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Basics for PSC

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  1. The gravitational force is a force that attracts any two objects with mass.
  2. The motions of ocean water are waves, tides and ocean currents.
  3. The horizontal motion refers to the ocean currents and waves. The vertical motion refers to tides.
  4. Ocean currents are the continuous flow of huge amount of water in a definite direction while the waves are the horizontal motion of water.
  5. Gravity is a non-contact force. It means that it is a force which acts on an object without coming physically in contact with it.
  6. Mass is a dimensionless quantity representing the amount of matter in a particle or object.
  7. Spring tides occur twice a month, one on full moon period and another during new moon period.
  8. The gravitational constant, G, is defined as 6.67 x 10 -11 N-m2/kg2
  9. Once launched into orbit, the only force governing the motion of a satellite is the force of gravity.
  10. Gravitational force in moon is 1.62 m/s².
  11. The discovery of calculus is often attributed to two men, Isaac Newton and Gottfried Leibniz.
  12. Unit of force is Newton.
  13. Value of gravity at equator is 9.780 m/s2
  14. Value of gravity at poles is 9.832 m/s2
  15. 1 Kilogram = 9.81 Newton

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