What does the 『G』 in the impact indicator specification mean?
A “G” always leaves behind the shock watch indicator. Some customers view “G” as gram, but in fact, the “G” is so-called acceleration. But what does the “G” exactly mean on the shock watch indicator? Let us take you to see around.
What Is G-Force?
The “G” in G-Force is the abbr. for “gravity”, which is the acceleration of gravity on earth and presents as
Formula:
g=9.8 m/s²
In fact, whether it is a car or a roller coaster when it comes to G-force, it’s all about the acceleration of cars. However, people frequently compare the volume of acceleration with the acceleration of gravity, and then there will be 1G, 2G, 3G and so.
For the relation between acceleration and force, we have to use the formula from Newton’s laws of motion, F=ma. “Force (F)” is equal to “Mass (m)” multiply by “Acceleration (a)”.
As acceleration is the same, the volume of force and mass of the object is proportional. All objects are subject to gravity on the earth, putting acceleration of gravity (g) into acceleration, the formula comes to F=mg which is the weight of the object.
“G” In G Force Indicator Sticker
Now, you have the concept. We can make a further discussion with the “G” in the g force indicator.
Let’s take 7ms(G): 50G for example. In general, the gravity acceleration of the shock force indicator will be accompanied by a time.
(1) 50G = 50*9.8 = 490 m/s^2 (acceleration)
(2) 490 m/s^2 (acceleration) * 7 ms (passed time)
(3) 490*0.007 = 3.43 m/s (convert to the speed at impact)
If a hard disk hits at a speed of 3.43m/s and then stops after 7ms, it will reach an acceleration of 50G.
If it hits an object at a speed of 3.43 m/s and bounces at the same speed (Newton’s law) and the elapsed time is also 7 ms, the acceleration of the hard disk is 100G.
Do you notice a simple principle? To put it simply, the g force indicator 50G means that it takes 50 times the acceleration g-force to activate the product and activate.
How Much Force Can Trigger Shock Watch Indicator?
Each g shock indicator has a corresponding “G”, which means that when the indicator is subjected to a shock acceleration that exceeds the G value number, the indicator will start to become red. The larger the number is, the greater the shock force is required.
For example, the least sensitive 100G needs to be subjected to an impact force of more than about 100G, and then activated. 100G will be activated about over 90 cm; while the most sensitive 25G needs to be subjected to an impact force of more than about 25G, which is about more than 30 cm will be activated.
Through the following YouTube video, you can understand the approximately required impact force of each impact indicator model (25G, 37G, 50G, 75G, 100G).