What does friction mean?
Choose 1 answer
{"type":"multi-choice","id":"7174","dataJson":{"type":"multi-choice","slide_id":42460,"key":7174,"prompt":"\u003cp\u003eWhat does friction mean?\u003c/p\u003e","validResponse":[7744],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"a weight hung from a fixed point so that it can swing freely. Used in clocks to help the mechanism keep time","value":7741,"fileboyId":"140c9f17-5880-4e06-8c0b-fcc2da753c80"},{"label":"A force between 2 surface that are in contact and trying to move over each other","value":7744,"fileboyId":"a1afd2f5-bc7c-40ce-a997-9f5c6b4557fe"},{"label":"a substance applied between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear","value":7745,"fileboyId":"c3106f7f-475d-4335-855f-a16bd92ce919"},{"label":"a term that is often used to describe ways in which energy is wasted","value":7742,"fileboyId":"576b29e2-f644-4ac2-9083-2593b82b59f5"},{"label":"move or cause to move back and forth or from side to side while suspended or on an axis","value":7743,"fileboyId":"93a43865-262a-4083-b16d-177aace868f2"}],"question_data":{"body":"Friction causes energy to be transferred to thermal energy. The fixed point and the air around the pendulum gradually get warmer. The thermal energy is less useful and scientists say it has been wasted or dissipated.","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/32511436-0e58-4515-85e6-38afc149586a?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What does dissipate mean?
Choose 1 answer
{"type":"multi-choice","id":"7172","dataJson":{"type":"multi-choice","slide_id":42451,"key":7172,"prompt":"\u003cp\u003eWhat does dissipate mean?\u003c/p\u003e","validResponse":[7742],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"a substance applied between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear","value":7745,"fileboyId":"c3106f7f-475d-4335-855f-a16bd92ce919"},{"label":"A force between 2 surface that are in contact and trying to move over each other","value":7744,"fileboyId":"a1afd2f5-bc7c-40ce-a997-9f5c6b4557fe"},{"label":"a term that is often used to describe ways in which energy is wasted","value":7742,"fileboyId":"576b29e2-f644-4ac2-9083-2593b82b59f5"},{"label":"move or cause to move back and forth or from side to side while suspended or on an axis","value":7743,"fileboyId":"93a43865-262a-4083-b16d-177aace868f2"},{"label":"a weight hung from a fixed point so that it can swing freely. Used in clocks to help the mechanism keep time","value":7741,"fileboyId":"140c9f17-5880-4e06-8c0b-fcc2da753c80"}],"question_data":{"body":"After this lesson, you should be able to: describe what's meant by the conservation of energy and describe how energy can be transferred within a system; you should also be able to describe what happens when energy is dissipated.","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/a3dd6a96-5553-400b-b09b-d58ede39ef4a?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What does swing mean?
Choose 1 answer
{"type":"multi-choice","id":"7173","dataJson":{"type":"multi-choice","slide_id":42457,"key":7173,"prompt":"\u003cp\u003eWhat does swing mean?\u003c/p\u003e","validResponse":[7743],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"A force between 2 surface that are in contact and trying to move over each other","value":7744,"fileboyId":"a1afd2f5-bc7c-40ce-a997-9f5c6b4557fe"},{"label":"a term that is often used to describe ways in which energy is wasted","value":7742,"fileboyId":"576b29e2-f644-4ac2-9083-2593b82b59f5"},{"label":"move or cause to move back and forth or from side to side while suspended or on an axis","value":7743,"fileboyId":"93a43865-262a-4083-b16d-177aace868f2"},{"label":"a substance applied between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear","value":7745,"fileboyId":"c3106f7f-475d-4335-855f-a16bd92ce919"},{"label":"a weight hung from a fixed point so that it can swing freely. Used in clocks to help the mechanism keep time","value":7741,"fileboyId":"140c9f17-5880-4e06-8c0b-fcc2da753c80"}],"question_data":{"body":"At the top of a swing, the mass has the maximum store of gravitational potential energy. As the pendulum swings downwards, this is gravitational potential energy is transferred into kinetic energy. The mass has the maximum amount of kinetic energy at the bottom of the swing where it is moving with the greatest speed. ","video":{"type":"fileboy","url":"243db59e-b935-4754-9a47-236842ee3bf9"},"image_url":"https://www.developingexperts.com/file-cdn/images/get/ac05531f-7d97-45c4-9d62-3a95c6b735d8?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What is a pendulum?
Choose 1 answer
{"type":"multi-choice","id":"7171","dataJson":{"type":"multi-choice","slide_id":42447,"key":7171,"prompt":"\u003cp\u003eWhat is a pendulum?\u003c/p\u003e","validResponse":[7741],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"A force between 2 surface that are in contact and trying to move over each other","value":7744,"fileboyId":"a1afd2f5-bc7c-40ce-a997-9f5c6b4557fe"},{"label":"a substance applied between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear","value":7745,"fileboyId":"c3106f7f-475d-4335-855f-a16bd92ce919"},{"label":"a weight hung from a fixed point so that it can swing freely. Used in clocks to help the mechanism keep time","value":7741,"fileboyId":"140c9f17-5880-4e06-8c0b-fcc2da753c80"},{"label":"a term that is often used to describe ways in which energy is wasted","value":7742,"fileboyId":"576b29e2-f644-4ac2-9083-2593b82b59f5"},{"label":"move or cause to move back and forth or from side to side while suspended or on an axis","value":7743,"fileboyId":"93a43865-262a-4083-b16d-177aace868f2"}],"question_data":{"body":"Describe the energy graph from the position and speed of the pendulum.","video":null,"image_url":"https://www.developingexperts.com/file-cdn/images/get/8594228f-35c5-4f2a-9b62-8d39304a686c?transform=resize:800x600;format:webp;quality:80"},"limitChoices":{"min":1,"max":1}}}
What is a lubricant?
Choose 1 answer
{"type":"multi-choice","id":"7175","dataJson":{"type":"multi-choice","slide_id":44484,"key":7175,"prompt":"\u003cp\u003eWhat is a lubricant?\u003c/p\u003e","validResponse":[7745],"use_data":false,"question_body":"","question_video_url":"","question_fileboy_image_id":"","options":[{"label":"a term that is often used to describe ways in which energy is wasted","value":7742,"fileboyId":"576b29e2-f644-4ac2-9083-2593b82b59f5"},{"label":"a weight hung from a fixed point so that it can swing freely. Used in clocks to help the mechanism keep time","value":7741,"fileboyId":"140c9f17-5880-4e06-8c0b-fcc2da753c80"},{"label":"a substance applied between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear","value":7745,"fileboyId":"c3106f7f-475d-4335-855f-a16bd92ce919"},{"label":"A force between 2 surface that are in contact and trying to move over each other","value":7744,"fileboyId":"a1afd2f5-bc7c-40ce-a997-9f5c6b4557fe"},{"label":"move or cause to move back and forth or from side to side while suspended or on an axis","value":7743,"fileboyId":"93a43865-262a-4083-b16d-177aace868f2"}],"question_data":{"body":"Over time, this causes the pendulum to lose energy and eventually stop swinging. We can reduce unwanted energy transfers by reducing friction. In the case of the pendulum, we could do that by using a lubricant such as oil on the fixed point, or by removing the air particles from around the pendulum. ","video":{"type":"fileboy","url":"243db59e-b935-4754-9a47-236842ee3bf9"},"image_url":null},"limitChoices":{"min":1,"max":1}}}
Look at the slide below to work out the answer.