Question

What is friction?

Answer 1

The best answer is C.

The force that opposes the motion of an object is called friction.

There are two kind of friction namely kinetic and static friction forces.

Kinetic friction is the force that is exerted on one surface by another when the two surfaces rub against each other because one or both surfaces are moving.

Static friction is the opposing force that acts against a secondary force that is trying to cause a stationery object to start moving.   If there is no such force acting on the subject, the static friction is nil or zero.

Answer 2

Hello!

Answer: C.

Explanation:

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Friction is an opposing force between two objects. Friction is a contact force that objects exert on each other when they rub together. Friction opposes motion. Microscopic bumps and ridges cause friction. Rougher surfaces create greater friction. Friction resists motion.. Friction is a contact force. Friction is caused by microscopic bumps and ridges on surfaces. Like any force, friction causes a change in motion. Causes objects to slow down. Causes objects to change direction. Friction is often needed for movement to occur. Allows tires, shoes, feet, etc., to have traction. Friction is always parallel to the surfaces that rub together. Friction is always in the opposite direction of the motion. The force of friction has the opposite sign from the force of the push or pull. Static friction acts on objects that are not moving. Prevents slipping and keeps objects in place. Requires extra force to be overcome. Kinetic friction acts on moving objects. Acts against motions, slows objects. Types of kinetic friction include: sliding friction (difficult to overcome) and rolling friction (easy to overcome). Fluid friction acts on solid objects as they move through a fluid. Easy to overcome. Fluid friction is affected by different factors than friction between solid surfaces. Shape of an object, surface area of an object, and speed of an object. Air resistance is a type of fluid friction that acts on objects moving through air. Reducing friction can increase an object's speed, make objects easier to move, and reduce wear and tear on objects. Lubricants, ball bearings, aerodynamic designs, and nonstick materials. Increasing friction can provide traction on slippery surfaces, slow objects down, and generate heat. Increase roughness, increase surface area, and increase speed.

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