# Slider Crank Magnitude and Direction of Force on Member AB

• Alistair McCheyne
In summary, the conversation discusses the use of an acceleration diagram to determine the acceleration of different components and the trigonometric calculations needed to find the forces acting on a piston in a straight line motion. The diagram provides the acceleration values and the masses are also given, making it possible to calculate the forces acting on a specific component. The direction of the connecting rod also plays a role in determining the direction of these forces.
Alistair McCheyne

## The Attempt at a Solution

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The acceleration diagram gives you the acceleration of the various bits. You also have the masses. The rest is trig. For example, the piston is accelerating in a straight line. Because the connecting rod is at an angle to the direction of piston travel there is a force component perpendicular to the direction of piston travel and another along the direction of piston travel. Those forces act on A in the direction along the connecting rod.

## 1. What is a slider crank mechanism?

A slider crank mechanism is a mechanical linkage that converts rotary motion into reciprocating motion or vice versa. It consists of a slider, a crank, and a connecting rod.

## 2. What is the purpose of the slider crank mechanism?

The slider crank mechanism is commonly used in engines and machines to convert the linear motion of the piston into rotary motion and vice versa. It is also used in pumps, compressors, and other mechanical devices.

## 3. What is the magnitude of force on member AB in a slider crank mechanism?

The magnitude of force on member AB in a slider crank mechanism depends on the length of the crank, the angle of the crank, and the force applied at the slider. It can be calculated using the equations of statics and trigonometry.

## 4. How is the direction of force on member AB determined in a slider crank mechanism?

The direction of force on member AB in a slider crank mechanism is determined by the angle of the crank and the position of the slider. The force acts perpendicular to the connecting rod and is directed towards or away from the crank depending on the position of the slider.

## 5. Can the force on member AB be changed in a slider crank mechanism?

Yes, the force on member AB can be changed by adjusting the length of the crank, the angle of the crank, or the force applied at the slider. By changing these parameters, the magnitude and direction of force on member AB can be altered to suit the specific needs of the mechanism.

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