# What is the reaction force of Friction?

We also know that in Newtonian physics, action and reaction forces exist in pairs and that a reaction force is always applied to the other object.

Take friction between the tire and the road, for instance. When the tire applies force to the road in a backward direction, the road applies force to the tire in a forward direction at the same time. These two forces—the road's force on the tire and the tire's force on the road—are both frictional forces and represent distinct facets of the same interaction.

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The reaction force of friction is equal in magnitude and opposite in direction to the applied force.

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- An object with a mass of #6 kg# is hanging from a spring with a constant of #12 (kg)/s^2#. If the spring is stretched by # 29 m#, what is the net force on the object?
- An object with a mass of #4 kg# is on a ramp at an incline of #pi/8 #. If the object is being pushed up the ramp with a force of # 2 N#, what is the minimum coefficient of static friction needed for the object to remain put?
- How fast will an object with a mass of #3 kg# accelerate if a force of #19 N# is constantly applied to it?
- An object with a mass of #8 kg# is lying still on a surface and is compressing a horizontal spring by #5/6 m#. If the spring's constant is #3 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
- If a #1 kg# object moving at #1 m/s# slows down to a halt after moving #1 m#, what is the friction coefficient of the surface that the object was moving over?

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