Task 3 : Newton's 1st, 2nd and 3rd law of motion.

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 Explain Newton's 1st law, 2nd Law and 3rd Law of motion, with 1 example for each. 


NEWTON'S 1ST LAW OF MOTION. 

Newton's first law of motion was discovered by Sir Isaac Newton. It states about the inertial nature of an object. Newton's first law of motion states that an object will remain in its original state or in a state of uniform velocity if no external force acts on the object. 

An object that is stationary will remain stationary. For example, a stone in the ground is in a state of rest.  

The rock will remain stationary on the ground when no force is applied.

Therefore, to move the stationary object, an external force is required. 


The stationary stone moves when a force (throwing a stone) is applied to it.

When an object moving with uniform velocity it will keep moving with uniform velocity along a straight line. To change that condition, an external force must be acted on the object. 


NEWTON'S 2ND LAW OF MOTION

Newton's second law of motion states that the rate of change of momentum is directly proportional to the resultant force acting on the object in the same direction as the direction of action. 

Newton's second law of motion is better known by the formula F = ma 
Where: F is Force
             m is mass of an object and 
             a is acceleration. 

This means that all objects of constant mass under the influence of a non -zero resultant force F will experience acceleration. Thus, Newton's second law of motion is also known as the law of acceleration.

For example : 



When we ride a bicycle, we push on the pedals, our bicycle accelerates. We are increasing the speed of the bicycle by applying force to the pedals.


NEWTON'S 3RD LAW OF MOTION

Newton’s third law of motion states that for every force of action, there is one reaction force that has the same magnitude and acts in the opposite direction. The third law of motion is also known as the law of action and reaction. 

For example :


When we jump, our legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels us into the air.


SUMMARY 

Newton's first law of motion = know as law of inertia. 
  • moving objects will keep moving.
  • object at rest stay rest 
unless acted upon by an unbalancing force : Balanced and Unbalanced
Newton's second law of motion use F = ma. 
  • more force = more acceleration
  • more mass = less acceleration

Newton's third law of motion known as action and reaction. 
  • forces act in pairs. 





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