Physics, 06.12.2019 21:31 daniellecraig77

Technician a says that the back of all engine bearings should be lubricated during assembly. technician b says that the face of the main and rod bearings should be lubricated before final assembly. which technician is correct?

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Answer from: zah16

Technician B is correct.

Explanation:

Friction is an oppositional force that tends to oppose the relative motion of two surfaces in contact. The two types are; static and dynamic friction. Because it generates heat and reduces the efficiency of a machine, it has to be reduced in machines.

Friction can be reduced either by; lubrication, polishing or smoothing, streamlining and the use of bearings. A bearing is a device that can be used to reduce friction between two moving parts. There is a need for the lubrication of the bearing during assembling to ensure its smooth running. Lubrication is a process of reducing friction between moving parts by the use of oil or grease.

The face of the main and rod bearings should be lubricated before final assembly because after the assembly, the rod is found to rotate within the main bearing. Thus, friction between these moving parts has to be reduced.

Engine bearings are used to reduce friction between the rotating part of the engine and the stationary part. Lubrication is important to avoid unnecessary noise, the disruption of the bearings and complete damage of the engine. Its internal part has to be lubricated and not the back, to increase the gripping at the back due to friction.

In both cases, lubrication is very important.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf, ℰ, to a battery's terminal voltage, v, current, i, and internal resistance, r, is ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

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Technician a says that the back of all engine bearings should be lubricated during assembly. technic...