# How do you find the equivalent resistance in A and B?

1. ∵6Ω and 3Ω are in parallel.
2. Also, 4Ω and 12Ω are in parallel.
3. Therefore, equivalent Resistance between A and B is 5Ω

## What is the force of the wall on the ladder?

A ladder is leaning against the wall. At the base of the ladder, there are two forces acting, the normal force of the floor on the ladder and the frictional force. At top of the ladder there is a normal force due to the wall. The gravitational force is acting at the center of the ladder.

## Which equations of equilibrium are used in ladder problem?

This problem is statically determinate; i.e. the three reaction forces (R1,R2,R3) are uniquely solvable from the three equations of static equilibrium in which the net horizontal force, net vertical force, and rotational moment about any point at rest all vanish.

R=1+√5=(1+2.236)

## How do mechanics solve friction problems?

The ladder is acted upon by the following set of forces:1 Weight W acting downwards at its mid point. 2 Normal reaction Rh and friction force Fh = µRh at the end B leaning against the wall. Since the ladder has a tendency to slip downwards the friction force will be acting upwards.

## What is the equation for static friction?

The formula to calculate the static friction is given as: Static Friction = Normal Force x Static Friction coefficient.

## Can you climb a ladder without friction?

d) climb a vertical ladder: Intuitively you may climb, but still see, there is no friction and the contact force of your foot and the ladder is required. So, you will not get the normal reaction. Without normal reaction, it is impossible to climb the ladder.

## What force is equal to the normal force from the wall acting on the ladder?

Actually, there must be a horizontal force acting somewhere on the ladder to require an equal and opposite normal reaction force on the wall for equilibrium. That horizontal force acting on the ladder is the friction force at the base of the ladder.

## What are the 3 equations of equilibrium?

In order for a system to be in equilibrium, it must satisfy all three equations of equilibrium, Sum Fx = 0, Sum Fy = 0 and Sum M = 0. Begin with the sum of the forces equations. The simplest way to solve these force systems would be to break the diagonal forces into their component pars.

## What are the three conditions of equilibrium?

A solid body submitted to three forces whose lines of action are not parallel is in equilibrium if the three following conditions apply : The lines of action are coplanar (in the same plane) The lines of action are convergent (they cross at the same point) The vector sum of these forces is equal to the zero vector.

## How do you calculate the equilibrium force?

1. A very basic concept when dealing with forces is the idea of equilibrium or balance. In general, an object can be acted on by several forces at the same time.
2. F1 = – F2 for the coordinate system shown with the letter X below the ball.
3. F1 + F2 = F net = 0.
4. F1 > – F2.

## How do you find the resistance of A ladder?

4)the effective resistance will be R(e)= r + R(e)*r/R(e)+r 5) on solving this you will get a quadratic equation which has a +ve and a -ve root. The +ve root gives the answer. note: here R(e)*r/R(e)+r gives the effective resistance of the resistors in parallel as mentioned above.

## What is the equivalent resistance between A and B in the given infinite ladder?

The equivalent resistance between A and B is RAB and between A and C is RAC.

## How mechanics is used in friction?

Friction depends upon the nature of the surface of contact. Friction acts parallel to the surface of contact. The direction of this frictional force on any one of the surfaces of contact will be opposite to the direction in which the contact surface tends to move. In other words, friction opposes motion.

## What’s the first step in solving a mechanics problem involving dry friction?

Steps for solving equilibrium problems involving dry friction: 1. Draw the necessary free body diagrams. Make sure that you show the friction force in the correct direction (it always opposes the motion or impending motion).

## What is friction in physics PDF?

Friction is a retarding force always acting opposite to the motion or tendency to move. Whenever a tendency exists for one contacting surface to slide along another surface the friction forces developed are always in a direction to oppose this tendency.

## What is triangular law force?

Triangle law of vector addition states that when two vectors are represented as two sides of the triangle with the order of magnitude and direction, then the third side of the triangle represents the magnitude and direction of the resultant vector.

## What are the different types of friction?

There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Friction and normal force are directly proportional to the contacting surfaces, and it doesn’t depend on the hardness of the contacting surface.

## What is the coefficient of friction formula?

The coefficient of friction (fr) is a number that is the ratio of the resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together. It is represented by the equation: fr = Fr/N.