Newton's laws of motion


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Newton's laws of motion

  1. 1. Basic help to solve physics home problems
  2. 2. Newton's laws of motion state the relationship between a body and the forces acting upon it, and its motion in response to the forces. There are three laws of motion which were compiled by Isaac Newton.
  3. 3.  An object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.  Newton's first law of motion is also known as the Law of Inertia.
  4. 4.  The vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration vector a of the object.  Newton's second law of motion is known as the Law of Acceleration
  5. 5.  When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.  Newton's third law of motion which is known as the Law of Action and Reaction.
  6. 6. Newton's first law  As per the law, if the net force is zero, then the velocity of the object is constant.  Velocity is a vector quantity which represents both the object's speed and the direction of its motion  The statement that the object's velocity is constant is a statement that both its speed and the direction of its motion are constant. The first law can be stated mathematically as Σ F = 0 => dV/dt = 0
  7. 7. Newton's second law As per the law the net force on an object is equal to the rate of change of its linear momentum. F = m(dV/dt) = ma where F is the net force applied, m is the mass of the body, and a is the body's acceleration.
  8. 8. Newton's third law As per the law all forces exist in pairs: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal and opposite: FA = −FB
  9. 9.  These three laws are excellent approximations at the macro scales and speeds of everyday life.  However, Newton's laws are inappropriate for use in certain situations like - at very small scales - very high speeds - very strong gravitational fields  Newton’s laws are very helpful to understand physics concepts.
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