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Types of friction

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Erlys Sanchez

This document discusses different types of friction including kinetic friction, which occurs when objects are moving, and static friction, which occurs when an object is not moving but a force is being applied. It describes how kinetic friction is useful for braking and writing, while static friction prevents objects from moving when a force is applied. The document also notes that friction can be both harmful by causing wear, and helpful by enabling movement and gripping. One way to reduce friction mentioned is by using lubricants like oil, wax and grease between surfaces.

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LOGO Types of Friction
Kinetic: Moving Example: Sliding books across a tabletop. Static: Not Moving Example: When you push on a piece of furniture and it doesn´t move
Kinetic Energy Kinetic friction is very useful in everyday life. You use sliding kinetic friction when you apply the brakes on a bicycle and when you write with a pencil or a piece of chalk. You also use sliding kinetic friction when you scratch a part of your body that is itchy! Rolling kinetic friction is an important part of almost all means of transportation. Anything that has wheels— bicycles, in-line skates, cars, trains, and planes—uses rolling kinetic friction.
Kinetic Energy
Static Energy When a force is applied to an object but does not cause the object to move, static friction occurs. The object does not move because the force of static friction balances the force applied. Static friction can be overcome by applying a large enough force. Static friction disappears as soon as an object starts moving, and then kinetic friction immediately occurs. Look at Figure 4 to understand under what conditions static friction affects an object.
Static Energy
Static Energy
HARMFUL OR HELPFUL??? Friction is both harmful and helpful to you and the world around you. Friction can cause holes in your socks and in the knees of your jeans. Friction by wind and water can cause erosion of the topsoil that nourishes plants. On the other hand, friction between your pencil and your paper is necessary to allow the pencil to leave a mark. Without friction, you would just slip and fall when you tried to walk. Because friction can be both harmful and helpful, it is sometimes necessary to decrease or increase friction.
LOGO How can we reduce friction?
One way to reduce friction is to use lubricants. Lubricants are substances that are applied to surfaces to reduce the friction between the surfaces. Some examples of common lubricants are motor oil, wax, and grease. Lubricants are usually liquids, but they can be solids or gases. An example of a gas lubricant is the air that comes out of the tiny holes of an air-hockey table.

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Types of friction

  • 2. Kinetic: Moving Example: Sliding books across a tabletop. Static: Not Moving Example: When you push on a piece of furniture and it doesn´t move
  • 3. Kinetic Energy Kinetic friction is very useful in everyday life. You use sliding kinetic friction when you apply the brakes on a bicycle and when you write with a pencil or a piece of chalk. You also use sliding kinetic friction when you scratch a part of your body that is itchy! Rolling kinetic friction is an important part of almost all means of transportation. Anything that has wheels— bicycles, in-line skates, cars, trains, and planes—uses rolling kinetic friction.
  • 5. Static Energy When a force is applied to an object but does not cause the object to move, static friction occurs. The object does not move because the force of static friction balances the force applied. Static friction can be overcome by applying a large enough force. Static friction disappears as soon as an object starts moving, and then kinetic friction immediately occurs. Look at Figure 4 to understand under what conditions static friction affects an object.
  • 8. HARMFUL OR HELPFUL??? Friction is both harmful and helpful to you and the world around you. Friction can cause holes in your socks and in the knees of your jeans. Friction by wind and water can cause erosion of the topsoil that nourishes plants. On the other hand, friction between your pencil and your paper is necessary to allow the pencil to leave a mark. Without friction, you would just slip and fall when you tried to walk. Because friction can be both harmful and helpful, it is sometimes necessary to decrease or increase friction.
  • 10. One way to reduce friction is to use lubricants. Lubricants are substances that are applied to surfaces to reduce the friction between the surfaces. Some examples of common lubricants are motor oil, wax, and grease. Lubricants are usually liquids, but they can be solids or gases. An example of a gas lubricant is the air that comes out of the tiny holes of an air-hockey table.