friction between sliding surfaces is caused by _____. inertia, microwelds, the normal force, or gravity
2 answers:
Answer:
<h2>The normal force.</h2>Explanation:
Friction can be defined as the resistance of movement applied on a object, that's why is always in opposite direction of the movement.
However, the full definition is accomplish by analysing its equation:
Where is the coefficient of friction, which change from 0 to 1, depending on the material of the surface.
refers to the normal force, which is the reaction of the weight, according with Newton's third law, its equal and opposite to the weight.
As you can see, friction depends directly on the normal force, the greater is this force, the greater will be the "friction force".
Therefore, the right answer is the third option.
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According to Ohm’s law, the ratio of voltage to current in a conductor is constant.
Answer: Option A
<u>Explanation:</u>
Ohm's law defines that an electric current flowing through the conductor between two ends is directly proportionate to the voltage at these two points. The introduction of a constant proportionality, resistance, gives a simple mathematical equation describing this relationship. Particularly, Ohm's law also mentions that R is constant in this respect, i.e. not dependent on the current.
Where,
I is the current conduction in amperes
V is the voltage calculated by the conductor in volts
R is the conductor’s resistance in ohms.