Define Newton three laws
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Answer:
The laws are: (1) Every object moves in a straight line unless acted upon by a force. (2) The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass. (3) For every action, there is an equal and opposite reaction.
Answer:
Defining Newton's law
Explanation:
First law
NEWTON'S FIRST LAW OF MOTION
Linear motion (also called rectilinear motion) is a one-dimensional motion along a straight line, and can therefore be described mathematically using only one spatial dimension.
We have read the linear motion. Now the question arises : what is the cause of motion what produces motion in an object)? It is our common experience that a force is to be applied on an object to produce motion in it.
Examples : To move a cycle, the cyclist has to apply force on its pedal. In a car, the petrol engine provides the force needed to move the car. To move a horse-cart, the horse applies force by stretching its muscles. To move a boat ahead, a force is applied by the oar on the water to push it backward and the force of reaction exerted by water moves the boat ahead to body is set even when motion is other force motion. Fr know that certain dis stops due and the g the grour smooth Tonger di. it would of frict remaine Thus, force o object words, a bod force F .
Before Galileo, scientists were of the view that a force is needed not only to start a motion but also to keep an object moving even with uniform velocity In other words, an object remains in motion so long as the external force applied to produce motion remains present (i.e., a force must act continuously with u to keep the body in motion). This view was based on the observation that the motion of a body ceases when the st force is withdrawn from it.
Examples: A cycle remains moving so long the of ine force is applied on its pedal. If we stop pushing the pedal, the cycle stops. Similarly, if we turn off the engine of a car, the car stops. The horse-cart stops after the horse stops moving and the boat stops after we stop pushing the oar.
Second Law
LINEAR MOMENTUM (p = mv) It is our common experience that if two bodies
of different masses are moving with the same velocity and they are brought to rest in same time, the force needed to stop the heavier body is more than that for the lighter body. Similarly, if two bodies of the same mass are moving with different velocities, then to stop them in the same time, the force needed for the faster moving body is more than for the slower moving body. Thus, the force needed to stop a moving body in a definite time depends both on the mass of the body and its velocity. Actually the force needed to stop a moving body in a given time depends on the product of both the mass and velocity, which is called the linear momentum of the moving body. Thus
Linear momentum of a body is the product of its mass and velocity.
The linear momentum of a body is denoted by the letter p. The word momentum is generally used for linear momentum. For a body of mass m moving with velocity v, linear momentum p is expressed as
It's formula p = my
Third Law
NEWTON'S THIRD LAW OF MOTION
Newton's first law tells us that to bring a change in the state of rest or in the state of motion of an object, a force is needed i.e., a force produces a change in velocity of the object. Newton's second law tells us about the magnitude of acceleration produced by the force when applied on the object. These two laws do not explain how the force acts on the object. This question is answered by Newton's third law, which states :
Statement : To every action there is always an equal and opposite reaction.
Examples :
(1) Consider a book lying on a table. The weight
of the book acts vertically downwards, but the book does not move downwards. It implies that the resultant force on the book is zero, which is possible only if the table exerts an equal upward force on the book, equal to the weight of the book. This spring of force on the book balances the weight of the book.