4-1.Newton's Laws of Motion
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निम्नलिखित पर कार्यरत नेट बल का परिमाण व उसकी दिशा लिखिए

$(a)$ एकसमान चाल से नीचे गिरती वर्षा की कोई बूंद,

$(b)$ जल में तैरता $10\, g$ संहति का कोई कार्क,

$(c)$ कुशलता से आकाश में स्थिर रोकी गई कोई पतंग,

$(d)$ $30\, km\, h ^{-1}$ के एकसमान वेग से ऊबड़-खाबड़ सड़क पर गतिशील कोई कार,

$(e)$ सभी गुरुत्वीय पिण्डों से दूर तथा वैघुत और चुंबकीय क्षेत्रों से मुक्त, अंतरिक्ष में तीब्र चाल वाला इलेक्ट्रॉन।

Option A
Option B
Option C
Option D

Solution

$(a)$ Zero net force : The rain drop is falling with a constant speed. Hence, it acceleration is zero. As per Newton’s second law of motion, the net force acting on the rain drop is zero.

$(b)$ Zero net force : The weight of the cork is acting downward. It is balanced by the buoyant force exerted by the water in the upward direction. Hence, no net force is acting on the floating cork.

$(c)$ Zero net force : The kite is stationary in the sky, i.e., it is not moving at all. Hence, as per Newton’s first law of motion, no net force is acting on the kite.

$(d)$ Zero net force : The car is moving on a rough road with a constant velocity. Hence, its acceleration is zero. As per Newton’s second law of motion, no net force is acting on the car.

$(e)$ Zero net force : The high speed electron is free from the influence of all fields. Hence, no net force is acting on the electron.

Standard 11
Physics

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