Question

A mobile phone dropped from a height it breaks can be explained on the basis of: a. 1st law of motion b. second law of motion c. third law of motion d. conservation of momentum
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Answer 1

❒ Here is your answer:

According to the Newton's laws of motion, the above example can be explained on the basis of :

$\large{\bf \star \: \red { Newton \: third \: law \: of \: motion}}$

This laws states that whenever one body exerts a force on second body, the second body also exerts a equal in magnitude and opposite in direction force on the first body. Therefore, in better words, Every Action has its equal and opposite reaction.

❒ Explanation of above example:

• Mobile phone is falling from a certain height and will eventually fall on the ground.
• After falling, it will apply a force on the ground. This is the Action force.
• As a result, The ground will also exert force on the mobile due to which, it will break. This is the Reaction force.
• This was explained using Newton's 3rd law of motion.

❒ Now, question arises that....Why didn't the ground break, like the mobile phone?

• The answer is, Force is directly proportional to mass of any object.
• In this case, equal force is been applied on both the objects. And, we are aware about the Mass of ground and mass of mobile.
• Mass of ground is far greater than mass of mobile. Hence, there is negligible effect on ground, but the mobile broke.

✒ So, Correct option is (C) 3rd law of motion$.$

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Answer 2

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Newton third law

Newton's third law of motion satates that to every action there is an equal and opposite reaction. Action and reaction forces are equal in magnitude but opposite in direction

(refer to the attachment)

Newton second law

Newton’s second law of motion states that, the rate of change of momentum of a body is directly proportional to the force applied to it and takes place in the direction in which the force acts

Newton first law

Newton's first law states that a body stays at rest if it is at rest and moves with a constant velocity if already moving, until a net force is applied to it. In other words, the state of motion of a body changes only on application of a net non-zero force.