Give two examples where friction is undesirable

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.

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.

Give two examples where friction is undesirable

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? The answer is friction. Why Friction Occurs Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. Look at the metal surfaces in the Figure below. The aluminum foil is so smooth that it's shiny.

Physics Project Physics Project. The greater surface area of the soles of the shoes cause more friction and slow you down. You've got to add more friction.

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. The normal force is the component of force that is perpendicular to the plane of friction. The coefficient of friction is specific to the two materials, in this example the block of wood and the floor.

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. It also depends on the speed or intensity at which two surfaces come into contact with each other. To overcome friction, you need to work more and put extra effort. In contrast, force is any interaction that tends to change the motion of the object.

Give two examples where friction is undesirable

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Concept: Air friction. Fricitional Force Fricitional Force. To overcome friction a lot of energy is wasted. As soon as an object starts moving what replaces static friction? What is an undesirable change? Give examples to show that friction is both a friend and a foe. Still have questions? That's why there is greater air resistance against the parachute than the skydiver's body. Kabaddi players rub their hands with soil so that they get a better grip on their opponents. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids. Search inside document. Describe a situation in which static friction is useful?

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.

Is Friction is always undesirable true or false? Give example. Why friction is disadvategeous? Describe a situation in which static friction is useful? L 12 Friction L 12 Friction. List four types of friction. Look at the metal surfaces in the Figure below. If the friction is more between the block and inclined surface then a large force is required to push the block on the plane. Kinetic Friction replaces Static Friction when an object is in motion. Take a few pencils which are cylindrical in shape. Report this Document. Toggle navigation. This time, when you pull up on the chopstick, you should be able to pick up the whole bottle.