The nails provide a better grip and help the person to walk without slipping. This is the reason why people living in such regions wear boots with nails attached to the base. This lack of friction causes the objects present on the surface to slip and slide easily. The ice deposited over the ground surface or the land decreases the force of friction between the object and the surface. Hence, a person sliding down a slide is one of the best examples to demonstrate friction in real life.Ī sled sliding over an icy surface is yet another example of kinetic friction. This lack of grip and friction helps to execute the sliding action on a playing slide. A large friction coefficient allows the person to build a strong grip, whereas a small friction coefficient makes the surface slippery. This is done because the friction coefficient of smooth surfaces is less than the friction coefficient of rough surfaces. The surface of a playing slide is made as smooth as possible. It helps the climber to climb the rock and prevent his/her hands and feet from slipping. Rock climbing makes use of a force of friction to establish a proper grip between the feet/hand of the climber and the surface of the rock. This force is known as the force of friction. When a climber tends to move on the rock a force is felt in the opposite direction that tries to resist the motion. The force resisting the motion is applied in the direction opposite to the direction of motion of the hands is called the frictional force and is responsible to generate heat energy. When the hands are rubbed against each other, a force opposing this motion of the hands comes into action. Rubbing hands is an example of sliding friction. Walking through a pool filled with water and amidst a storm is difficult due to the presence of fluid friction. The frictional force presented by the air is called the air resistance force or the drag force. The opposition force presented by a liquid or a gas to the moving object is known as fluid friction. Roller skates, ball bearings, etc., are some of the applications where rolling friction can be clearly observed.Ī fluid is a substance that can flow and is able to take the shape of the container in which it is kept. It is much smaller than kinetic friction. When a body is made to roll over the surface of another body, rolling friction is said to be existing between them. Dragging a block kept on the table, writing, playing on a slide, etc., are some examples of sliding friction. Sliding friction is also known as kinetic or dynamic friction. Sliding friction exists when an object is dragged over the surface of another. Walking, rock climbing, etc., are some examples of static friction. When a force is applied to an object resting on a surface to put it into motion, the main requirement is that the magnitude of applied force must be higher than the force of friction provided by the surface. A force of friction that acts between an object and a surface on which the object is placed is known as static friction.
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