Enfold Learn

Balance and unbalanced forces

                                           

 Balanced Forces The famous English scientist, SIR Newton who lived between the 17th and 18th century, devised THREE LAWS OF MOTION. the primary law states that if all the FORCES working on an object are BALANCED there'll be NO ACCELERATION meaning either CONSTANT VELOCITY or the thing remaining STATIONARY. But what can we mean by balanced forces? Let's check out the instance of a horse. the primary force we'll consider is that the force of GRAVITY. This acts towards the centre of the world . the dimensions of the force of gravity is that the horse's WEIGHT. An arrow is drawn downwards from the horse towards the centre of the world . If this were the sole force working on the horse it might sink into the bottom . As this is often not the case there must be a force opposing the force of gravity. An arrow is drawn within the other way but equal in size. This force is named the REACTION FORCE. because the reaction force is that the same size but acts within the other way to the horse's weight, these two forces are a BALANCED PAIR OF FORCES. There are other forces working on the horse. The horse is moving forward, and thus , there must be a drive from the horse's legs. The drive , though, is opposed by forces trying to slow the horse down. And if the horse is travelling at a continuing VELOCITY, the force of FRICTION and AIR RESISTANCE are equal in size but opposite in direction to the drive . The drive is now balanced by friction and air resistance, a BALANCED PAIR OF FORCES. and therefore the horse now travels at a continuing VELOCITY. If, though, the horse ACCELERATES, the drive must be greater than friction and air resistance. The drive is now not balanced by friction and air resistance. These forces are now UNBALANCED. So in summary, when the forces are BALANCED on an object, the thing will either remain STATIONARY or travel at a continuing VELOCITY. When the forces are unbalanced, the thing will either ACCELERATE meaning an increasing velocity or DECELERATE meaning a decreasing velocity.