# How to find the mass , knowing the speed ?

You will need:
• weight value
• The speed
• Meaning force
• Time
# 1

Besides school lessons of physics, such problems can easily come in handy in life.For example, it is necessary to accurately calculate the mass of the goods without the use of scales in stock, or to accurately calculate the time for which the goods will be moved and the speed with which this action will be made.To solve this kind of problem can only be via the use of Newton's second law.It is a basic law of dynamics allows us to learn how to find the mass, knowing the speed.Newton's second law states that the force is equal to the product of mass and acceleration, where the force is measured in Newtons, mass in kilograms, and the acceleration - in meters per second squared.

# 2

Naturally, in order to find the unknown factor is divided by the known factor.In this case, the mass will be equal to the quotient of the force by the acceleration.The left side of the equation is fairly simple to calculate, because everything w

ill guess how to calculate the mass of a substance with weights.Next we need to replace the unknown quantity in any ratio with known quantities.We can easily replace the acceleration quotient of speed on time, because we know the speed of originally, and we can easily detect with the help of second hand watches.

# 3

If the object is hollow, it makes sense to learn how to determine the mass of air inside it, because at times it can slightly change the final calculations.It is worth remembering that if you or the time counted in minutes, or set speed in kilometers per hour, all this needs to be translated into the standard international SI system of measurement, in which time is measured in seconds, the speed in meters per second, and the mass, as a physical quantityIt measured in kilograms.Because m = F / a and a = V / t in the case of substitution in the first second formula it follows that m = F / V / t, and therefore we can get m = Ft / V, due to the division rule fraction.

# 4

Next to find the mass of the object you just need to substitute the pre-translated into a common system of values ​​of strength, time and speed, and to solve this equation for m.Weights extremely small objects are calculated quite differently.For example, if you want to learn how to find the mass of the nucleus of an atom of any substance, you should seek values ​​to the periodic table.But for all objects larger than atoms and molecules, the method acts described above, which is as far back as the seventeenth century discovered the great physicist Isaac Newton.