Draft:Punch(physics)

Punch is a physical quantity created by Tomáš Trešl, Lukáš Jedlička, and Jan Mikulica. Uder is denoted in the units of Trešl (hereafter Tr). Conversions:

Megatrešl: 1,000,000 Kilotrešl: 1,000 Hektotrešl: 100 Dekatrešl: 10 Trešl (base unit) Decitrešl: 0.1 Centitrešl: 0.01 Militrešl: 0.001 Uder (hereafter U) can be calculated by multiplying force, density, and distance, divided by a material constant.

For example, we want to calculate how many Trešls would be needed to break a wall made of wet oak wood with dimensions 2x2x0.5 m. We know that the force exerted is 500 N and the stroke distance is 1 m. We estimate the constant for wet oak wood (this value will depend on experimental data, but for now, we estimate it to be approximately 5000). The density of our material is 700 kg/m³. We will use the formula we defined earlier: U = F × ρ × S / K.

Calculating this example, we find that one uder represents a value of 70 Tr. Now, we will calculate how many uders would be needed for the entire wall. We know that the wall has an area of 4 m², and the calculated uder is for breaking 1 m². Therefore, U = 70 Tr × 4 = 280 Tr. Thus, it would take approximately 280 Tr to break the wall made of wet oak.

Punch was invented by Tomáš Trešl based on the physical quantity of work defined by James Prescott Joule. Lukáš Jedlička and Jan Mikulica helped define the quantity and give it its final form.