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Newton's first law of motion is also known as
1. Constancy principle
2. Principle of relativity
3. Causality principle
4. Principle of inertia

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Correct Answer - Option 4 : Principle of inertia

The correct answer is Principle of Inertia.

 

  • Newton's first law of motion states that an object at rest remains at rest and an object in motion remains in motion with the same velocity unless acted upon by what we call an unbalanced force which is also called the Principle of Inertia.
    • The force of gravity pulling down is balanced by the force of my kitchen table pushing up on my cup of coffee.
    • A stationary object with no outside force will not move.
    • With no outside forces, a moving object will not stop.
    • An astronaut who has their screwdriver knocked into space will see the screwdriver continue on at the same speed and direction forever.
    • An object at rest stays at rest.

 

  • Newton's Second Law of motion also called Law of Force and Acceleration states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. ie., F=ma where F is the force applied, m is the mass of the body, and a, the acceleration produced.
  • Newton's third law states that every action has an equal and opposite reaction. 
    • An example of Newton's third law of motion is when you jump your legs apply the force to the ground and the ground also applies the opposite force to your legs which propels you into the air.

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