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False.
Since friction means a contact force, the nature of contact will influence friction force. Smoothness of objects affect the friction force. However, as contact pressure rises, the friction does not rise.
The force of friction does, but the coefficient of friction does not.
How is rolling friction caused
True. Friction is the force that resists motion when the surface of one object comes in contact with the surface of another
False.
Since friction means a contact force, the nature of contact will influence friction force. Smoothness of objects affect the friction force. However, as contact pressure rises, the friction does not rise.
Some examples of contact forces are tension, friction, and air resistance. An example of a sentence using the term "contact force" is "The fundamental force that gives rise to contact forces is the electromagnetic force. "
Contact.
How is rolling friction caused
The force of friction does, but the coefficient of friction does not.
Fluid friction will vary with speed and the area of contact when referring to air friction or drag. When referring to surface friction then only the area of contact will vary.
True. Friction is the force that resists motion when the surface of one object comes in contact with the surface of another
Generally, the higher the contact force, the higher the friction.
non contact
Friction prevents surfaces in contact from sliding past each other. There are several types of friction including dry friction, fluid friction, lubricated friction, skin friction and internal friction.
As the coefficient of friction is not function of the area or not related to the area of the contact surface so the coefficient of friction remains constant on the increase of the contact area. The coefficient of friction depends upon the material of the friction surfaces only.