Class 9 Physics Force and Laws of Motion Introduction


  • In our everyday life we observe that some effort is required to put a stationary object into motion or to stop a moving object.


  • By pushing, hitting and pulling objects we are bringing objects in motion. They move because we make a force act on them.


  • We know that force can be used to provide acceleration.
  • We also know that a force can change the shape and size of objects.





  • By blowing air into the balloon we are applying force , which causes change in its shape


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