How do you find how fast an object is moving? Measured as distance travelled per unit of time, metric speed is the speed in meters per second (m/s). Thus, the SI derived unit for speed is meter per second. That said, a metric speed is described as the rate at which an object is moving (covering a specific distance). It is referred to as a scalar quantity as it only describes the magnitude and not direction. Do not confuse speed with velocity.
Speed = Distance traveled / Time taken
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Velocity is described as the rate of change of an object’s position in reference to a frame of time. Velocity falls under the category of a vector quantity as it defines both the magnitude as well as direction. The international system of unit (SI) derived unit for velocity is also meter per second (m/s) alike speed.
Velocity= Change in position / Change in time
Acceleration too falls under the classification of a vector quantity as it is described as the rate of change of velocity with reference to change in time.
The SI derived unit for acceleration is meter per square seconds (m/s2).
Speed in meters per second (m/s)
If an object is travelling at a speed of 1 m/s, it moves 1 meter every second.
1 m/s is like a very normal walking speed.
One hour of gentle walking at 1 m/s moves you about 3.6 km.
If an object is travelling at a metric speed of 2 km/h, it moves 2 kilometres every hour.
It is quite a slow walking speed. A kilometre per hour (km/h) is often used to express speed for a car.
Example: Highway speed of a car is around 150 km/h
One hour at this speed moves you 150 km.
In this section, you will learn how to perform metric speed conversion using various formulae for the conversion. These formulae for the conversion consider values between different unit representations for speed/velocity.
Usually, the technique used to arrive at the formula is dependent upon the individual units inserted in the numerator and the denominator.
M/s = ÷1,000km / ÷ 3,600 hour
M/s → × 3.6 → km/h
Km/hr = × 1000km / × 3600 hour
km/hr → × 0.28 → m/s
Km/s = × 0.62137 mi / × 3600 hour
Km/s → × 2236.9 → mi/hr
Ft/s = × .3048 m/ × 1 s
Ft/s → × .3048 → m/s
Mi/hr = × 1609.34 m / × 3600 hour
Mi/hr → × 0.447→ m/s
m/s = × 3.28084 ft / × 1 s
m/s → × 3.28→ ft/s
km/s = ÷1000m / × 1 s
km/s → × 1000→ m/s
ft/min = ×.3048m / × 60s
ft/min → ×.00508→ m/s
mi/hr = × 5280ft / × 3600s
mi/hr → ×1.47→ ft/s
cm/s = ÷100m / × 1s
cm/s → ÷100m → m/s
Rotation/min = × 2 Π× 2 r m / × 60 s
rpm → × 2 (Π× r/30) → m/s
r = radius
2 × π × r = Linear Velocity
Radian/sec = × r m / × 1 s
rad/s → × r → m/s
Mach refers to the ratio of the speed of a moving object through a fluid to the speed of sound via the same medium. because it is a ratio, it does not contain any dimension. The speed of the sound does not remain constant. It differs depending upon the temperature and atmospheric pressure.
m/s → × .0029104→ Mach
Example: Convert a speed of a moving object 70 meters per second to kilometer per hour
Solution: For metric speed conversion of m/s to km/hr, we need to multiply it by 3.6
Thus, 70 m/s = 70 × 3.6 = 252 km/hr
Example: Convert a speed of of a car 20 feet per second (ft/s) to meters per second (m/s)
Converting value from ft/s to m/s, we would require multiplying it by 0.3048
Thus, 20 ft/s = 20 × 0.3048 = 6.096 m/s
Conclusion: Metric speed helped you learn about the Speed,Time, Velocity and Acceleration, their definitions, units and the metric conversion, rules/formulae between different units. Thus, this may serve as a quick guide for any of the aforementioned concepts.
Q1. What is the Difference Between Speed and Velocity in Metric Measure?
Answer: In metric measure, both speed and velocity are the ratios of the distance travelled by an object with respect to the time taken for the movement. However, speed is a type of scalar quantity. It takes into account only the magnitude regardless of the direction.
On the other hand, velocity is a vector quantity and it exhibits both magnitude and direction.
Similarly, speed and acceleration are also not the same things. Acceleration is the rate of change in speed. It represents the change of speed in reference to the time.
Q2. How Many Weeks are there in 6 Months?
Answer: In order to calculate the number of weeks in a half year (6months), lets firs calculate the following:
Number of days in a year (12 months) = 365 (366 once every 4 years due to leap year)
Number of days in a half year (6 months) = 365/2 = 182.5
Number of days in a week = 7
Thus, the number of weeks in 6 months = 182.5/7
= 26.07 (about 26 weeks)
Q3. What is Meant by the SI Unit?
Answer: In the modern form of the Metric system, SI is the International system of units. The units listed in this system are widely used as the standard units of measurements in almost every country around the world.