Explain the value or importance of International system of units when describing motion
Not just motion ....
https://www.zmescience.com/other/map-of-countries-officially-not-using-the-metric-system/
The most obvious item is weight and mass
In English units we tend to sort of confusingly express mass in pounds, which is a unit of force, but only useful on earth.
Therefore to calculate the acceleration we need to somehow use weight / g.
for mass sometimes we use pounds/32 = weight force in pounds/g = slugs
Then you can get pounds force to accelerate along a line= m a where m is in slugs and a is in ft/s^2
However that is all pretty awkward compared to using mass in kilograms and distance in meters. F in Newtons = mass in kilograms * acceleration in m/s^2
if you want weight force on earth then it is simply m g where m is kilograms and g is about 9.81 m/s^2 on earth
The nautical mile is an exception. It is useful because it represents a minute of arc ( one degree/60 ) around a great circle on earth. This is easier to use for navigation with a sextant than meters.
The International System of Units (SI) is crucial when describing motion because it provides a standardized and consistent way to measure and communicate measurements across different countries and scientific disciplines. The SI unit for measuring motion is the meter (m) for distance or displacement, the second (s) for time, and the meter per second (m/s) for velocity or speed.
Here is how you can calculate motion using the SI units:
1. Distance: Measure the length of the path traveled by an object in meters (m). Use a ruler, tape measure, or any other appropriate measuring device.
2. Time: Measure the duration of the motion in seconds (s). Use a stopwatch, timer, or any other accurate timing device.
3. Speed: Divide the distance traveled by the time taken. The formula for speed is: Speed = Distance / Time. The unit for speed is usually in meters per second (m/s).
4. Velocity: Velocity is similar to speed, but it takes into account the direction of motion. For example, if an object is moving to the right, it has positive velocity, while moving to the left gives a negative velocity. Velocity is calculated using the formula: Velocity = Displacement / Time, where displacement is the change in position of the object.
Using the SI units for distance, time, speed, and velocity allows scientists, engineers, and researchers worldwide to communicate accurately and effectively about motion-related phenomena. It ensures that measurements are consistent and comparable, leading to reliable scientific research and technological advancements. Additionally, the SI system simplifies calculations and conversions, as most scientific formulas are based on these standardized units.