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Gravity.

Which is the best explanation for the earth's gravity?.... If mass was responsible for the effects of gravity, this means that a more massive object's stronger attraction to the earth's mass, would fall faster then any less massive objects, when we know that this does not happen. Because all objects have to fall at the same rate of speed regardless of their mass... Where it is actually reverse gravity (centrifugal force) that neutralizes gravity's acceleration on an object, causing all objects to fall at the same rate of speed, regardless of their mass (which better conforms with experiments)...  Whenever we are in a fast traveling vehicle and it changes its direction of travel, we always experience a force. This is why we experience a force with centrifugal force because its rotation is "a constant change of direction", which creates a constant force (reverse gravity). Written: Alan Halonen.
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Optics

Optics is simply put as the scientific study of sight and light. The ways employed in producing images are through the camera & projector and the human eye. The simple lens camera is made up of a convex lens(in complex cameras, this is replaced by a system of lenses), a diaphragm,  a shutter,  a film and a film spool. The projector is made up of the small but powerful light source that illuminates the non-luminous transparent object,  the condenser  which is made up of two plano convex lenses which collects the light to evenly illuminate the film,  the slide carrier which is the framework in which the slide is placed upside down, so that it will appear erect on the screen. The projection lens which is placed in front of the slide to give a magnified, real and inverted image of the slide, but, because of this, the slide is placed upside down so that the image formed on the screen is in an erect position. Lastly, the screen, usually white, receives the i...
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Density

Physics-helper  Subject :- Density Hello guys Am Kolapo one of the admin @ Physics-helper And am sure at the end of this lesson you should be able to know more about Density The density of a substance is defined as the mass of the substance per unit volume Which can be expressed mathematically as :- D=M/V Where D= Density             M=Mass             V=Volume       Determination of Density Of A Solid 1) Regular shaped solid :-        The mass a regular shaped solid is obtained with the aid of a chemical balance. It's volume is calculated from the measurement made by using either the Vernier calipers or a micrometer screw guage depending on size and shape of the solid. The density can be obtained by using the formula D=m/v 2) Irregular shaped solid :-     The volume of an irregular shaped solid is found by displacement method Relative Den...
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