Explain first law of motion.
Answers
Sir Isaac Newton first presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. His first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net force resulting from unbalanced forces acting on an object (if all the external forces cancel each other out), then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. And if an additional external force is applied, the velocity will change because of the force. The amount of the change in velocity is determined by Newton's second law of motion.
There are many excellent examples of Newton's first law involving aerodynamics. The motion of an airplane when the pilot changes the throttle setting of the engine is described by the first law. The motion of a ball falling down through the atmosphere, or a model rocket being launched up into the atmosphere are both examples of Newton's first law. The motion of a kite when the wind changes can also be described by the first law. We have created separate pages which describe each of these examples in more detail to help you understand this important physical principle.
Answer:
Explanation:
Newton's First law of motion is also called as law of Inertia.
It states that " every object which is at rest or uniform motion continues to be at the state of rest or in uniform motion unless it is compelled to change its state by action external net force."
Example :
1. When a driver applies a sudden break to a moving bus, the passenger tries to lean forward
explanation :
When bus is in motion, Passenger is also in the state of motion.
When driver applies sudden break, passenger leans forward because his legs which are in contact with bus comes to rest immediately but his upper part of body tries to be in motion due to inertia of motion .
Hence due to inertia of motion, he leans forward.