![\"\"](\"https:\/\/blogs.glowscotland.org.uk\/gc\/public\/hydnsecscis2revision\/uploads\/sites\/5105\/2014\/10\/Space-a.png\" "\\"Space")
<\/a><\/p>\nSpace Travel<\/strong><\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong><\/p>\n Newton<\/strong>\u2019s 3rd<\/sup> Law<\/strong><\/p>\n \u201cEvery action has an equal and opposite reaction\u201d<\/p>\n This law is used when dealing with the propulsion of rockets<\/strong> and spacecrafts:<\/p>\n The burning gas is forced backwards out of the rocket.\u00a0 At the same time the gas exerts a force on the rocket which is equal in size but opposite in direction.\u00a0 This force pushes the rocket forwards.<\/p>\n \u00a0<\/strong><\/p>\n Newton\u2019s 1st<\/sup> Law<\/strong><\/p>\n \u201cAn object will remain stationary or will travel at a constant velocity, provided there are no unbalanced forces acting.\u201d<\/p>\n A rocket in space will continue at a constant speed (even without boosters) since there is no air resistance or friction to slow it down.<\/p>\n Mass and Weight<\/strong><\/p>\n Mass is measured in kilograms (kg).\u00a0 It is a measure of the amount of matter making up an object.\u00a0 The mass of an object does not change<\/span>.<\/p>\n Weight is measured in Newtons (N).\u00a0 It is the force on an object exerted by gravity.\u00a0 Weight will change<\/span> depending on the gravitational field strength, g.<\/p>\n \u00a0\u00a0 \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n \u00a0<\/strong><\/p>\n Friction<\/strong><\/p>\n Friction is a force produced when two surfaces move over each other.<\/p>\n Friction is an opposing force.\u00a0 It acts against the motion of an object and will try to prevent an object moving.<\/p>\n Friction could be reduced here in a number of ways, e.g. using wheels or rollers.<\/p>\n In space travel, friction can be problematic during take-off.\u00a0 The rocket must be streamlined or aerodynamic to reduce friction due to air resistance.<\/p>\n On re-entry, friction between the rocket and the atmosphere causes the rocket to heat up.\u00a0 Heat shields are required to prevent the rocket from burning up.<\/p>\n On re-entry, friction is also helpful in slowing the rocket down.<\/p>\n Close to touch down, parachutes are used to increase air resistance (friction) and slow the rocket down further.<\/p>\n Life Elsewhere?<\/strong><\/p>\n For life to exist on earth two things are required:\u00a0<\/p>\n 1.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Liquid water<\/p>\n 2.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Oxygen rich atmosphere<\/p>\n Planets or moons that have liquid water may support life.<\/p>\n Planets outside our solar system are known as \u201cexoplanets\u201d.\u00a0 Many have now been discovered including some which may have liquid water.<\/p>\n","protected":false},"excerpt":{"rendered":" Definitions Space Travel \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Newton\u2019s 3rd Law \u201cEvery action has an equal and opposite reaction\u201d This law is used when dealing with the propulsion of rockets and spacecrafts: \u00a0 The burning gas is forced backwards out of the rocket.\u00a0 At the same time the gas exerts a force on the rocket which is equal in … Continue reading Journey to Space Summary<\/span> <\/a>\u00a0<\/p>\n<\/a><\/p>\n<\/a><\/p>\n