Mechanical Engineering Exam > Mechanical Engineering Questions > The static frictiona)bears a constant ratio t...
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The static friction
- a)bears a constant ratio to the normal reaction between the two surfaces
- b)is independent of the area of contact, between the two surfaces
- c)always acts in a direction, opposite to that in which the body tends to move
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
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The static frictiona)bears a constant ratio to the normal reaction bet...
Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from sliding down a sloped surface. The coefficient of static friction, typically denoted as μs, is usually higher than the coefficient of kinetic friction.
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The static frictiona)bears a constant ratio to the normal reaction bet...
Introduction:
Static friction is the force that prevents two surfaces from sliding past each other when a force is applied. It acts parallel to the surface and opposes the motion of the object. In this question, we are given four options about the characteristics of static friction and we have to determine which option is correct.
Explanation:
Let's analyze each option to determine if it is true or false:
Option a: The static friction bears a constant ratio to the normal reaction between the two surfaces.
This statement is true. The static friction force is directly proportional to the normal reaction force between the two surfaces. The normal reaction force is the force exerted by a surface to support the weight of an object resting on it. The static friction force can vary in magnitude, but it always maintains a constant ratio with the normal reaction force.
Option b: The static friction is independent of the area of contact between the two surfaces.
This statement is true. The static friction force does not depend on the area of contact between the two surfaces. It depends only on the nature of the surfaces in contact and the force pressing them together. The area of contact does not affect the magnitude of the static friction force.
Option c: The static friction always acts in a direction opposite to that in which the body tends to move.
This statement is true. The static friction force always acts in a direction opposite to the applied force that is trying to move the object. It prevents the object from sliding by providing an equal and opposite force to counteract the applied force.
Conclusion:
All the options mentioned in the question are true. The static friction does bear a constant ratio to the normal reaction between two surfaces, it is independent of the area of contact, and it always acts in a direction opposite to that in which the body tends to move. Therefore, the correct answer is option D (all of the above).
Static friction is the force that prevents two surfaces from sliding past each other when a force is applied. It acts parallel to the surface and opposes the motion of the object. In this question, we are given four options about the characteristics of static friction and we have to determine which option is correct.
Explanation:
Let's analyze each option to determine if it is true or false:
Option a: The static friction bears a constant ratio to the normal reaction between the two surfaces.
This statement is true. The static friction force is directly proportional to the normal reaction force between the two surfaces. The normal reaction force is the force exerted by a surface to support the weight of an object resting on it. The static friction force can vary in magnitude, but it always maintains a constant ratio with the normal reaction force.
Option b: The static friction is independent of the area of contact between the two surfaces.
This statement is true. The static friction force does not depend on the area of contact between the two surfaces. It depends only on the nature of the surfaces in contact and the force pressing them together. The area of contact does not affect the magnitude of the static friction force.
Option c: The static friction always acts in a direction opposite to that in which the body tends to move.
This statement is true. The static friction force always acts in a direction opposite to the applied force that is trying to move the object. It prevents the object from sliding by providing an equal and opposite force to counteract the applied force.
Conclusion:
All the options mentioned in the question are true. The static friction does bear a constant ratio to the normal reaction between two surfaces, it is independent of the area of contact, and it always acts in a direction opposite to that in which the body tends to move. Therefore, the correct answer is option D (all of the above).
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The static frictiona)bears a constant ratio to the normal reaction between the two surfacesb)is independent of the area of contact, between the two surfacesc)always acts in a direction, opposite to that in which the body tends to moved)all of the aboveCorrect answer is option 'D'. Can you explain this answer?
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