Mechanics

• Scalar

  Has magnitude only

  Example : Mass, Time, Volume
• Vector

  Has both magnitude and direction

  Example : Force, Velocity
• Distance

  The length from one point to another
• Displacement

  Distance in a given direction
• Speed

  The rate of change of distance
• Velocity

  the rate of change of displacement
• Acceleration

  the rate of change of velocity
• Force

  is that which can cause an acceleration
• Mass

  The mass of a body is the quantity matter in it
• Momentum

  Is the product of Mass times Velocity
• Newton’s 1st Laws of Motion

  states that every object will remain in a state of rest or traveling with a constant velocity unless an unbalanced external force acts on it
• Newton’s 2nd Laws of Motion

  states that the rate of change of an object’s momentum is directly proportional to the force which caused it
• Newton’s 3rd Laws of Motion

  states that if an object A exerts a force on an object B, then B will exert an equal but opposite force on A
• Principle of conservation of momentum

  states that in any collision between two objects, the total momentum before impact equals total momentum after impact provided no external force act on it
• Work

  is done when a force move its point of application
• Energy

  is the ability to do work
• The unit of work is Joule ( 1 joule is done when a force of One Newton moves its point of application 1 meter )
• Newton’s Universal Law of Gravitation

  states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square on the distance between them