Answer the following questions : 1. Define the terms : (a) Friction (b) Drag 2. Describe any three ways to increase friction. 3. What is lubrication? How does it help in reducing frictio
Answers
Answer:
(a) The definition of friction is : Friction is a force between two surfaces that are sliding, or trying to slide, across each other. ... Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down
(b)Drag is the aerodynamic force that opposes an aircraft's motion through the air. ... If there is no fluid, there is no drag. Drag is generated by the difference in velocity between the solid object and the fluid. There must be motion between the object and the fluid. If there is no motion, there is no drag.
2)The three methods of increasing friction are: 1.) By applying more force to the object, 2.) By increasing the mass of the object that is causing friction, and 3.) By creating a rougher point of contact.
(3)Lubrication reduces the heat generated when two surfaces are in motion. It smoothes the process by forming a film between two surfaces that reduces friction and thus improves performance and efficiency.