Wedge friction definition,application and PPT

  • What is Friction?

Friction is an example of a resistive force that always tries to oppose body that is moving in a direction of force applied. It varies with the surface with which body in contact.

shoe

Shoe soles are designed in such a way so that they generates frictional force between shoe and ground and prevent you from slipping.

  • Types of friction:

There are four types of friction:

  1. Static Friction

  2. Rolling Friction

  3. Fluid Friction

  4. Sliding Friction

Static and Sliding Friction

friction
source-vennage

They are all caused by particles moving against each other. First off, static & sliding friction is felt between solid objects. static friction is what allows you to climb a wall, Sliding friction is felt when 2 or more solid objects are moving against each other, observed in vehicles when they’re braking (brake pad against brake disc)

Rolling Friction

rolling friction
source=byjus.com

Rolling friction is felt when objects are rolling over surfaces. Examples of this are in all wheeled vehicles (wheel contacting the ground)

Fluid Friction

fluid friction

Fluid friction is between fluids (liquids and gasses). The most common example I can think of would be sky diving (parachute has fluid friction with the air), or a parachute anchor on small boats

  • Definition of wedge friction?

A wedge is a triangular shaped tool that is thicker on one end (the blunt end) and thinner on the other end (the edge.)

wedge
source: bunnings.com

A slice of pie in the shape of a wedge. It can be used to separate two objects, split an object, lift an object, or hold an object in place. So wedge friction is friction which acts on the ends of the wedge so that it is easy to use for various possible works.

  • The concept of wedge friction

How does it get power?

Its power comes from outside forces acting on it.

wedge friction

A wedge converts a force applied to its blunt end into forces perpendicular (at a right angle) to its inclined surfaces. Here force P is applied from the outside so that it would be easy to lift the block of mass W with less force.

A short wedge with a wide angle may do a job faster, but it requires more force than a long wedge with a narrow-angle.

How wedge friction makes work easier

The wedge might be the most important invention in human history.
Without wedges, we would not have been able to cut wood, hunt animals, or make clothing. A particular kind of wedge called the plow allowed human beings to farm the land.

Plough1

Advantages of wedge friction

Simple machines help us make work easier by applying a force over a greater distance. This fundamental idea enables the inclined plane to lift heavy objects with little effort, the wedge to easily cut rigid objects in two, and the screw to multiply a rotational torque into a linear force.

The mechanical advantage of a wedge can be calculated by dividing the height of the wedge by the wedge’s width.

The more acute, or narrow, the angle of a wedge, the greater the ratio of the length of its slope to its width, and thus the more mechanical advantage it will yield.

Applications of wedge friction

Wedges are commonly used for separating two objects.

axe

Wedges are also used in car carrying system.
Wedge friction is used in order to stop the car as a car stopper.

Common examples of this type of wedge include knives, axes, nails, scissors, and plows (British English: plows).

knife

Others are used to lift things or adjust the distance between them.
A long tapered piece of wood called a shim is used in carpentry to make fine adjustments.
Still, other wedges are used to hold things in place.
A doorstop is an example of this kind of wedge.

 

 

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