1. State the universal law of gravitation.
2. What is the mathematical representation of universal law of gravitation?
3. What is free fall?
4. Write two differences between mass and weight.
5. State Archimedes Principle.
6. Write any 2 application of Archimedes Principle.
7. Define relative density and write it's SI unit.
Answers
1.UNIVERSAL LAW OF GRAVITATION
Newton law of gravitational is usually statedà as that every particle attracts every other particles in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
2.MATHEMATICAL REPRESENTATION OF UNIVERSAL LAW OF GRAVITATION
Newton universal law of gravitation every particle in the universe attracts every other particles with a force along a line joining them. in equation form F=GMmr2
3.FREE FALL
Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it
4.DIFFERENCE BETWEEN MASS AND WEIGHT
The terms "mass" and "weight" are used interchangeably in ordinary conversation, but the two words don't mean the same thing. The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon
5.ARCHIMEDES PRINCIPLE
Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.[1] Archimedes' principle is a law of physics fundamental to fluid mechanics. It was formulated by Archimedes of Syracuse.
6.2 APPLICATION OF ARCHIMEDES PRINCIPLE
Archimedes' principle allows the buoyancy of any floating object partially or fully immersed in a fluid to be calculated. The downward force on the object is simply its weight. The upward, or buoyant, force on the object is that stated by Archimedes' principle, above. Thus, the net force on the object is the difference between the magnitudes of the buoyant force and its weight. If this net force is positive, the object rises; if negative, the object sinks; and if zero, the object is neutrally buoyant—that is, it remains in place without either rising or sinking.
7.RELATIVE DENSITY
Relative density, or specific gravity,[1][2] is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, air at room temperature (20 °C or 68 °F) is the reference. The term "relative density" is often preferred in scientific usage. It is defined as a ratio of density of particular substance to that of water.