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How does velocity of an object affect the frictional force between it and the surface with which it comes in contact?
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Does the frictional force depend on the area of surface contact?
No. Frictional force is independant of surface area.
What are the 2 factors that affect the frictional force between 2 surface?
velocity and texture
Why does weight affect frictional force?
Given an object if contact with a surface, the limiting frictional force is directly proportional to the normal reaction to the weight of the object at its point of contact with the surface.
Does then frictional force depend on the type of surfaces in contact?
Yes. Different materials and different surface structures affect the frictional force.
How can you show that frictional force depends on nature of surface in contact?
Sandpaper vs. a bar of soap
Does the frictional force depend on the area of surface contact?
No. Frictional force is independant of surface area.
What are the 2 factors that affect the frictional force between 2 surface?
velocity and texture
Why does weight affect frictional force?
Given an object if contact with a surface, the limiting frictional force is directly proportional to the normal reaction to the weight of the object at its point of contact with the surface.
Does then frictional force depend on the type of surfaces in contact?
Yes. Different materials and different surface structures affect the frictional force.
What is the force that oppose motion between surface?
Frictional force
How can you show that frictional force depends on nature of surface in contact?
Sandpaper vs. a bar of soap
What is the name of the frictional force between the surface and the air?
Viscous drag
Does the frictional force depend on the type of surface in contact?
Yes. Different substances have a different coefficient of friction.
Does the nature of surface in contact influence friction force?
Yes. Roughly speaking, smooth surfaces tend to have less frictional force.
What are some material that increase friction between two objects?
A substance which has hard surface will have more frictional properties
What are the two factors that affect the friction force between two?
normal force acting between them and surface roughness or frictional value that is mieu.
What is mean velocity gradient?
The difference in velocity between adjacent layers of the fluid is known as a velocity gradient and is given by v/x, where v is the velocity difference and x is the distance between the layers. To keep one layer of fluid moving at a greater velocity than the adjacent layer, a force F is necessary, resulting in a shearing stress F/A, where A is the area of the surface in contact with the layer being moved.
