These laws of motion still hold true today Isaac Newton was an English Scientist In 1667, he developed 3 laws of motion that described movement of objects in terms of forces

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. If the forces on an object are UNBALANCED, we say a NET force results. What is a Force? OR

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 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. feet Wheelbarrow strikes rock. Rock exerts a net force on wheelbarrow causing it to decelerate. No net force acts on rake. Rake continues moving forward.

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 Motion Football at Rest Rest Skateboard in motionmotion Mass/Force Large Large Mass/Force Small Small Skateboard at restrest Equal/ Opposite Small Small Equal/ Opposite Large 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: ________________________________________ CATEGORY4321 ContentCovers topic in-depth with details and examples for each Law. Subject knowledge is excellent. Includes essential knowledge about the topic. Subject knowledge appears to be good. Includes essential information about the topic but there are 1-2 factual errors. Content is minimal OR there are several factual errors. PresentationWell-rehearsed with smooth delivery that holds audience attention. Rehearsed with fairly smooth delivery that holds audience attention most of the time. Delivery not smooth, but able to maintain interest of the audience most of the time. Delivery not smooth and audience attention often lost. OrganizationContent is well organized using transitions to group related material. Uses transitions to organize, but the overall organization of topics appears flawed. Content is logically organized for the most part. There was no clear or logical organizational structure, just lots of facts. RequirementsAll requirements are met and exceeded. Each Law has question and description of the Law. All requirements are met.One requirement was not completely met. More than one requirement was not completely met. WorkloadThe workload is divided and shared equally by all team members. The workload is divided and shared fairly by all team members, though workloads may vary from person to person. The workload was divided, but one person in the group is viewed as not doing his/her fair share of the work. The workload was not divided OR several people in the group are viewed as not doing their fair share of the work. TechnologyStudent selected appropriate technology and checked it prior to presentation. Everything worked well. Student selected appropriate technology but, presentation did not work completely. Student selected appropriate technology but, presentation did not work. Student must redo project because it did not work at all. Date Created: Jun 05, :36 am (CDT) This is the Rubric that will be used for students to create your own Video Project.

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