Question

1. is a contact force that resist motion,
2. is a kind of friction that tries to slow object down when they move through liquid or gas.
3. is a friction that occurs when the surfaces in contact are at rest.
4. is a friction that exist on rolling object.
5. is a friction that exist when solid surfaces slide over one another.​

Answer 1

Explanation:

1. The air resistance is a special type of frictional force that acts upon objects as they travel through the air. The force of air resistance is often observed to oppose the motion of an object.
2. Rolling friction is the resistive force that slows down the motion of a rolling ball or wheel. It is also called rolling resistance. ... Rolling friction hinders the motion of an object rolling on a surface, that means it slows down the motion of an object rolling on a surface.
3. Static friction, in contrast, acts between surfaces at rest with respect to each other. The value of static friction varies between zero and the smallest force needed to start motion.
4. Objects that are “rolling without slipping” will experience rolling friction and not kinetic friction. This case assumes that there is sufficient static friction to keep the object rolling rather than sliding, but the static friction is not interfering with the motion, rather it is the process that allows the rotation.
5. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.

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