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force and laws of motion

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my ppt is based on forces and laws of motion and related to physics...hope u guyz will like it!

my ppt is based on forces and laws of motion and related to physics...hope u guyz will like it!

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  • 1.  
  • 2. FORCE
    • A PUSH OR PULL ON A BODY IS CALLED FORCE.
    • FORCES ARE USED IN OUR EVERYDAY ACTIONS LIKE PUSHING, PULLING, LIFTING, STRECHING, TWISTING AND PRESSING.
  • 3. EFFECTS OF FORCE
    • A force cannot be seen. A force can be judged only by the effects which it can produce in various bodies (or objects) around us.
    • A force can move a stationary body.
    • A force can stop a moving body.
    • A force can change the speed of a moving body.
    • A force can change the direction of a moving body.
    • A force can change the shape and size of a body.
  • 4. BALANCED AND UNBALANCED FORCE
    • THERE ARE TWO KINDS OF FORCE:
    • 1. BALANCED FORCE.
    • 2. UNBALANCED FORCE.
  • 5. BALANCED FORCES
    • If the resultant of all the forces acting on a body is zero, the forces are called balanced forces.
    • If a number of balanced forces act on a stationary body, the body continuous to remain in its stationary position.
    • If a number of balanced forces act on a body in uniform motion, the body continuous to be in its state of uniform motion.
    • Though balanced forces cannot produce motion in a stationary body but can change the shape of the body.
  • 6. UNBALANCED FORCE
    • If the resultant of all the forces acting on a body is not zero, the forces are called unbalanced forces.
    • When an unbalanced force acts on a body, it produces motion in the body. Also, an unbalanced can stop a moving body.
    • If there were no unbalanced force of friction or air resistance, a moving body would go on for ever.
  • 7. NEWTON’S LAW OF MOTION
    • NEWTON HAS GIVEN THREE LAWS OF TO DEFINE THE MOTION OF BODIES. THESE LAWS ARE KNOWN AS NEWTON’S LAWS OF MOTION.
  • 8. NEWTON’S FIRST LAW OF MOTION
    • A body at rest will remain in rest, and a body in motion will continue in motion in a straight line with uniform speed, unless it is compelled by an external force to change its state of rest or of uniform motion.
    • INERTIA: Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
  • 9. MOMENTUM
    • The momentum of a body is defined as the product of its mass and velocity.
    • NOTE: the force required to stop a moving body is directly proportional to its mass and velocity.
    • Thus, momentum= mass x velocity
    • or, p= m x v
    • where p= momentum
    • m= mass of the body and, v = speed of the body
    • SI UNIT = the SI unit of momentum is kilogram meters per second (kg.m/s)
  • 10. NEWTON’S SECOND LAW OF MOTION
    • The rate of change of momentum of a body is directly proportional to applied force, and takes place in the direction in which force acts.
    • Force= change in momentum/time taken
    • f= mv-mu/t
    • f= m(v-u)/t. But we know that v-u/t =a
    • f= m x a
    • force = mass x acceleration
    • SI UNIT: its SI unit is ‘force’.
  • 11. NEWTON’S THIRD LAW OF MOTION
    • Whenever one body exerts a force on another body, the second body exerts equal and opposite force to the first body. OR,
    • To every action there is equal and opposite reaction.
    • EX: the rocket works on the principal of action and reaction.
    • When a bullet is fired from the gun, a force sending the bullet forward is equal to the force sending the gun backward. But due to high mass of the gun, it moves only a little distance backward and gives jerk.
  • 12. CONSERVATION OF MOMENTUM
    • When two or more bodies act upon one another, their total momentum remains constant provided no external forces are acting.
    • Momentum is neither created nor destroyed.
    • Total momentum before collision = total momentum after collision
  • 13. THE END MADE BY: ASHUTOSH KUMAR CLASS:9 TH ‘C’ ARMY PUBLIC SCHOOL, RANIKHET