# BALANCING AND UNBALANCING

• BALANCING AND UNBALANCING
• FORCES
• There are many different forces like contact force, gravity force, inertia force, wind force, fluid pressure force, static force, thermal force, centrifugal , frictional force, pushing force, pulling force, seismic force, snow force, normal force, tangential force etc.
• Without a force no action like dancing, cycling, playing sports. Even a stationary object is under the action of its weight.
• The unit of force is Newton (N).1 Newton = accelerating an object of mass of 1 kg  at 1 m/s21 pound force =4.448 N
• 1 kg force= 9.81 N
• A force has both magnitude and direction and hence is a vector quantity like velocity/acceleration/displacement.
• A vector is represented by a line of certain length and an arrow placed at one end. The length of the line represents the magnitude of the force and the  arrow used to show the direction.
• A force is an effect which does the followings
•  Makes a stationary body to move
•  Accelerate a moving body
•  Retard a moving body
•  Stop motion
•  Change direction
•  Cause deformation
•  Remove deformation
• All or any one or two forces which act on objects.
• When forces act in pairs, these are either balanced or unbalanced.

BALANCED FORCE

• Balanced forces do not cause change in position or deformation or motion.
• They are equal in magnitude and opposite in direction and there is no net force.

UNBALANCED FORCE

• An unbalanced force always causes a change in motion or position or deformation.
• When unbalanced forces act in opposite directions you can find the net force.

Net force magnitude will be the difference between the two forces.

• Direction of the net force will be the direction of the largest force.
• If forces are balanced the object doesn’t move.
• If forces are unbalanced the object will do one of  the following things:
•  Begin to move
•  Stop moving
•  Changes direction
•  Speeds up
•   Slows down