Monday, July 11, 2011

Science: Motion and Laws of Motion

Motion and Laws of Motion

Science: Motion
Motion is an act of changing position with respect to a reference point.
It can be measured by:
  • speed (scalar quantity) – m/s, km/hr, mi/s (magnitude) 
  • velocity (vector quantity) – m/s eastward (magnitude direction) 
  • acceleration – m/s2, km/hr2

Laws of Motion

Law of Inertia
  • The resistance to change in motion
Law of Acceleration
  • directly proportional with force and inversely proportional with mass; a=F/m
Law of Interaction
  • for every action, there is equal / opposite reaction
Law of Universal Gravitation
G=6.67 x 10-11
F=GM1M2/d2
W=mg

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