A .5 kg book rests on your desk. What is the reaction force to the weight of the book
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Answered by
5
-5 newton,
as the normal always act on the opp side and is always equal to the force applied
as the normal always act on the opp side and is always equal to the force applied
gbmaster:
for now lets take g = 10,
sry keyboard error
hence weight =mg hence m=0.05N since nnormal always accts opp int the direction of the force applied hence n=0.05 bt since the unit is in kg which is in weights and not mass hence we have to multiplie it by a facor of g to covert the unit back to kg(weight) and then again by a factor of g as it is acting opp of the pull of gravity
Answer in the book is confusing. It is saying that the reaction force is 4.9 N on earth. How?
By the way how did you wrote m 0.05 kg rather it is 0.5 kg.And if we take g=10 then weight or force acting on the table should be 5N
its 0.05 newton not kg as its mass not weight. and i took g=10 for simplicity just simplicity.
its specifically saying the reaction force is 4.9 on earth because the reaction force depends on gravity and the gravity of earth is 9.8 m/s
No I am not asking about the value of g but the main question is what is .05N. Are you trying to say that it is the force acting on table?
Specifically you are saying that 4.9 N is the rxn force on earth by the book. But what about the table?Is book not giving rxn force to table? Or it is dependent only on g. If one mass is put above the other can we say that they giving rxn force on earth and not on each other. If it is, then how?
Firstly you gave answer which I was expecting. Then you changed to your view. Please give me correct and meaningful explanation.
Answered by
2
Gravitational force is simply weight, so W = mg = 0.5*9.8 = 4.9N
The book does not accelerate(its still on the table unmoving), which means upward force must equal the downward forces. We have two downward forces, the weight of the book, 4.9N, and the hand, 6N. Together, its 10.9N. So since upward force must be equal to that, upward force is 10.9N.
The book does not accelerate(its still on the table unmoving), which means upward force must equal the downward forces. We have two downward forces, the weight of the book, 4.9N, and the hand, 6N. Together, its 10.9N. So since upward force must be equal to that, upward force is 10.9N.
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From where this hand came?There is no work of it. Book is kept on the table and there is no role of hand in it. By the way the question is about reaction force of book whose answer is confusing. It is 4.9 N force on earth.
Reaction force = mass×acceleration due to gravity = 0.5×9.8 = 4.9 N
this is the answer
Gravitational force is simply weight, so W = mg = 0.5*9.8 = 4.9N
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