Slide 1 : NEWTON’S LAWS OF MOTION Presentation by
BYJA
ISAAC NEWTON : ISAAC NEWTON (1642-1727)
Laws of Motion : Laws of Motion There are three laws called, Newton’s Laws of Motion.
Law of Inertia
Conservation of momentum
3. Action- Reaction
First law : First law Every body continues its state of rest or of uniform motion until by an external unbalanced force acting on it. State of Motion
Inertia is the tendency of an object to resist changes in its state of
motion. But what is meant by the phrase state of motion? The state of
motion of an object is defined by its velocity- the speed with a direction.
Thus, inertia could be redefined as follows:
Inertia: tendency of an object to resist changes in its velocity. For more examples click here
Second Law : Second Law The acceleration of an object as produced by a
net force is directly proportional to the magnitude of the
net force, in the same direction as the net force, and
inversely proportional to the mass of the object. This
verbal statement can be expressed in equation form as follows:
a = Fnet / m
The above equation is often rearranged to a more familiar form as shown below. The net force is equated to the product of the mass times the acceleration.
Fnet = m * a
Slide 6 : Acceleration is produced when a force acts on a mass. The
greater the mass (of the object being accelerated) the greater
the amount of force needed (to accelerate the object).
Try to find the answer for the next problem…….??? : Try to find the answer for the next problem…….???
Slide 8 : Using what we know lets say that on the way to work my vehicle breaks down. My truck weighs 1000 Kg. As I am pushing my truck I am able to make it roll at 0.05 m/s2. Since you know Newton's Second Law of Motion you can calculate how much force (aka NEWTONS) I am pushing (applying to) on my truck.
Slide 9 : FORCE = MASS times ACCELERATIONFORCE = 1000 x .05FORCE = 50 NEWTONS Click here for more details
Third Law : Third Law For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of
forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.
The direction of the force on the first object is opposite to the direction of the force on the second object.
Forces always come in pairs - equal and opposite action-reaction force pairs. Click here.
Slide 11 :