Isaac Newton was an English Scientist In 1667

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 l l Balanced forces are equal in size and opposite in direction Unbalanced forces are not equal in size and/or opposite in direction. OR l 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 l Caused by the physical contact between moving surfaces l The amount of friction depends upon the kinds of surfaces and the force pressing the surfaces together l Friction changes motion into heat

First Law: l 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 ü ü ü 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 1 st 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 1 st 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 3 2 1 Teacher Name: Mrs. Holmes Student Name: ____________________ CATEGORY Content Presentation 4 Covers topic in-depth Includes essential Content is minimal OR with details and knowledge about the information about there are several factual examples for each Law. topic. Subject knowledge topic but there are 1 -2 errors. Subject knowledge is appears to be good. factual errors. excellent. Well-rehearsed with Rehearsed with fairly Delivery not smooth, but Delivery not smooth and smooth delivery that able to maintain interest audience attention often holds audience attention of the audience most of lost. most of 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. There was no clear or logical organizational structure, just lots of facts. Requirements 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 was not and shared equally by all and shared fairly by all divided, but one person divided OR several team members, though in the group is viewed as people in the group are workloads may vary from not doing his/her fair viewed as not doing their person to person. share of the work. fair share of the work. Technology Student selected appropriate technology and checked it prior to presentation. Everything worked well. Student selected Student must redo appropriate technology project because it did not but, presentation did not work at all. work completely. 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_yy. CS 49 D 6 k http: //www. youtube. com/watch? v=4 Lf. J 081 m. LEk&NR=1 http: //www. youtube. com/watch? v=T 9 KPw. Ne. Cd. Sg&NR=1 http: //www. youtube. com/watch? v=V 6 s. XTs. B_o. S 4&NR=1