force and laws of motion
Answers
Newton studied the ideas of Galileo and gave the three laws of motion. These laws are known as Newton’s Laws of Motion.
Newton's First Law of Motion - Any object remains in the state of rest or in uniform motion along a straight line, until it is compelled to change the state by applying external force.Newton's Second Law of Motion - The rate of change of momentum is directly proportional to the force applied in the direction of force.
Newton's Third Law of Motion - There is an equal and opposite reaction for every action.
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Force can change the direction of a moving object. For example; By applying force, i.e. by moving handle the direction of a running bicycle can be changed. Similarly by moving steering the direction of a running vehicle is changed.
Force can change the speed of a moving body – By accelerating, the speed of a running vehicle can be increased or by applying brakes the speed of a running vehicle can be decreased.
Force can change the shape and size of an object. For example -– By hammering, a block of metal can be turned into a thin sheet. By hammering a stone can be broken into pieces.
Forces are mainly of two types:
Balanced ForcesUnbalanced ForcesBalanced Forces
If the resultant of applied forces is equal to zero, it is called balanced forces.
Example : - In the tug of war if both the teams apply similar magnitude of forces in oppoisite directions, rope does not move in either side. This happens becasue of balanced forces in which resultant of applied forces become zero.
Balanced forces do not cause any change of state of an object. Balanced forces are equal in magnitude and opposite in direction.
Balanced forces can change the shape and size of an object. For example - When forces are applied from both sides over a balloon, the size and shape of balloon is changed.
Unbalanced ForcesIf the resultant of applied forces are greater than zero the forces are called unbalanced forces. An object in rest can be moved because of applying balanced forces.