{"id":4167,"date":"2018-11-30T15:00:25","date_gmt":"2018-11-30T20:00:25","guid":{"rendered":"http:\/\/iblog.dearbornschools.org\/salehm\/?p=4167"},"modified":"2018-11-30T11:07:43","modified_gmt":"2018-11-30T16:07:43","slug":"todays-reinforcement-of-your-last-c-e-r-review-for-test","status":"publish","type":"post","link":"https:\/\/iblog.dearbornschools.org\/salehm\/2018\/11\/30\/todays-reinforcement-of-your-last-c-e-r-review-for-test\/","title":{"rendered":"Today’s Reinforcement of Your Last C.E.R.: Review for Test"},"content":{"rendered":"

Question 1:<\/b> How can a small object (<\/span>small mass<\/span>) have the same kinetic energy as a large object (<\/span>large mass<\/span>)?<\/span><\/p>\n

If two objects have a KE of 50 J, and one object has mass of 1 kg moving at 10 m\/s while the other has mass of 100 kg moving at 1 m\/s, then they both have the same K.E.<\/span><\/p>\n

KE= \u00bd m v\u00b2 \u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 KE= \u00bd m v\u00b2 <\/span><\/p>\n

50 J = \u00bd (<\/span>1 kg<\/b>) (10 m\/s)\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a050 J = \u00bd (<\/span>100 kg<\/b>) (1 m\/s)\u00b2<\/span><\/p>\n

50 J = \u00bd (1 kg) 100 m\u00b2\/s\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a050 J = \u00bd (100 kg) 1 m\u00b2\/s\u00b2<\/span><\/p>\n

50 J = 50 J\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 \u00a050 J = 50 J<\/span><\/p>\n

***Note that the smaller object tends to have a higher velocity.***<\/span><\/p>\n

***Note that the larger object tends to have a lower velocity.***<\/span><\/p>\n

 <\/p>\n

Question 2:<\/b> How can an object with a <\/span>small velocity <\/span>have the same kinetic energy as an object with a <\/span>large velocity<\/span>?<\/span><\/p>\n

If two objects have a KE of 50 J, and one object has mass of 1 kg moving at 10 m\/s while the other has mass of 100 kg moving at 1 m\/s, then they both have the same K.E.<\/span><\/p>\n

KE= \u00bd m v\u00b2 \u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 KE= \u00bd m v\u00b2 <\/span><\/p>\n

50 J = \u00bd (<\/span>100 kg<\/span>) (<\/span>1 m\/s<\/b>)\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a050 J = \u00bd (<\/span>1 kg<\/span>) (<\/span>10 m\/s<\/b>)\u00b2<\/span><\/p>\n

50 J = \u00bd (100 kg) 1 m\u00b2\/s\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a050 J = \u00bd (1 kg) 100 m\u00b2\/s\u00b2<\/span><\/p>\n

50 J = 50 J\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 \u00a050 J = 50 J<\/span><\/p>\n

 <\/p>\n

***Note that the larger object tends to have a lower velocity.***<\/span><\/p>\n

***Note that the smaller object tends to have a higher velocity.***<\/span><\/p>\n

 <\/p>\n

\f<\/span><\/p>\n

Question 3:<\/b> What happens to the kinetic energy if you double the mass?<\/span><\/p>\n

One ball has a mass of 5 kg and the other has as mass of 10 kg. They are both thrown at a speed of 20 m\/s. What is the difference in their KE?<\/span><\/p>\n

KE= \u00bd m v\u00b2 \u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0KE= \u00bd m v\u00b2 <\/span><\/p>\n

KE = \u00bd (<\/span>5 kg<\/span>) (<\/span>20 m\/s<\/b>)\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 KE = \u00bd<\/span> (10 kg)<\/span> (<\/span>20 m\/s<\/b>)\u00b2<\/span><\/p>\n

KE = \u00bd (5 kg) 400 m\u00b2\/s\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 KE = \u00bd (10 kg) 400 m\u00b2\/s\u00b2<\/span><\/p>\n

KE = 1,000 J\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 \u00a0KE = 2,000 J<\/span><\/p>\n

The KE of the more massive ball is <\/span>double<\/span> the the KE of the less massive ball.<\/span><\/p>\n

 <\/p>\n

Question 4:<\/b> What happens to the kinetic energy if you double the velocity?<\/span><\/p>\n

Two balls have a mass of 5 kg. One is thrown at 10 m\/s and the other is thrown at a speed of 20 m\/s. What is the difference in their KE?<\/span><\/p>\n

KE= \u00bd m v\u00b2 \u00a0<\/span> \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 \u00a0KE= \u00bd m v\u00b2 <\/span><\/p>\n

KE = \u00bd (<\/span>5 kg<\/b>)<\/b> (10 m\/s)\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0KE = \u00bd<\/span> (<\/span>5 kg<\/b>)<\/span> (20 m\/s)\u00b2<\/span><\/p>\n

KE = \u00bd (5 kg) 100 m\u00b2\/s\u00b2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0KE = \u00bd (5 kg) 400 m\u00b2\/s\u00b2<\/span><\/p>\n

KE = 250 J\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 \u00a0KE = 1,000 J<\/span><\/p>\n

 <\/p>\n

The KE of the faster moving ball is <\/span>4 times<\/span> the KE of the slower moving ball.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Question 1: How can a small object (small mass) have the same kinetic energy as a large object (large mass)? If two objects have a KE of 50 J, and one object has mass of 1 kg moving at 10 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":74,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4167","post","type-post","status-publish","format-standard","hentry","category-class-news"],"_links":{"self":[{"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/posts\/4167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/users\/74"}],"replies":[{"embeddable":true,"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/comments?post=4167"}],"version-history":[{"count":0,"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/posts\/4167\/revisions"}],"wp:attachment":[{"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/media?parent=4167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/categories?post=4167"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iblog.dearbornschools.org\/salehm\/wp-json\/wp\/v2\/tags?post=4167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}