BALANCING AND UNBALANCING–Introduction
- BALANCING AND UNBALANCING
- 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
- To make a stationary body to move
- To accelerate a moving body
- To retard a moving body
- To stop motion
- To change direction
- To cause deformation
- To 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 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.
- 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