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How to calculate the spring force constant

vir:Natančnost Qianye čas:2023-5-19

Springs are widely used in various applications, including mechanical devices, tools, and machines. They are versatile and can easily be modified to suit different purposes. However, in order to make the most effective use of springs, it is essential to calculate their force constant accurately. In this article, we will discuss the methods for calculating the spring force constant and provide some practical examples to help you better understand the concepts.

The concept of spring force constant

The force constant of a spring is defined as the amount of force that is required to elongate or compress the spring by a unit distance. This unit of distance can be meters, inches, or any other unit of measurement, so long as it is constant throughout the calculation. In other words, the force constant represents the level of stiffness or resistance of a spring.

The force constant of a spring can be expressed by the following equation:

F = kx

where F is the force acting on the spring, k is the force constant of the spring, and x is the distance the spring is stretched or compressed from its relaxed position. The force constant is usually measured in units of newtons per meter (N/m) or pounds per inch (lb/in).

Method 1: Calculation of the force constant of a spring

In order to accurately calculate the force constant, you need to know the mass of the object that the spring is attached to, the displacement of the object from its relaxed position, and the force acting on the object. We will use a practical example to demonstrate how to apply this formula.

Example: A spring measures 30 cm in length and has a diameter of 1 cm. The spring exerts a force of 200 newtons at a point 20 cm from the relaxed position when a mass of 50 kg is hooked onto the spring. Calculate the force constant of the spring.


First, we need to convert the length of the spring into meters for easy computation. Therefore, the length of the spring is given by:

l = 30 cm = 0.3 m

Now we need to calculate the displacement of the object from its relaxed position. In this case, the displacement is given by:

x = 20 cm = 0.2 m

Using the force and mass of the object, we can calculate the force constant of the spring using the formula:

F = kx

Therefore, k = F/x

Substituting values:

k = 200 N / 0.2 m = 1000 N/m

Therefore, the force constant of the spring is 1000 N/m.

Method 2: Measurement of the spring force constant

In certain cases, it is not possible to calculate the force constant of a spring with accuracy using the above method due to lack of data such as the mass of the suspended object or the force acting on the spring. Therefore, an alternative method of measuring is needed to get an accurate measurement of the spring force constant.

Example: You have got a spring in the gym and want to measure its force constant.




Hang the spring vertically. Attach a weight of a known mass to the lower end of the spring to elongate it. Measure the length of the spring, both when relaxed and when under load. Be cautious to keep the weight perpendicular to the ground at all times. Finally, calculate force the sloping weight according to the slant itself observed

If weight or loading distribution issues interfere consistency with chosing proper lenght measurements, consider put series of carefully calculated weights from no weight through 5 stages * X – kgs after coordinate each next PARM to committed distance values attained

Using a force gauge to measure the force placed on the spring in Newton.

Now we divide the well-known Force or Demand By Elongation

k = (demand force ÷ forces sagged)

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