Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 329 views

    Third Law of Motion and Its Application

    Uploaded by

    Qulb e Abbas
    Newton's third law of motion states that for every action, there is an equal and opposite reaction. Whenever two objects interact, they apply forces to each other - the action and reaction forces are equal in magnitude but opposite in direction. Examples given are a block on the ground exerting a downward force on the ground equal to its weight, with the ground exerting an upward force of equal magnitude on the block. Other applications discussed are a ball rebounding after striking the floor, walking by pushing backward on the ground, swimming by pushing water backward, and rocket propulsion working by exhaust gases pushing backward.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    Third Law of Motion and Its Application

    Uploaded by

    Qulb e Abbas
    329 views8 pages
    Newton's third law of motion states that for every action, there is an equal and opposite reaction. Whenever two objects interact, they apply forces to each other - the action and reaction forces are equal in magnitude but opposite in direction. Examples given are a block on the ground exerting a downward force on the ground equal to its weight, with the ground exerting an upward force of equal magnitude on the block. Other applications discussed are a ball rebounding after striking the floor, walking by pushing backward on the ground, swimming by pushing water backward, and rocket propulsion working by exhaust gases pushing backward.

    Original Description:

    "Third Law of Motion and Its Application" FOR THE STUDENTS OF CLASS 9

    Copyright

    © © All Rights Reserved

    Available Formats

    PPTX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    Newton's third law of motion states that for every action, there is an equal and opposite reaction. Whenever two objects interact, they apply forces to each other - the action and reaction forces are equal in magnitude but opposite in direction. Examples given are a block on the ground exerting a downward force on the ground equal to its weight, with the ground exerting an upward force of equal magnitude on the block. Other applications discussed are a ball rebounding after striking the floor, walking by pushing backward on the ground, swimming by pushing water backward, and rocket propulsion working by exhaust gases pushing backward.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    329 views8 pages

    Third Law of Motion and Its Application

    Uploaded by

    Qulb e Abbas
    Newton's third law of motion states that for every action, there is an equal and opposite reaction. Whenever two objects interact, they apply forces to each other - the action and reaction forces are equal in magnitude but opposite in direction. Examples given are a block on the ground exerting a downward force on the ground equal to its weight, with the ground exerting an upward force of equal magnitude on the block. Other applications discussed are a ball rebounding after striking the floor, walking by pushing backward on the ground, swimming by pushing water backward, and rocket propulsion working by exhaust gases pushing backward.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 8

    UNIT - 3

    THIRD LAW OF
    MOTION AND ITS
    APPLICATION
    Newton’s Third Law of Motion
    •  
    It states that to every action there is an equal and opposite reaction.
    According to Newton, whenever objects 1 and 2
    interact with each other, they exert forces upon
    each other. If an object 1 exerts force on object 2,
    then, object 2 will also exert force on object 1.
    These two forces are called action and reaction forces.
    and are the subject of Newton's third law of motion.
    Therefore, = -
    Thus, action and reaction are equal but opposite in direction.
    For example, when we placed a wooden block on the
    ground, this block exerts a force equal to its weight,
    W = mg, acting downwards to the ground. This is the
    action force. 
    The ground exerts an equal and opposite force
    W’ = mg, on the block in the upward direction.
    This is the reaction force.
    Applications of Newton’s Third Law of Motion
     When a ball is dropped from some height, it rebound
    after striking against the flour.
    When a ball strikes against the floor, it exerts a force
    (known as action) on the floor. According to Newton’s
    third law of motion, the floor exerts an equal and
    opposite force (known as reaction) on the ball.
    Due to this reaction, the ball rebounds.
     Newton’s third law of motion helps us in walking.
    When we walk, we push the ground in backward
    direction. This is known as action force (F). In turn,
    the ground gives an equal and opposite reaction (R).
    The horizontal component i. e. H = r cosθ of the
    reaction help the person to move in the forward
    direction.
    The vertical Component i. e. V = sinθ of the reaction(R)
    is balanced by the weight of the person.
     Newton’s third law helps a swimmer to swim.
    A swimmer pushes the water
    backward with his hands is
    called action. The reaction of
    water takes him in forward
    direction.
     A boatman pushes the river bank with a bamboo
    pole to take his boat into the river.
    When a boatman pushes
    the river bank with a bamboo
    pole, the river bank offers an
    equal and opposite reaction
    which helps the boat to move
    into the river.
     Rocket propulsion.
    The gases produced in the combustion
    chamber of a rocket engine come out of
    the rear of the rocket in the downward
    direction.
    The reaction of these exhaust gases
    pushes the engine in the upward
    direction.
     It is difficult to walk on sand or ice.
    As we press the sandy ground in backward direction, the sand
    gets pushed away and as a result, we get only very small
    reaction from the sandy ground and it makes difficult to walk
    on sand.
    In case of ice, due to little friction b/w our feet and the ice
    surface,
    there is hardly any forward reaction and hence we cannot
    walk.
     When a man jumps out of a boat, the boat is pushed
    away.
    When a man jumps out of
    a boat, he presses the boat
    in backward direction and
    in turn, the reaction of the
    boat pushes him out of the
    boat.
     Motion of a vehicle.
    A vehicle moves by pushing
    the ground in backward
    direction. The reaction of the
    ground pushes the vehicle in
    in the forward direction.

    You might also like