The force is an important factor in the field of mechanics,which may be broadly *defined as an agent which produces or tends to produce,destroys or tends to destroy motion e.g., a horse applies force to pull a cart and to set it in motion.Force is also required to work on a bicycle pump.In this case,the force is supplied by the muscular power of our arms and shoulders.
It may be noted that the force may have either of the two functions i.e., produces or tends to produce motion. The second part of the definition is an application of the first part. In statics,we consider the second function of the force only i.e.,'tends to produces motion.'
sometimes,the applied force may not be sufficient to move a body,e.g if we try to lift a stone weighing 2 or 3 quintals,we fail to do so. In this case we exert a force, no doubt,but no motion is produced.This shows that a force may not necessarily produce a motion in a body ;but it may, simply, tend to do so.In a tug-of-war the two parties, when balanced,neutralize each other's force .But the moment one party gets weaker,the other party pills off,in spite of first party's best effort to destroy motion.
EFFECTS OF A FORCE
A force may produces the following effects in a body,on which it acts:
1. It may change the motion of a body ,i.e if a body is at rest,the force may set it in motion.And if the body is already in motion,the force may accelerate it.
2. It may retard the motion of a body.
3.It may retard the forces,already acting on a body,thus bringing it to rest or in equilibrium.
4. It may give rise to the internal stresses in the body,on which it acts.
CHARACTERISTICS OF A FORCE
In order to determine the effect of a force,acting a on a body,we must know the following characteristics of a force:
It may be noted that the force may have either of the two functions i.e., produces or tends to produce motion. The second part of the definition is an application of the first part. In statics,we consider the second function of the force only i.e.,'tends to produces motion.'
sometimes,the applied force may not be sufficient to move a body,e.g if we try to lift a stone weighing 2 or 3 quintals,we fail to do so. In this case we exert a force, no doubt,but no motion is produced.This shows that a force may not necessarily produce a motion in a body ;but it may, simply, tend to do so.In a tug-of-war the two parties, when balanced,neutralize each other's force .But the moment one party gets weaker,the other party pills off,in spite of first party's best effort to destroy motion.
EFFECTS OF A FORCE
A force may produces the following effects in a body,on which it acts:
1. It may change the motion of a body ,i.e if a body is at rest,the force may set it in motion.And if the body is already in motion,the force may accelerate it.
2. It may retard the motion of a body.
3.It may retard the forces,already acting on a body,thus bringing it to rest or in equilibrium.
4. It may give rise to the internal stresses in the body,on which it acts.
CHARACTERISTICS OF A FORCE
In order to determine the effect of a force,acting a on a body,we must know the following characteristics of a force:
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