Is friction related to velocity?

In summary, the friction between objects is not affected by their relative speed, but the amount of work done and heat generated is affected. In the case of stirring a glass of lemonade, the friction between the spoon and water does cause an increase in temperature. This type of friction is known as viscous forces, which act on fluid-fluid and fluid-solid interactions. The nature of the fluid's viscous behavior determines how it is classified. Additionally, there may also be fluid forces involved when using a churning device to stir the lemonade, known as flow energy.
  • #1
avito009
184
4
I was mixing sugar in a glass of lemonade. As i stirred the spoon I thought that if I move the spoon faster it would cause the lemonade to heat up and thus increasing the temperature. Will the spoon cause heat to be generated in the lemonade? Also answer the title question.
 
Physics news on Phys.org
  • #2
Friction does not depend upon velocity of the object but the material of the surface(over which object is moving) and the object, also friction depends upon the normal force N acting on the object by the surface.
Also on a microscopic level friction is caused by electrostatic forces between the object and the surface.

avito009 said:
I was mixing sugar in a glass of lemonade. As i stirred the spoon I thought that if I move the spoon faster it would cause the lemonade to heat up and thus increasing the temperature. Will the spoon cause heat to be generated in the lemonade? Also answer the title question.
Yes the temperature of te lemonade will rise up on continuous stirring, infact this was done by Boltzmann in his water churning experiment to obtain the relation between joules and calories. Where 1 Calorie = 4.186 Joules. This ultimately killed the myth of "calorific fluid" which was then used to explain transfer of heat.
 
  • #3
The frictional force between two objects in not affected by their relative speed.
The amount of work done by that force (and hence the heat generated) is affected by their relative speed.
 
  • #4
Is it the force of friction between the spoon and water?And does this friction cause an increase in temperature?
 
  • #5
avito009 said:
Is it the force of friction between the spoon and water?And does this friction cause an increase in temperature?
Yes and yes.
 
  • #6
The resistance encountered by the spoon moving through water is not the same as the friction between solid surfaces. It does depend on the speed.
.
 
  • #7
Those are viscous forces that cause the heat inside this type of system, viscosity is ànalogous to friction in such system with a working fluid. Viscosity acts on fluid-fluid interaction and also fluid- solid interaction, according to the nature of viscous behaviour of the fluid, fluids are classified.
Also there can be fluid forces (flow energy) involved with the motion caused by agitation through the churning device.
 

FAQ: Is friction related to velocity?

How does friction affect velocity?

Friction is directly related to velocity in that it acts as a force that opposes the motion of an object. This means that the greater the friction, the harder it is for an object to maintain its velocity, resulting in a decrease in speed.

Is there a relationship between the amount of friction and the velocity of an object?

Yes, there is a direct relationship between friction and velocity. As the velocity of an object increases, the amount of friction also increases. This is because the faster an object moves, the more contact it has with its surroundings, resulting in more friction.

Can friction cause a change in an object's velocity?

Yes, friction can cause a change in an object's velocity. When an object is in motion, friction acts against its direction of motion, slowing it down. This results in a decrease in velocity.

How does the surface affect the relationship between friction and velocity?

The surface of an object can greatly impact the amount of friction and therefore, the velocity. Rough surfaces create more friction compared to smooth surfaces, resulting in a decrease in velocity. This is why it is easier to slide on ice (smooth surface) compared to sand (rough surface).

Does velocity have an effect on the type of friction experienced by an object?

Yes, the type of friction experienced by an object can change depending on its velocity. At low velocities, static friction is dominant, while at higher velocities, kinetic friction takes over. This is because the force required to overcome static friction is greater than that of kinetic friction.

Similar threads

Back
Top