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Oct 21, 2023 · distance = speed x time. Rate and speed are similar since they both represent some distance per unit time like miles per hour or kilometers per hour. If rate r is the same as speed s, r = s = d/t. You can use the equivalent formula d = rt which means distance equals rate times time. distance = rate x time. To solve for speed or rate use the ...
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It describes how quickly or slowly an object moves from one place to another. The standard (SI) unit of speed is meters per second (m/s), but it can also be expressed in other units, such as kilometers per hour (km/h), miles per hour (mph), or feet per second (ft/s), depending on the context or the country's measurement system.
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- Speed and Velocity
- Speed
- Units
- Average vs Instantaneous Speed
- Constant Speed
- Velocity
- Relative
Speed is how fast something moves. Velocity is speed with a direction. Saying Ariel the Dog runs at 9 km/h(kilometers per hour) is a speed. But saying he runs 9 km/h Westwardsis a velocity. Imagine something moving back and forth very fast: it has a high speed, but a low (or zero) velocity.
Speed is measured as distance moved over time. Speed = Distance Time We can also use these symbols: Speed = Δs Δt Where Δ ("Delta") means "change in", and 1. smeans distance ("s" for "space") 2. tmeans time
Speed is commonly measured in: 1. meters per second (m/s or m s-1), or 2. kilometers per hour (km/h or km h-1) A km is 1000 m, and there are 3600 seconds in an hour, so we can convert like this (see Unit Conversion Methodto learn more): So 1 m/s is equal to 3.6 km/h
The examples so far calculate average speed: how far something travels over a period of time. But speed can change as time goes by. A car can go faster and slower, maybe even stop at lights. So there is also instantaneous speed: the speed at an instantin time. We can try to measure it by using a very short span of time (the shorter the better).
When the speed does not change it is constant. For constant speed, the average and instantaneous speeds are the same.
Velocity is speed with a direction. It is actually a vector ... ... as it has magnitude anddirection Because the direction is important velocity uses displacementinstead of distance: Speed = Distance Time Velocity = Displacement Time in a direction. Learn more at Vectors.
Motion is relative. When we say something is "at rest" or "moving at 4 m/s" we forget to say "in relation to me" or "in relation to the ground", etc. Think about this: are you really standing still? You are on planet Earth which is spinning at 40,075 km per day (about 1675 km/h or 465 m/s), and moving around the Sun at about 100,000 km/h, which is ...
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