{"id":57,"date":"2014-11-11T09:50:31","date_gmt":"2014-11-11T09:50:31","guid":{"rendered":"http:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/?page_id=57"},"modified":"2014-11-11T10:17:11","modified_gmt":"2014-11-11T10:17:11","slug":"cosmology","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/cosmology\/","title":{"rendered":"Space Travel Summary (S3)"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Light year\u00a0<\/h1>\n

This is the distance<\/strong> that light can travel in one year.\u00a0 We use light years to describe distances in space physics because otherwise the numbers would be ridiculously large.<\/p>\n

\"\"<\/a><\/p>\n

\u00a0<\/p>\n

The following table give some information about the time taken for light to cover different distances (interest only \u2013 no need to learn values)<\/p>\n

\"\"<\/a><\/p>\n

Space 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 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 velocity (even without boosters) since there are no forces such as air resistance or friction to slow it down.<\/p>\n

\u00a0<\/p>\n

\"\"<\/a>\u00a0<\/p>\n

Newton\u2019s 3rd<\/sup> Law<\/strong><\/p>\n

\u201cEvery action has an equal and opposite reaction\u201d<\/p>\n

What this means is if A exerts a force on B, then B exerts an equal size of force backwards on A.<\/p>\n

This law is used when dealing with the propulsion of rockets<\/strong> and spacecrafts:<\/p>\n

\"\"<\/a><\/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

Forces acting on each other in this way are known as \u201cNewton Pairs\u201d.<\/p>\n

e.g. When a golf club exerts a force on the ball, the ball exerts an equal force back on the club.\u00a0 These forces are Newton Pairs.<\/p>\n","protected":false},"excerpt":{"rendered":"

Light year\u00a0 This is the distance that light can travel in one year.\u00a0 We use light years to describe distances in space physics because otherwise the numbers would be ridiculously large. \u00a0 The following table give some information about the time taken for light to cover different distances (interest only \u2013 no need to learn … Continue reading “Space Travel Summary (S3)”<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-57","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/pages\/57","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/comments?post=57"}],"version-history":[{"count":12,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/pages\/57\/revisions"}],"predecessor-version":[{"id":60,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/pages\/57\/revisions\/60"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysn5u1\/wp-json\/wp\/v2\/media?parent=57"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}