![]() ![]() Two cars are travelling towards each other on a road. \(Relative~speed = speed~of~object~1 speed~of~object~2\) Objects moving in opposite directions towards, or away from, each other To a passenger in the red car, the blue car appears to be travelling past at 5 m/s. The blue car is travelling at 25 m/s in front of the red car, which is travelling at 30 m/s. ![]() Two cars are travelling in the same direction on a road. \(Relative~speed = fastest~speed - slowest~speed\) The calculation for relative speed depends on whether the objects are moving in the same direction or the objects are moving in opposite directions towards, or away from, each other. This is because of their relative motion to each other. If you have travelled in a car on the motorway, you may have noticed that other cars passing by appear to move slowly past you, even though you know the actual speeds of the two cars are very high. In four minutes, you've travelled four hundred metres.Īll the way to ten minutes, you've travelled a thousand metres, the distance from home to school. In three minutes, you've travelled three hundred metres. So in two minutes, you've travelled two hundred metres. It means literally that in one minute, you've travelled one hundred metres. What does it mean to travel at one hundred metres per minute? Now, that makes sense, if you think about it, this definition of speed. Your speed is the distance divided by the time, one thousand divided by ten equals one hundred metres per minute, which is quite a fast walk or even a bit of a jog. You have to travel one thousand metres in ten minutes. ![]() In this case, that means one thousand metres, distance from home to school, divided by ten minutes, the time you've allowed yourself. What speed do you have to walk or run to get to school on time? Let's say that you're going to go from home to school, and school is one kilometre away from your house, that's a thousand metres.Īnd you've left yourself ten minutes to make that journey. Let's think now about the concept of motion and in particular, the idea of speed. ![]()
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