Changes

:<math>Speed = {\frac{distance}{time}} </math>:<math>s = \frac{D}{t} </math> 

distance = 300[[m]]300m

time = 120[[s]]120s

distance = 500[[m]]500m

time = 10[[s]]10s

| style="height:20px; width:300px; text-align:center;" |'''A [[horse]] takes 20 [[minute]]s to trot 2.4 [[kilometre]]s. Calculate the speed of the [[horse]] in [[Metres per second|metres per second]].'''| style="height:20px; width:300px; text-align:center;" |'''The International Space Station takes 92 90 [[minute]]s to orbit the Earth once travelling 4240,000 [[kilometre]]s. Calculate the speed of the ISS.'''

distance = 2.4[[km]] 4km = 2400[[m]]2400m

time = 20[[min]] = 1200[[s]]1200s

distance = 4240,000[[km]] 000km = 4240,000,000[[m]]000m

time = 2090[[min]] = 5400[[s]]5400s

<math>Speed = {\frac{4200000040000000}{5400}} </math>

<math>Speed = 76087407.7m407m/s </math>|}

<math>==Key Stage 4=====Meaning===[[Speed \approx 7600m]] is a [[scalar]] quantity which describes the rate at which an [[object]] changes position. ===About Speed===: [[Speed]] is a [[scalar]] because it has only [[magnitude]] but no direction.: The [[SI Unit]]s of [[speed]] are [[Metres per Second]].: [[Speed]] is commonly measured in the [[unit]]s of [[Miles per Hour]], but this is not a scientific [[unit]].: Other [[unit]]s of [[speed]] can be given by the [[unit]]s of [[distance]] used and the [[unit]]s of [[time]] used in the calculation of [[speed]]. If [[centimetre]]s and [[minute]]s are used then the [[unit]]s of [[speed]] would be centimetres per minute.: [[Speed]] can be found by [[measuring]] the [[distance]] travelled by an [[object]] in a given [[time]]. ===Typical Speeds===You should remember the following [[speed]]s for everyday events:{| class="wikitable"|-| style="height:20px; width:200px; text-align:center;" |'''Motion'''| style="height:20px; width:200px; text-align:center;" |'''Speed in m/s'''|-| style="height:20px; width:200px; text-align:center;" |Average Walking Speed| style="height:20px; width:200px; text-align:center;" |1.5m/s <|-| style="height:20px; width:200px; text-align:center;" |Average Running Speed| style="height:20px; width:200px; text-align:center;" |5m/math>s|-| style="height:20px; width:200px; text-align:center;" |Average Cycling Speed| style="height:20px; width:200px; text-align:center;" |10m/s|-| style="height:20px; width:200px; text-align:center;" |Car on the Motorway| style="height:20px; width:200px; text-align:center;" |30m/s|-| style="height:20px; width:200px; text-align:center;" |Propeller Plane Flying| style="height:20px; width:200px; text-align:center;" |100m/s|-| style="height:20px; width:200px; text-align:center;" |Jet Plane Flying| style="height:20px; width:200px; text-align:center;" |250m/s|-| style="height:20px; width:200px; text-align:center;" |Speed of Sound in Air| style="height:20px; width:200px; text-align:center;" |340m/s|-| style="height:20px; width:200px; text-align:center;" |Speed of Light in a Vacuum| style="height:20px; width:200px; text-align:center;" |300,000,000m/s