In longitudinal waves, the motion of the particles in a medium is across the direction of the wave.
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Static electricity occurs due to an imbalance in positively and negatively charged atoms. An example of this is when you take your clothes out of the dryer, and feel a slight sting when touching them. Another example of static electricity is lightning.
Current electricity occurs when there is a constant flow of electrons, such as in plug-operated machinery or anything operated using a battery. :)
It has been known that the discovery of machines have been one of the most beneficial inventions of all time. These simple machines include levers, wheels gears, pulleys and wedges. Among these machines, lever is more likely confused and associated with hydraulics. To differentiate the two; a lever is machine that has inverse effect of one side when a force is applied on the other side, for example a seesaw. While hydraulic machine is quite more complicated than the aforementioned machines and uses liquid power to do simple work like that of an excavator.
Answer:
B. MASS & MATTER
Explanation:
Newton's law also states that the strength of gravity between any two objects depends on two factors: the masses of the objects and the distance between them. Objects with greater mass have a stronger force of gravity between them.