Applied Mechanics

Q1: Newtons's Law of Motion is :

A Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force

B The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

C To every action, there is always an equal and opposite reaction

D All the above.

ANS:D - All the above.

"All the above" refers to the statement that encompasses all three of Newton's Laws of Motion:

  1. Newton's First Law of Motion: "Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force."
  2. Newton's Second Law of Motion: "The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts."
  3. Newton's Third Law of Motion: "To every action, there is always an equal and opposite reaction."
Individually, each of these laws provides fundamental insights into the behavior of objects in motion and the forces that act upon them.
  • Newton's First Law, also known as the law of inertia, describes the natural tendency of objects to maintain their state of motion unless acted upon by an external force. This law is the reason why objects remain at rest or in uniform motion unless a force is applied to change their motion.
  • Newton's Second Law establishes the quantitative relationship between force, mass, and acceleration. It states that the force acting on an object is directly proportional to the rate of change of its momentum, which is the product of its mass and velocity.
  • Newton's Third Law highlights the concept of action and reaction. It states that for every action, there is an equal and opposite reaction. When one object exerts a force on another object, the second object simultaneously exerts a force of equal magnitude but in the opposite direction on the first object.



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