Physics, asked by SƬᏗᏒᏇᏗƦƦᎥᎧƦ, 4 months ago

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✴️ How can Newton's first law of motion can be obtained from the second law of motion?
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✴️ The area of cross section of press plunger of a hydraulic press is 4 m². It is required to overcome a resistive load of 400 kgf on it. Calculate the force required on the pump plunger if the area of cross section of the pump is 0.01 m².
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Anonymous: Answer 1-
To obtain Newton's first law of motion from second law of motion:
From Newton's second law, F=ma If F=0,then a=0;
This implies that when force in not applied on a body, the acceleration will be zero. If the body is at rest, it will continue to say at rest, when it in moving, it will continue to moves in the same direction will the same speed.
Hence, a body not acted upon by an external force, does not changes its state of rest or motion which is the statement of Newton's

Anonymous: Answer 2 = Load=900kgf, Effort(E)= ?
Area of cross section of the press plunger = a1= 9m2
Area of cross - section of the pump plunger = aa2 = 0.03m2
By Pascal's law,
Pressure exerted by pump plunger = pressure exerted on press plunger.
i.e, EL=a2a1⇒E900kgf = 0.03m29m2
⇒E=9m2900kgf×0.03m2=3kgf.

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Answers

Answered by iniyavan82

☆From Newton's first law of motion, F = ma. If F = 0, then a = 0. This means that if no force is applied on the body, its acceleration will be zero. If the body is at rest, then it will remain in the state of rest and if it is moving, then it will remain moving in the same direction with the same speed.

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Answered by radhebhai63

Explanation:

From Newton's second law of motion, F = ma. If F = 0, then a = 0. ... Thus, a body not acted upon by an external force, does not change its state of rest or motion. This is the statement of Newton's first law of motion.

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