Newton's laws of motion are a set of physical laws discovered by Sir Isaac Newton [] which describe the motion of objects.
Laws of motionEdit
- Newton's 1st law of motion
- Newton's 2nd law of motion
- Newton's 3rd law of motion
Newton's 1st law of motionEdit
Every object or body continues to be in its state of rest or of motion unless acted upon by an external unbalanced force.
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
This law describes the inertial nature of any object. It says that any object has inertia on account of its state of motion and that inertia remains unchanged until the object is acted upon by an external force.
For example, on a frictionless surface, a ball would continue to remain at rest until pushed and once in motion, it will continue moving in a straight line until a force causes it to stop or change direction.
Newton's 2nd law of motionEdit
The rate of change of momentum of a body is equal to the force applied to that body and in the direction of the force.
The acceleration of an object is directly proportional to the force applied to that object, in the direction of the force.
This law is expressed by the equation, F = ma, where F is the net force acting on an object of mass m with acceleration a. Alternatively, if an object of mass m has an acceleration a (change in velocity with time) then the net force F acting upon that object is the product of its mass and acceleration. And also accelerates as it is moving.
Newton's 3rd law of motionEdit
Every action has an equal and opposite reaction.
This law states that if a force is applied by an object A upon another object B, then object B will also exert an equal and opposite force on object A.
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