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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.
 
a) Squeezing a piece of lemon between the fingers to extract its juice.
 
Answer: Agents are , object is lemon, effect of force changes the shape of lemon.
 
b) Taking out paste from a toothpaste tube.
 
Answer: Agents are fingers of the person squeezing the tube, object is  and effect of the force can be observed as the paste coming out of the tube (change in shape).
 
c) A load suspended from a spring while its other end is on a hook fixed to a wall.
 
Answer: Agent is the  suspended, object is the spring and effort can be seen in the form of elongation of spring on suspension of load (change in shape).
 
d) An athlete making a high jump to clear the bar at a certain height.
 
Answer: Agent is  of athlete, object is athlete himself and effect of the force changes the state of motion of the athlete.