9th Class Science Sample Paper Sample Paper - 1 Term - 1

  • question_answer 23) State the action and reaction in the following cases, (i) A book lying on a table. (ii) Moving rocket (iii) A moving train colliding with a stationary train. (iv)Hammering a nail (v)Kicking a stone (vi) A person moving on the floor.  

    Answer:

    (i) Action Book exerts a force downwards equal to its weight. Reaction Table balances it by equal reaction in upward direction on the book. (ii) Action Rocket exerts force on the gases to expel them backwards. Reaction The gases exert equal and opposite force on the rocket.                                                                                           (1)             (iii) Action Force exerted on the stationary train. Reaction Moving train experience equal and opposite force. (iv) Action Force exerted on the nail. Reaction Hammer experiences an equal and opposite reaction.                                                                                                 (1) (v) Action Force exerted at the stone by foot. Reaction Stone exerts an equal reaction on foot by hurting it. (vi) Action Person pushes his foot against the ground backwards. Reaction Ground exerts an equal and opposite force on his feet.                                                                                              (1)           


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