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A block of 5 kg mass rests on a horizontal floor. The action of the block on the floor is
- a)50 N vertically upward
- b)5 N vertically upward
- c)5 N vertically downward
- d)50 N vertically downward
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A block of 5 kg mass rests on a horizontal floor. The action of the bl...
Weight of the block, mg = 5kg x 10 m/s2 = 50 N.
According to Newton’s third law, the action of the block, that is the force exerted on the floor by the block is equal to 50 N in magnitude and is directly vertically downward.
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A block of 5 kg mass rests on a horizontal floor. The action of the bl...
The correct answer is option 'D' - 50 N vertically downward.
Explanation:
When an object rests on a horizontal surface, there are typically two forces acting on it: the weight of the object and the normal force exerted by the surface.
1. Weight of the object:
The weight of an object is the force with which it is pulled downward due to gravity. It is given by the formula:
Weight = mass × acceleration due to gravity
In this case, the mass of the block is 5 kg. The standard value for acceleration due to gravity on the surface of the Earth is approximately 9.8 m/s². Therefore, the weight of the block is:
Weight = 5 kg × 9.8 m/s² = 49 N
2. Normal force exerted by the surface:
The normal force is the force exerted by a surface perpendicular to the surface. In this case, the block is resting on a horizontal floor, so the normal force exerted by the floor on the block is directed vertically upward.
According to Newton's third law of motion, the normal force exerted by the block on the floor is equal in magnitude but opposite in direction to the normal force exerted by the floor on the block. Therefore, the normal force exerted by the block on the floor is also 49 N (vertically downward).
However, the question asks for the action of the block on the floor, not the other way around. Since the block exerts a force equal in magnitude and opposite in direction to the normal force exerted by the floor, the action of the block on the floor is 49 N vertically upward.
Therefore, the correct answer is option 'D' - 50 N vertically downward.
It's important to note that the weight of an object always acts vertically downward, while the normal force exerted by a surface acts perpendicular to the surface and can vary depending on the circumstances.
Explanation:
When an object rests on a horizontal surface, there are typically two forces acting on it: the weight of the object and the normal force exerted by the surface.
1. Weight of the object:
The weight of an object is the force with which it is pulled downward due to gravity. It is given by the formula:
Weight = mass × acceleration due to gravity
In this case, the mass of the block is 5 kg. The standard value for acceleration due to gravity on the surface of the Earth is approximately 9.8 m/s². Therefore, the weight of the block is:
Weight = 5 kg × 9.8 m/s² = 49 N
2. Normal force exerted by the surface:
The normal force is the force exerted by a surface perpendicular to the surface. In this case, the block is resting on a horizontal floor, so the normal force exerted by the floor on the block is directed vertically upward.
According to Newton's third law of motion, the normal force exerted by the block on the floor is equal in magnitude but opposite in direction to the normal force exerted by the floor on the block. Therefore, the normal force exerted by the block on the floor is also 49 N (vertically downward).
However, the question asks for the action of the block on the floor, not the other way around. Since the block exerts a force equal in magnitude and opposite in direction to the normal force exerted by the floor, the action of the block on the floor is 49 N vertically upward.
Therefore, the correct answer is option 'D' - 50 N vertically downward.
It's important to note that the weight of an object always acts vertically downward, while the normal force exerted by a surface acts perpendicular to the surface and can vary depending on the circumstances.
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A block of 5 kg mass rests on a horizontal floor. The action of the block on the floor isa)50 N vertically upwardb)5 N vertically upwardc)5 N vertically downwardd)50 N vertically downwardCorrect answer is option 'D'. Can you explain this answer?
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