(a) Look at the given diagrams and answer the following questions :
(i) When a force is applied through the free end of the spring balance A' the reading on the spring balance 'A' is 20 g wt. What will be the reading shown by the spring balance 'B' ?
(ii) Write the reason for your answer.
(b) A balloon is filled with air. If its mouth is untied, air is released from its mouth in the downward direction. Write the other observations made by you. Justify your answer.
CBSE Class IX Science LA (5 Marks)
Answers
(a)(i)Spring balance B will show 20g wt.
(ii) It is because of Newton's third law of motion. When spring balance A exerts force on the balance B, balance B pulls balance A with an equal force of 20 g wt, but in the opposite direction. Balance A exerts a force of action on balance B, and then balance B exerts an equal and opposite force of reaction on balance A.
(b) It is observed that the balloon moves in the upwards direction. Air comes out from the balloon. It performs an action in the downward direction as a result of which there will be a reaction (equal in magnitude, but opposite in direction) in the form of upward motion.
Answer:
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Explanation:
When a force is applied through the free end of spring balance A, both the spring balances show the same readings on their scales. It means that the force exerted by spring balance A on balance B is equal but opposite in direction to the force exerted by the balance B on balance A. The force which balance A exerts on balance B is called the action and the force of balance B on balance A is called the reaction.