The discussion clarifies that friction does not depend on the velocity of an object but rather on the material of the surfaces in contact and the normal force acting on the object. It highlights that stirring a spoon in lemonade generates heat due to viscous forces, which are analogous to friction in fluids. The temperature of the lemonade increases with continuous stirring, as demonstrated by Boltzmann's water churning experiment, which established the relationship between joules and calories. The conversation emphasizes that while frictional force remains constant, the work done by this force—and consequently the heat generated—can be influenced by the speed of stirring.
PREREQUISITESThis discussion is beneficial for physics students, educators, and anyone interested in understanding the principles of friction, heat generation in fluids, and the dynamics of stirring in liquid systems.
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.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 and yes.avito009 said:Is it the force of friction between the spoon and water?And does this friction cause an increase in temperature?