Question

24. The force of friction (f) and
the normal reaction (R)
between two surfaces in
contact are related as.
*​

Answer 1

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.[2] There are several types of friction:

Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.[3][4]

Simulated blocks with fractal rough surfaces, exhibiting static frictional interactions[1]

Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces.[5][6][7]

Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.

Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation.[4]

When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Kinetic energy is converted to thermal energy whenever motion with friction occurs, for example when a viscous fluid is stirred. Another important consequence of many types of friction can be wear, which may lead to performance degradation or damage to components. Friction is a component of the science of tribology.

Friction is desirable and important in supplying traction to facilitate motion on land. Most land vehicles rely on friction for acceleration, deceleration and changing direction. Sudden reductions in traction can cause loss of control and accidents.

Friction is not itself a fundamental force. Dry friction arises from a combination of inter-surface adhesion, surface roughness, surface deformation, and surface contamination. The complexity of these interactions makes the calculation of friction from first principles impractical and necessitates the use of empirical methods for analysis and the development of theory.

Friction is a non-conservative force - work done against friction is path dependent. In the presence of friction, some kinetic energy is always transformed to thermal energy, so mechanical energy is not conserved.

Explanation:

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Answer 2

Answer:

The force of friction (f) and the normal reaction (R) between two surfaces in contact are directly proportional.

Explanation:

There is a force acting between two bodies when they are in contact with one another. This force is known as the contact force since it is caused by the contact between the two bodies. It is possible to divide this contact force into two halves. The frictional force is referred to as the horizontal component of the contact force, while the normal reaction force is the vertical component. A reaction force that acts perpendicular to the surfaces in contact is the typical reaction force. The force that prevents motion between two surfaces is known as friction.

The frictional force can be calculated using the formula f=μN,

where μ is the coefficient of friction, which varies depending on the two interacting objects.

Since is a constant in this calculation, we can substitute f∝N in its place to represent the proportionality.

It follows that the frictional force and the typical reaction force are directly related.

To learn more about the force of friction (f), click on the link below:

https://brainly.in/question/20726841

To learn more about the normal reaction (R), click on the link below:

https://brainly.in/question/25717890

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