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Isaac Newton was an English Scientist In 1667, he developed 3 laws of motion that described movement of objects in terms of forces These laws of motion still hold true today What is a Force? FORCE = Any push or pull which causes something to move OR change its speed or direction What is a Force? Forces can be BALANCED or UNBALANCED Balanced forces are equal in size and opposite in direction Unbalanced forces are not equal in size and/or opposite in direction. OR If the forces on an object are UNBALANCED, we say a NET force results. What is Friction? Friction = A force that opposes or slows down motion Caused by the physical contact between moving surfaces The amount of friction depends upon the kinds of surfaces and the force pressing the surfaces together Friction changes motion into heat First Law: An object at rest stays at rest or an object in motion, stays in motion (in the same direction/at the same speed) unless acted upon by an unbalanced force Also called the law of inertia Inertia The tendency of an object to resist any change in its motion The greater the mass the greater the inertia The greater the speed the greater the inertia Examples of Newton’s 1st Law a) car suddenly stops and you strain against the seat belt b) when riding a horse, the horse suddenly stops and you fly over its head c) the magician pulls the tablecloth out from under a table full of dishes d) the difficulty of pushing a dead car VIDEO Newton’s First Law Person pushes wheelbarrow at constant velocity . No net force acts on rake. Rake continues moving forward. Wheelbarrow strikes rock. Rock exerts a net force on wheelbarrow causing it to decelerate. feet Discussion Questions 1. What are the differences in how balanced and unbalanced forces affect motion? 2. What is inertia? How is it involved in Newton’s 1st Law of Motion? 3. Two children who are fighting over a toy pull on it from opposite sides. The result is a standoff. Explain this in terms of the net force. Circles are linked to open slides to use Interwrite pad for student responses. Teacher may write student responses or let students write responses and explain. End 1. Balanced/Unbalanced 2. Interia 3. Net Force Tricky Tricks Lab Procedure 1. Fill a beaker with water. 2. Cover the beaker with an index card 3. Place a penny in the center of the card 4. Hold the base of the cup with it resting on the table 5. Use your index finger to flick the card. Discussion QUESTIONS to be written in you Science Journal. Write title and questions with answers. 1. How does this activity relate to the “pull the tablecloth” trick used by magicians? 2. Explain your observations using the vocabulary word inertia? Football in Motion Football at Rest Skateboard in motion Skateboard at rest Mass/Force Small Mass/Force Large Equal/ Opposite Small Equal/ Opposite Large The End Click on the hyperlinks to view the videos. Multimedia Project : Newton's Laws of Motion Video Rubric Teacher Name: Mrs. Holmes Student Name: ________________________________________ CATEGORY Content Presentation 4 3 Covers topic in-depth Includes essential with details and knowledge about the examples for each Law. topic. Subject knowledge Subject knowledge is appears to be good. excellent. Well-rehearsed with Rehearsed with fairly smooth delivery that smooth delivery that holds audience attention. holds audience attention most of the time. 2 1 Includes essential information about the topic but there are 1-2 factual errors. Content is minimal OR there are several factual errors. Delivery not smooth, but Delivery not smooth and able to maintain interest audience attention often of the audience most of lost. the time. Organization Content is well organized Uses transitions to Content is logically using transitions to group organize, but the overall organized for the most related material. organization of topics part. appears flawed. Requirements All requirements are met All requirements are met. One requirement was not More than one and exceeded. Each Law completely met. requirement was not has question and completely met. description of the Law. Workload The workload is divided The workload is divided The workload was and shared equally by all and shared fairly by all divided, but one person team members. team members, though in the group is viewed as workloads may vary from not doing his/her fair person to person. share of the work. Technology Student selected appropriate technology and checked it prior to presentation. Everything worked well. Student selected appropriate technology but, presentation did not work completely. There was no clear or logical organizational structure, just lots of facts. The workload was not divided OR several people in the group are viewed as not doing their fair share of the work. Student selected Student must redo appropriate technology project because it did not but, presentation did not work at all. work . Date Created: Jun 05, 2009 11:36 am (CDT) This is the Rubric that will be used for students to create your own Video Project. Sources: www.brainpop.com www.rubistar.com http://www.youtube.com/watch?v=F_yyCS49D6k http://www.youtube.com/watch?v=4LfJ081mLEk&NR=1 http://www.youtube.com/watch?v=T9KPwNeCdSg&NR=1 http://www.youtube.com/watch?v=V6sXTsB_oS4&NR=1