In the following situations, identify the agent exerting the force and the object on which it acts

CBSE Class 8 CBSE Class 8 Science
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In the following situations, identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.

  1. Squeezing a piece of lemon between the fingers to extract its juice.
  2. Taking out paste from a toothpaste tube.
  3. A load suspended from a spring while its other end is on a hook fixed to a wall.
  4. An athlete making a high jump to clear the bar at a certain height.

Answer:

  1. In squeezing a piece of lemon, we make use of muscular force to extract its juice.
    This muscular force acts on the lemon. As a result, the shape of the lemon gets changed.
  2. We use our muscular force to take out paste from a toothpaste tube. The muscular force acts on the toothpaste tube. As a result, the shape of the tube gets changed.
  3. Here, the suspended load exerts a force on the spring and pushes the spring downwards. As a result, the spring gets stretched. Hence, its shape gets changed.
  4. An athlete pushes the ground with his feet. His feet exert a muscular force on the ground. This allows him to jump over the bar. As a result, his state of motion gets changed.