Give two examples where friction is undesirable

Wiki User. An example of undesirable friction is when a cyclists falls and his face against pavement that skin on the road. Undesirable friction is something that is not controllable. The force of friction between two objects is the product of the normal force and the coefficient of friction.

If there is no friction between the contact surfaces, then a body can't be stopped without the application of external force. In the same time a person can't walk on the ground if there is no friction between the ground and our legs also no vehicle can run on the ground without the help of friction. Desirable effects of friction are: 1. It helps us in movement. It helps to stop a moving object like a car.

Give two examples where friction is undesirable

Can the same change be desirable at one time and undesirable at another? Explain with as an example. The eddy current have both desirable and undesirable effects. A desirable change is always associated with an undesirable change. Give as example. What is friction? Explain it with an example. Mention a change which is always a desirable b undesirable c periodic. Classify the following as desirable and undesirable changes. Soil erosion due to flood. Melting of ice cream. Explain friction in solids. Give examples.

Why Friction Occurs Friction occurs because no surface is perfectly smooth.

Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in the two Figures below Friction between the graphite in a pencil and a sheet of paper leaves a mark on the paper. Friction between a bicycle brake pad and the rim of a wheel causes the wheel to stop turning. Did you ever rub your hands together to warm them up, Why does this make your hands warmer?

When a body is in motion, it has resistance because the body interacts with its surroundings. This resistance is a force of friction. Friction opposes relative motion between systems in contact but also allows us to move, a concept that becomes obvious if you try to walk on ice. Friction is a common yet complex force, and its behavior still not completely understood. Still, it is possible to understand the circumstances in which it behaves. Friction is a force that opposes relative motion between systems in contact. There are several forms of friction. One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems and is always in a direction that opposes motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction.

Give two examples where friction is undesirable

Have you ever wondered what is friction and force? How do we relate them to our day-to-day activities? Friction is a natural phenomenon that occurs when there is contact between two objects. Where there is friction, there will be a loss of energy. Friction occurs due to the roughness of the rubbing surface. During friction, the molecules in the surface will interact with each other. The force of friction will depend on the material of the rubbing surface.

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Rotating bearings. If you've ever tried to push your open hand through the water in a tub or pool, then you've experienced fluid friction. Or you can put them on a dolly, like the one in the Figure below, and then roll them over the ground. Kabaddi players rub their hands with soil so that they get a better grip on their opponents. Sliding friction is weaker than static friction. Increasing the area of surfaces that are touching also increases the friction between them. Types of Friction Friction is the force that opposes motion between any surfaces that are in contact. Friction occurs because no surface is perfectly smooth. How does sliding friction help you ride a bike? Friction Produces Heat You know that friction produces heat. Document Information click to expand document information Original Title Friction-desirable-undesirable. Friction is always parallel to the surface in contact. Related Solutions Can the same change be desirable at one time and undesirable at another? Resistance of the air against the parachute slows his descent.

Friction is a force that is around us all the time that opposes relative motion between surfaces in contact but also allows us to move which you have discovered if you have ever tried to walk on ice.

Friction produces a lot of heat. Drop the pieces at the same time. As soon as an object starts moving what replaces static friction? Static friction acts on objects when they are resting on a surface. Report this Document. The force of friction between two objects is the product of the normal force and the coefficient of friction. That's why it's easier to slide a piece of furniture over the floor after you start it moving than it is to get it moving in the first place. Explain which way makes it easier to move the boxes. Did you find this document useful? Friction Desirable Undesirable. We can not fix nail in the wood or wall if there is no friction. Switch Flag Bookmark. Do this a few times to compact the rice and get rid of the air pockets. Depending on the circumstance, friction can be a help or a hindrance. It not only warms your hands.