Coulomb friction is the friction between
A. Bodies having relative motion
B. Two dry surfaces
C. Two lubricated surfaces
D. Solids and liquids
Answer: Option B
Solution(By Examveda Team)
Coulomb friction, also known as dry friction, is the friction that occurs between two dry surfaces in contact with each other. It is called "dry" friction because it applies to surfaces without any lubrication or liquid film between them.Therefore, the correct answer is Option B: Two dry surfaces. This option accurately describes the type of surfaces between which Coulomb friction occurs. Coulomb friction is a fundamental concept in engineering mechanics and is commonly encountered in various mechanical systems and applications.
Options A, C, and D do not correctly describe the nature of Coulomb friction.
This Question Belongs to Mechanical Engineering >> Engineering Mechanics
Join The Discussion
Comments ( 4 )
The resultant of two equal forces P making an angle $$\theta ,$$ is given by
A. $$2{\text{P}}\sin \frac{\theta }{2}$$
B. $$2{\text{P}}\cos \frac{\theta }{2}$$
C. $$2{\text{P}}\tan \frac{\theta }{2}$$
D. $$2{\text{P}}\cot \frac{\theta }{2}$$
A. Equal to
B. Less than
C. Greater than
D. None of these
If a number of forces are acting at a point, their resultant is given by
A. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2}$$
B. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2}} $$
C. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)$$
D. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)} $$
A. $${\text{a}} = \frac{\alpha }{{\text{r}}}$$
B. $${\text{a}} = \alpha {\text{r}}$$
C. $${\text{a}} = \frac{{\text{r}}}{\alpha }$$
D. None of these
B right answer
it is the friction between two dry surfaces. the answer given is incorrect.
Two dry surfaces
Answer is B