The presence of a lubricant layer, even a very thin one, fundamentally changes the nature of friction compared to dry contact. Friction in the presence of a lubricant film is known as film friction or lubricated friction. Depending on the film thickness and load, it can range from boundary lubrication (very thin film, contact between surface asperities still occurs) to hydrodynamic lubrication (thick film, surfaces completely separated by lubricant).
When the two surfaces in contact have a very thin layer of lubricant in between them, it is known as _____.
Asked in MPSC CS Prelims 2021 · Topic: Mechanics (Newton's Laws of Motion and their applications)
More Physics questions
- The displacement-time graph of a particle acted upon by a constant force is
- A person stands on his two feet over a surface and experiences a pressure P. Now the person stands on only one foot. He would experience a pressure of magnitude
- When the sun is 30° above the horizon, shadow of one tree is 17·3 m long. What is the height of this tree ?
- Two bodies A and B are moving with equal velocities. The mass of B is double that of A. In this context, which one of the following statements is correct?
- A racing car accelerates on a straight road from rest to a speed of 50 m/s in 25 s. Assuming uniform acceleration of the car throughout, the distance covered in this time will be
- The impulse on a particle due to a force acting on it during a given time interval is equal to the change in its
- The motion of a car along a straight path is shown by the following figure : [Figure shows a line starting from O (0km) and points A (25km), B (35km), C (60km) along the path] The car starts from O and reaches at A, B and C at different instants of time. During its motion from O to C and back to B, the distance covered and the magnitude of the displacement are, respectively
- The speed of a car travelling on a straight road is listed below at successive intervals of 1 s : Time (s) | 0 | 1 | 2 | 3 | 4 ------- | - | - | - | - | - Speed (m/s) | 0 | 2 | 4 | 6 | 8 Which of the following is/are correct? The car travels 1. with a uniform acceleration of 2 m/s². 2. 16 m in 4 s. 3. with an average speed of 4 m/s. Select the correct answer using the code given below :