Force and Motion. 8 th Grade Science
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1 Force and Motion 8 th Grade Science
2 Today in Science: Explain that an unbalanced force acting on an object changes that object's speed and/or direction. Main Idea: How have our ideas changed since the Greeks started studying motion? Log Updates: 22. Log sheet #3 23. Inertia power point notes Homework: Reflection (above)
3 Vocabulary Updates Force a push or pull Friction a contact force that opposes motion and occurs when a moving object rubs against a surface Mass amount of matter that an object contains Inertia tendency of an object to remain at rest or in motion until acted upon by an external force
4 Describe how the change in the position (motion) of an object is always judged and described in comparison to a reference point Main Idea: When we describe the location of any object, it is necessary to refer to other objects in the same area. This is an example of a reference point.
5 Where is it? Describe the location of some object in the classroom. Write your description on a piece of paper. Give your description to another student (without the answer) After receiving a description from another student, try to find the object described on another student s paper write your answer at the bottom of the page
6 Describe how the change in the position (motion) of an object is always judged and described in comparison to a reference point. Main Topic: What is the difference between distance and displacement? Check understanding of reference points Washer Activity Discussion Vocabulary Words Homework: distance and displacement worksheet due tomorrow
7 Describe how the change in the position (motion) of an object is always judged and described in comparison to a reference point. Main Topic: Relative Motion and Frame of Reference Review homework Videos Discussion Read pp and answer??
8 Relative Motion
9 Reminder (Previous cycle): Distance and Displacement START FINISH Need to distinguish how long we traveled from how far away (and in what direction) we traveled.
10 Distance and displacement Distance and displacement are two quantities which may seem to mean the same thing, yet have distinctly different definitions and meanings. Distance refers to "how much ground an object has covered" during its motion. Displacement refers to "how far out of place an object is"; it is the object's change in position.
11 Vocabulary Position the description of where an object is in space Direction the line or path along which an object moves
12 Please add this word to your list!! Vocabulary Frame of reference (reference point) a stationary object against which motion is measured Motion the change in position of an object with respect to time Relative Motion the motion of one body relative to another.
13 Force and Motion -- Log Sheet Force and Motion Log Sheet Updates 1. October Class Notes 2. Vocabulary Page 3. Distance and Displacement Worksheet 4. The Traveling Washer Review Worksheet 6. Race Car Lab Worksheet 7. Practice Worksheet -- Speed
14 8. Calculating average speed 9. Graphing Distance VS Time 10. Motion Graphs 11.Reflection #2 12.Calculating speed, distance, and time
15 Explain that motion describes the change in the position of an object (characterized by a speed and direction) as time changes. Main Topic: Determining Speed Lab Reports Pop Quizzes Race Car Lab Discussion Homework: Complete the Practice Worksheet -- Speed
16 Explain that motion describes the change in the position of an object (characterized by a speed and direction) as time changes. Main Topic: Constant Speed, Average Speed, Instantaneous Speed Review data from yesterday make graphs on the floor Discuss speed and the unit of measure for speed Review worksheet from yesterday make corrections Practice worksheet for constant speed graph Vocabulary
17 Spring 2005 Data Video 2 Graphing Speed: Data Set 1 Distance [m] Constant slow motion Constant Fast Motion Slowing Down Speeding up Time [s]
18 Vocabulary Speed the distance an object moves in a certain time period speed = distance time Constant Speed Moving equally fast all the time.
19 Average vs. Instantaneous speed Add these words to your list Average speed is the distance traveled divided by the time to travel. Average Speed Total Distance Travel Time Covered Instantaneous speed is the average speed for infinitely small distances and times.
20 Explain that motion describes the change in the position of an object (characterized by a speed and direction) as time changes. Main Topic: Calculate Speed, Distance, or Time. Daily Review S/D/T relationship and formulas Practice Problems Vocabulary Homework: Complete the other side of the Calculating Speed Worksheet word problems for speed, distance and time. The last two are extra credit.
21 Understanding Speed
22 Acceleration and Deceleration (Negative Acceleration)
23 Main Topic: How forces affect motion Check homework Outline Study Guide Videos Homework quiz on Friday review study guide.
24 Vocabulary Velocity the speed of an object in a particular direction Acceleration a change in velocity Motion the change in position of an object with respect to time
25 Aristotle and Motion Idea that force causes motion goes back to the fourth century B.C.E. -- Greeks Divided into two types: Natural Motion Violent Motion
26 Aristotle and Motion Natural Motion Up or Down Objects seek a natural resting place -- boulders/ground smoke/high Circular motion is natural for the heavens. Planets and Stars revolve around Earth
27 Aristotle and Motion Natural Motion Since they are natural, they are not caused by forces.
28 Aristotle and Motion Violent Motion Imposed Motion a push or a pull External Cause Objects in their natural resting places could not move without a push or a pull If an object is moving against its nature then a force is responsible
29 Ideas About Motion These ideas were believed for over 2000 years.
30 Copernicus First to say that the Earth moved around the Sun. Worked in secret
31 Galileo A force is necessary to keep an object moving
32 Galileo Force = any push or pull Friction = the force that acts between materials that touch as they move past each other
33 Galileo Friction if friction were absent, a moving object would need no force to stay in motion
34 Galileo
35 Galileo If an object is moving, it is natural to keep moving. Every object resists change to its state of motion.
36 Galileo Inertia the property of a body to resist change
37 Newton Laws of Motion The first law (law of inertia) is a restatement of Galileo s idea.
38 Friction and Inertia
39 Newton Newton s First Law: Every object continues in a state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by forces exerted upon it.
40 Newton Simply put: Things keep doing what they are already doing.
41 Objects At Rest
42 Objects in Motion
43 In Review Inertia gives us a completely different view of motion. Ancients thought continual forces were needed to keep something in motion We now know that objects continue to move by themselves Forces may be needed to overcome friction and set things into motion at first. Once an object is moving in a force free environment, it will move in a straight line indefinitely.
44 Mass A Measure of Inertia Kick and empty can and it moves Kick a can filled with sand and it does not move as much Kick a can filled with nails and you ll have a sore foot Inertia: Can full of nails = most Can full of sand = less Empty can = least
45 Mass A Measure of Inertia Kick and empty can and it moves Kick a can filled with sand and it does not move as much Kick a can filled with nails and you ll have a sore foot Inertia: Can full of nails = most Can full of sand = less Empty can = least
46 Mass A Measure of Inertia The amount of inertia an object has depends on its mass the amount of material present in an object.
47 Mass A Measure of Inertia The more mass an object has The more inertia it has The more force it takes to change its state of motion
48 Mass is not volume
49 Mass is not volume
50 Mass is not weight
51 Objects with great mass have great weight Objects will little mass have little weight In the same location, twice the mass means twice the weight Mass and weight are proportional to each other
52 Measuring Mass and Force
53 Effects of Forces on Speed
54
55 Log Sheet 13.Motion Notes power point 14.Speed Worksheet 15. Motion Outline 16.Study Guide Motion Quiz
56
57
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Instructions for Vocabulary Cards: Please photocopy the following pages onto heavy card stock (back to back, so the word is printed on the back side of the matching definition). Then, laminate each page.
Forces and Motion. Reference: Prentice Hall Physical Science: Concepts in Action Chapter 12
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Chapter 4. Forces and Newton s Laws of Motion
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