleys there are and the greater the friction. 2. Force pushing together/weight – Force is increased, the hills and valleys will be in closer contact and friction will increase.
  • 9. Amount of Surface Area in fluids • The amount of surface area affects the friction between objects in liquids and gases. Example: Swimming
  • 10. Types of Friction 1. Sliding 2. Fluid 3. Rolling 4. Static
  • 11. Sliding Friction • Sliding friction is a friction force that opposes the direction of motion of an object that occurs when solid surfaces slide over one another. • Examples: • Writing – pencil point and paper • Combing your hair – surface of comb and strands of hair
  • 12. Fluid Friction • The force that tries to slow objects down when they move through a liquid or a gas. It's also known as "drag", or "air resistance". • All gases and liquids are fluids. • Fluid Friction increases as the speed of the object increases. • An airplane and a swimmer both experience fluid friction.
  • 13. Rolling Friction • Rolling friction is friction that occurs between surfaces in motion that are rolling in which one of the surfaces is a wheel, roller, or ball. • Examples: • Riding a bike – tires and ground • Bowling – ball and lane
  • 14. Static Friction • Static friction is friction that occurs when the surfaces in contact are at rest (not in motion). • Examples: • A book resting on a desk. • A potted plant sitting on a sidewalk.
  • 15. Ways to Reduce Friction • Smooth the surface – less hills and valleys and not as deep. • Replace sliding with rolling (Use Wheels) • Add a lubricant like oil, wax, or grease – Fills in the hills and valleys. • Less force pushing together – The hills and valleys are not pushed together as hard so they have less contact.
  • 16. Ways to Increase Friction • Rough the surface – more hills and valleys • Replace rolling with sliding • More force pushing together – The hills and valleys are pushed together harder so the hills and valleys are in closer contact.
  • 17. Friction Song •What is friction? •Friction Video
  • 18. Glass Forces: Friction Surfaces that may cause more friction. Sandpaper Carpet Gravel ICE Tile Surfaces that may cause less friction
  • 19. Forces: Friction Friction is both harmful and helpful.