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Sreeshan

Jul 19

Frictional force

in Sreeshan

Pg:- 46,47. I just learned a bit more of the same topic.

Friction is what resists motion, it has many ways of resisting motion, from intermolecular attraction to surface asperities. (*Surface asperities are the harshness of the surface, which can often interlock and completely resist motion, but they can be avoided by lubricating the surfaces.*)

The attraction between the molecules of the two surfaces creates weak bonds that resist motion when the surfaces are moved against each other, causing friction.

Intermolecular friction can also happen between molecular bonding where 2 molecules may join due to friction but overcoming that friction is easy.

Types of friction:

Kinetic friction: A force that occurs when two or more objects are in contact and moving relative to each other.

solid friction: A type of friction that exists between two nonlubricated surfaces.

Static friction: The force of friction between two objects that are not moving.

Sliding friction: The resistance any two objects create when sliding against each other.

Rolling friction: The Force resisting motion when a rolling body is on a surface.

Fluid friction: The force that opposes a motion that takes place within fluids or in between fluids.

Intermolecular friction:

Van der Waals Forces: These weak, short-range forces arise from temporary dipoles created by the movement of electrons within molecules and are significant in many molecular interactions, including intermolecular friction.
Electrostatic Forces: These are forces between charged particles. In ionic compounds or materials with polar molecules, electrostatic interactions can contribute to intermolecular friction.
Steric Interactions: These arise from the physical obstruction of molecules due to their size and shape, which can resist their relative motion.
Hydrogen Bonds: These occur when hydrogen atoms in a molecule are attracted to electronegative atoms (like oxygen or nitrogen) in another molecule. Hydrogen bonding is particularly relevant in biological systems, such as DNA and protein structures.

2 comments

Comments (2)

indu marath

Jul 19

SREE include a good video just simply showing what is friction.

Factors affecting friction?
Formula to find frictional force?
What is lubricated friction?
Formula to find co efficient of friction.
Is friction a conservative or non conservative force?
What is fluid friction?
Is frictional force scalar or vector?
Which type of friction is greater , static or kinetic friction?
You spill a bucket of soapy water on a marble floor accidently.would it make it easier or more difficult to walk on floor.why?
Explain why sportsmen use shoes with spikes.
Explain why objects moving in fluids must have special shapes?

Sreeshan

Jul 20

Replying to

Factors affecting friction:

Surface Roughness: Rougher surfaces have higher friction because of increased interlocking of surface irregularities.
Normal Force: The greater the normal force pressing the two surfaces together, the greater the friction.
Material Properties: Different materials have different coefficients of friction; for example, rubber has higher friction on most surfaces compared to steel.
Surface Area: While the theoretical model often assumes friction is independent of surface area, in practical scenarios, the increased surface area can slightly alter friction due to variations in pressure distribution.
Presence of Lubricants: Lubricants reduce friction by creating a thin layer between surfaces, reducing direct contact.
Temperature: High temperatures can affect the material properties and reduce friction by causing surface melting or other alterations.

2. Formula:

Friction = coefficient of friction times the normal force

3. Lubricated friction:

Lubricated friction occurs when a lubricant (such as oil, grease, or water) is introduced between two sliding surfaces. The lubricant reduces the friction by forming a thin film that separates the surfaces, minimizing direct contact and thereby reducing frictional resistance.

4. formula to find the coefficient of friction:

Coefficient of friction = Friction divided by Normal force.

5. conservative or non-conservative:

Friction is a non-conservative force.

6. Fluid friction:

Fluid friction, also known as drag, is the resistance experienced by an object moving through a fluid (liquid or gas). It depends on factors such as the object's speed, the fluid's viscosity, and the object's shape and surface area.

7. Friction scalar or vector:

Vector.

8. Which is greater static or kinetic:

Static friction is generally greater than kinetic friction.

9. It will be difficult to walk on the floor was the friction will decrease and you will slip.

10. So that it creates greater friction while climbing mountains or running on a football field.

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