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  • 1. PHYSIC
    Newton’s Laws Of Motion
    Name : Norhasnida Bt Abd. Rahman
    Unit : PPISMP Sains Semester 1
    Lecturer : Miss RoshidahBinti Mat
  • 2. NEWTON’S FIRST LAWS
    Laws of inertia.
    Inertia-tendency of an object to resist changes in its velocity.
  • 3. CONCEPTS OF INERTIA
    If an object is at rest, it tends to stay in that position unless some forces puts that object into motion, inertia makes the moving object continue to move at a constant speed in the same direction unless some external force changes the object's motion.
  • 4. There are two parts to this statement - one which predicts the behavior of stationary objects and the other which predicts the behavior of moving objects. The two parts are summarized in the following diagram:
  • 5.
  • 6. Situation of Inertia
  • 7. RELATIONSHIP BETWEEN MASS AND INERTIA
    Two empty buckets which are hung with rope from a the ceiling.
    One bucket is filled with sand while the other bucket is empty.
    Then, both pails are pushed.
    It is found that the empty bucket is easier to push compared to the bucket with sand.
    The bucket filled with sand offers more resistance to movement.
    When both buckets are oscillating and an attempt is made to stop them, the bucket filled with sand offers more resistance to the hand (more difficult to bring to a standstill once it has started moving)
    This shows that the heavier bucket offers a greater resistance to change from its state of rest or from its state of motion.
    An object with a larger mass has a larger inertia.
  • 8. RELATIONSHIP BETWEEN MASS AND INERTIA
    MASS
    INERTIA
    =
    The LARGER the mass, the LARGER the inertia
  • 9. RELATIONSHIP BETWEEN INERTIA AND SPEED
    NERTIA
    INERTIA
    SPEED
    The greater the speed the greater the inertia
  • 10. Concept
    Concept
    Effect
    Effect
    Example
    Example
  • 11. momentum
    =Mass x velocity
    = mv
    SI unit: kg ms-1
    Momentum
  • 12. Principle of conservation of momentum
    EXTERNAL
    FORCE
    TOTAL MOMENTUM
    CONSTANT
    In the absence of an external force, the total momentum of a system remains unchanged.
  • 13. ELASTIC COLLISION
    Both objects move independently at their respective velocities after the collision.
    Kinetic energy is conserved.
    Momentum is conserved
    Total energy is conserved
  • 14. Total Momentum Before = Total Momentum After
    m1u1 + m2u2 = m1v1 + m2v2
  • 15. INELASTIC COLLISION
    The two objects combine and move together with a common velocity after the collision.
    Kinetic energy is not conserved
    Momentum is conserved
    Total energy is conserved
  • 16. Total Momentum Before = Total Momentum After
    m1u1 + m2u2 = (m1 + m2) v
  • 17. explosion
  • 18. EXAMPLE
    OF
    EXPLOSION
  • 19. Newton’s Second Laws
    concerned with the effect that unbalanced forces have on motion.
    An unbalanced force acting on an object causes it to accelerate
    The bigger the unbalanced force acting on the object the bigger the acceleration of the object.
    UNBALANCED FORCE
    ACCELERATION
  • 20. RELATIONSHIP BETWEEN FORCE AND MASS
    MASS
    FORCE
    CONSTANT ACCELERATION
  • 21. F is constant
    m is constant
    a
  • 22. Force, Mass & Acceleration
    The acceleration produced by a force on an object is directly proportional to the magnitude of the net force applied and is inversely proportional to the mass of the object. The direction of the acceleration is the same as that of the net force .
    When a net force, F, acts on a mass, m it causes an acceleration, a.
  • 23.
  • 24. Newton’s third laws
    For every action, there is an equal and opposite reaction
  • 25. CONCEPT OF NEWTON’S THIRD LAWS
    According to Newton, whenever objects A and B interact with each other, they exert forces upon each other. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.
  • 26. Example
    Of
    Newton’s Third Laws
  • 27.
  • 28. Newton’s 3rd Law in Nature
    • Consider the propulsion of a fish through the water. A fish uses its fins to push water backwards. In turn, the water reacts by pushing the fish forwards, propelling the fish through the water.
    • 29. The size of the force on the water equals the size of the force on the fish; the direction of the force on the water (backwards) is opposite the direction of the force on the fish (forwards).
  • NEWTON’S LAWS CONCEPT MAP
  • 30. SUMMARY