balanced and unbalanced

• Balanced Force

  Forces that are equal in magnitude and in opposite direction so there will be no motion in an object
• Unbalanced Force

  Forces that are unequal in size and cause a change in motion
• An object may be acted upon by several forces
• An object may be pushed and pulled in different directions at the same time
• Forces

  • Described in terms of magnitude
  • Direction
  • Line of action
• Magnitude

  Refers to the size or strength of the force
• The direction of the arrow indicates the direction of the force
• The length of the arrows represents the relative magnitude of the force
• If the force applied on the ball is doubled


  The length of the arrow is increased two times
• Line of action


  The straight line passing through the point of application and is parallel to the direction of force
• When forces are balanced, the object will remain stationary or travel at a constant motion
• When forces are unbalanced, the object will either accelerate or decelerate
• Net Force is the sum of all the forces acting on an object
• Characteristics of Balanced Forces

  • Equal in size
  • Opposite directional
  • Do not cause a change in motion
• Characteristics of Unbalanced Forces

  • Unequal in size
  • Direction varies
  • Cause a change in motion
• When two or more forces act on an object, the net force acting on it can be calculated using vector addition.
• If there are no external forces acting on an object, it will continue moving at constant velocity (no change in speed or direction).
• Unbalanced forces cause an object to accelerate.
• Vector Addition involves drawing vectors to represent the individual forces and then adding them together by placing their tails at the same point (the resultant). The magnitude and direction of the resultant vector represents the net force acting on the object.
• A free body diagram shows all the forces acting on an object.
• The resultant vector is found by calculating the angle between the first vector and the second vector, finding the length of both vectors, and combining them into one vector with the correct angle and length.
• Forces that oppose each other have opposite directions but may vary in magnitude.
• The magnitude of the resultant force depends on the magnitudes and directions of the individual forces involved.
• If the angles between the vectors add up to 180 degrees, they are said to be antiparallel and the resultant vector points in the opposite direction from the original vectors.