Difference between revisions of "Speed=Distance/Time"
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===About Speed=Distance/Time=== | ===About Speed=Distance/Time=== | ||
| − | : The standard scientific [[unit]]s for [[measuring]] '''speed''' are [[Metres per | + | : The standard scientific [[unit]]s for [[measuring]] '''speed''' are [[Metres per Second|metres per second]] (m/s). |
: The [[unit]]s of [[speed]] are given by the [[unit]]s of [[distance]] used and the [[unit]]s of [[time]] used in the calculation. | : The [[unit]]s of [[speed]] are given by the [[unit]]s of [[distance]] used and the [[unit]]s of [[time]] used in the calculation. | ||
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| style="height:20px; width:300px; text-align:left;" | | | style="height:20px; width:300px; text-align:left;" | | ||
| − | distance = | + | distance = 300m |
| − | time = | + | time = 120s |
<math>Speed = {\tfrac{distance}{time}} </math> | <math>Speed = {\tfrac{distance}{time}} </math> | ||
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<math>Speed = 2.5m/s </math> | <math>Speed = 2.5m/s </math> | ||
| style="height:20px; width:300px; text-align:left;" | | | style="height:20px; width:300px; text-align:left;" | | ||
| − | distance = | + | distance = 500m |
| − | time = | + | time = 10s |
<math>Speed = {\tfrac{distance}{time}} </math> | <math>Speed = {\tfrac{distance}{time}} </math> | ||
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| style="height:20px; width:300px; text-align:left;" | | | style="height:20px; width:300px; text-align:left;" | | ||
| − | distance = 2.4[[km]] = | + | distance = 2.4[[km]] = 2400m |
| − | time = 20[[min]] = | + | time = 20[[min]] = 1200s |
<math>Speed = {\tfrac{distance}{time}} </math> | <math>Speed = {\tfrac{distance}{time}} </math> | ||
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<math>Speed = 2m/s </math> | <math>Speed = 2m/s </math> | ||
| style="height:20px; width:300px; text-align:left;" | | | style="height:20px; width:300px; text-align:left;" | | ||
| − | distance = 42,000[[km]] = 42,000, | + | distance = 42,000[[km]] = 42,000,000m |
| − | time = 20[[min]] = | + | time = 20[[min]] = 5400s |
<math>Speed = {\tfrac{distance}{time}} </math> | <math>Speed = {\tfrac{distance}{time}} </math> | ||
Revision as of 11:13, 6 April 2019
Key Stage 3
Meaning
\[Speed = {\frac{distance}{time}} \] is an equation which can be used to calculate the speed of an object given the distance traveled and the time taken to travel that distance.
About Speed=Distance/Time
- The standard scientific units for measuring speed are metres per second (m/s).
- The units of speed are given by the units of distance used and the units of time used in the calculation.
\[Speed = {\frac{distance}{time}} \]
\[Speed = {\frac{metres}{seconds}} \]
\[Speed = {\frac{m}{s}} \]
\[Speed = m/s \]
Example Calculations
| A person jogs 300 metres in 120 seconds. Calculate the speed of the jogger. | A racing car travels 500 metres in 10 seconds. Calculate the speed of the racing car. |
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distance = 300m time = 120s \(Speed = {\tfrac{distance}{time}} \) \(Speed = {\tfrac{300}{120}} \) \(Speed = 2.5m/s \) |
distance = 500m time = 10s \(Speed = {\tfrac{distance}{time}} \) \(Speed = {\tfrac{500}{10}} \) \(Speed = 50m/s \) |
| A horse takes 20 minutes to trot 2.4 kilometres. Calculate the speed of the horse in metres per second. | The International Space Station takes 92 minutes to orbit the Earth once travelling 42,000 kilometres. Calculate the speed of the ISS. |
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distance = 2.4km = 2400m time = 20min = 1200s \(Speed = {\tfrac{distance}{time}} \) \(Speed = {\tfrac{2400}{1200}} \) \(Speed = 2m/s \) |
distance = 42,000km = 42,000,000m time = 20min = 5400s \(Speed = {\tfrac{distance}{time}} \) \(Speed = {\tfrac{42000000}{5400}} \) \(Speed = 7608.7m/s \) \(Speed \approx 7600m/s \) |