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Weight and normal reaction forces
  • a)
    always act opposite to each other
  • b)
    act through the centre of gravity of the body
  • c)
    constitute action reaction forces
  • d)
    are both contact forces
Correct answer is option 'B'. Can you explain this answer?
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Weight and normal reaction forcesa)always act opposite to each otherb)...
In a simple case such as an object resting upon a table, the normal force on the object is equal but in opposite direction to the gravitational force applied on the object (or the weight of the object), that is, , where m is mass, and g is the gravitational field strength (about 9.81 m/s2 on Earth).


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Weight and normal reaction forcesa)always act opposite to each otherb)...
Weight and normal reaction forces act through the centre of gravity of the body.
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Weight and normal reaction forcesa)always act opposite to each otherb)...
Correct answer is option 'B'
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Journey through the center of earth:Suppose you could dig a tunnel from one surface to the opposite through the centre of the Earth. How will the journey be through the tunnel? Let us assume that the Earth to be of uniform density, there is no air friction and temperature is normal. At the starting point the initial acceleration will be g = 9.8 m/s2.The acceleration gradually reduces as one approaches the center.The gravity at any radius reff is less than REarth and is linearly proportional to the distance from the center. So, the weight will goes on reducing as the centre is approached. It will again goes on increasing as one moves from away from the centre. The traveller will pop up on the opposite side of the Earth within 42 minutes approximately. But unless the traveller grabs something to hold on, he or she will fall back for a return journey and continue to oscillate with a round-trip time. The time period will beHow the acceleration due to gravity varies inside the tunnel?

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Weight and normal reaction forcesa)always act opposite to each otherb)act through the centre of gravity of the bodyc)constitute action reaction forcesd)are both contact forcesCorrect answer is option 'B'. Can you explain this answer?
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