3. How is the heat produced by friction both an advantage and a disadvantage?
4. Organize the following types of friction in order from highest to lowest:
Sliding friction, static friction, rolling friction
5. Suggest two ways in which friction can be reduced.
6. What are the effects of force?
7. Give an example that force can change the shape.
8. Explain how the nature of the two surfaces in contact affect friction between them.
9. List two ways in which friction can be increased and two ways in which it can be
decreased to our advantage.if anyone wants to answer, answer all the questions. 6th std. today is my unit test plz reply fast.
Answers
3. The main disadvantage of friction is that it produces heat in various parts of machines. In this way some useful energy is wasted as heat energy. ... Due to friction, engines of automobiles consume more fuel which is a money loss.
4.There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.
5.There are several ways to reduce friction:
b.The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example.
a.Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.
6.A force acting on an object may cause the object to change shape, to start moving, to stop moving, to accelerate or decelerate. When two objects interact with each other they exert a force on each other, the forces are equal in size but opposite in direction
7.Examples of Forces that changes the shape of the objects: (i) Force of compression acting on the walls of an inflated ballon when it is pressed between our hands. (ii) The force acting on the dough when we roll a chapati/roti. (iii) The force acting on a spring or a rubber band when we stretch it.
8.Dependence of friction on the nature of two surfaces
Dependence of friction on the nature of two surfacesa)When the two surfaces are in contact are smooth, then the friction between them will be small because the interlocking of smooth surfaces is less.As the degree of roughness of the two surfaces in contact increases, the friction also increases.Mar
9.In layman's terms, friction is a force that resists one surface from sliding or rolling over another. Therefore, it can be said that friction only occurs when two surfaces are in relative motion, such as when a crankshaft is rotating in a journal bearing or when a ball bearing is rolling along its raceway.
In layman's terms, friction is a force that resists one surface from sliding or rolling over another. Therefore, it can be said that friction only occurs when two surfaces are in relative motion, such as when a crankshaft is rotating in a journal bearing or when a ball bearing is rolling along its raceway.A microscopic view of these surfaces in relative motion reminds us that each surface contains tiny, jagged asperities (rough and uneven surfaces), no matter how closely these surfaces are machined.
In layman's terms, friction is a force that resists one surface from sliding or rolling over another. Therefore, it can be said that friction only occurs when two surfaces are in relative motion, such as when a crankshaft is rotating in a journal bearing or when a ball bearing is rolling along its raceway.A microscopic view of these surfaces in relative motion reminds us that each surface contains tiny, jagged asperities (rough and uneven surfaces), no matter how closely these surfaces are machined.Without some form of separation, such as that formed by a lubricant film, these surface asperities may seize upon contact. At the very least, some abrasion, adhesion and/or ploughing of these asperities will take place as the movement occurs.