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NEWTONS SECOND LAW 8 TH GRADE PGS. 556-559. FINISH AND COMPLETE FINISH FRICTION LAB FINISH FRICTION LAB REPEAT LAB IF NECESSARY REPEAT LAB IF NECESSARY.

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Presentation on theme: "NEWTONS SECOND LAW 8 TH GRADE PGS. 556-559. FINISH AND COMPLETE FINISH FRICTION LAB FINISH FRICTION LAB REPEAT LAB IF NECESSARY REPEAT LAB IF NECESSARY."— Presentation transcript:

1 NEWTONS SECOND LAW 8 TH GRADE PGS

2 FINISH AND COMPLETE FINISH FRICTION LAB FINISH FRICTION LAB REPEAT LAB IF NECESSARY REPEAT LAB IF NECESSARY

3 OBJECTIVES STUDENTS WILL… EXPLAIN NEWTONS SECOND LAW OF MOTION EXPLAIN NEWTONS SECOND LAW OF MOTION PRACTICE SOLVING EQUATIONS USING NEWTONS SECOND LAW PRACTICE SOLVING EQUATIONS USING NEWTONS SECOND LAW UNDERSTAND HOW GRAVITY IS RELATED TO WEIGHT AND MASS UNDERSTAND HOW GRAVITY IS RELATED TO WEIGHT AND MASS

4 FORCE AND ACCELERATION NEWTONS SECOND LAW OF MOTION STATES WHEN A FORCE ACTS ON AN OBJECT, THE OBJECT ACCELERATES IN THE DIRECTION OF THE FORCE. STATES WHEN A FORCE ACTS ON AN OBJECT, THE OBJECT ACCELERATES IN THE DIRECTION OF THE FORCE. ACCELERATION (M/S 2)= NET FORCE (NEWTONS) ACCELERATION (M/S 2)= NET FORCE (NEWTONS) MASS (KILOGRAMS) MASS (KILOGRAMS)

5 THINK ABOUT IT…. THE FORCE NEEDED TO CHANGE THE MOTION OF AN OBJECT DEPENDS ON ITS MASS. THE FORCE NEEDED TO CHANGE THE MOTION OF AN OBJECT DEPENDS ON ITS MASS. IF YOU HAD 2 SHOPPING CHARTS-ONE THAT WAS EMPTY AND ONE THAT WAS FULL OF GROCERIES WHICH ONE WOULD BE EASIER TO STOP AND WHY? IF YOU HAD 2 SHOPPING CHARTS-ONE THAT WAS EMPTY AND ONE THAT WAS FULL OF GROCERIES WHICH ONE WOULD BE EASIER TO STOP AND WHY? NEWTONS SECOND LAW NEWTONS SECOND LAW NEWTONS SECOND LAW NEWTONS SECOND LAW

6 GRAVITY WHAT DO YOU KNOW ABOUT GRAVITY? WHAT IS GRAVITY? WHAT DO YOU KNOW ABOUT GRAVITY? WHAT IS GRAVITY?WHAT IS GRAVITY?WHAT IS GRAVITY? IT IS A FORCE THAT EXISTS BETWEEN ANY TWO OBJECTS THAT HAVE MASS. IT IS ATTRACTIVE AND PULLS OBJECTS TOWARDS EACH OTHER. (PG. 557) If…Then Gravity… Mass is larger Mass is smaller Distance increases Distance decreases

7 GRAVITY WHAT IS THE DIFFERENCE BETWEEN MASS AND WEIGHT? (PG.558) WHAT IS THE DIFFERENCE BETWEEN MASS AND WEIGHT? (PG.558) ON MARS, THE WEIGHT WOULD ________ BECAUSE _______________. ON MARS, THE WEIGHT WOULD ________ BECAUSE _______________. THE MASS WOULD _____________ BECAUSE _____________________. THE MASS WOULD _____________ BECAUSE _____________________. WeightMass

8 FOR NEXT TIME… READ PGS DEFINE CENTER OF MASS ON INDEX CARDS. READ PGS DEFINE CENTER OF MASS ON INDEX CARDS. FINISH FRICTION LAB IF NEEDED. FINISH FRICTION LAB IF NEEDED. EQUATION PRACTICE WITH NEWTONS SECOND LAW ON BLUE.MSSCIENCE.COM EQUATION PRACTICE WITH NEWTONS SECOND LAW ON BLUE.MSSCIENCE.COM HEAD PHONES/EAR BUDS FOR CLASS ON MONDAY.

9 VIRTUAL LAB: WHAT IS NEWTONS SECOND LAW OF MOTION? 8 TH GRADE

10 GAME PLAN FIND AND SIT WITH YOUR LAB PARTNER FOR TODAY. FIND AND SIT WITH YOUR LAB PARTNER FOR TODAY. READ AND REVIEW THE DIRECTIONS FOR TODAYS VIRTUAL LAB. READ AND REVIEW THE DIRECTIONS FOR TODAYS VIRTUAL LAB.PARTNERS KELSEY/JESSICAJAKE/ALEC DJ/JACK CHESCA/LILLY KELSEY/JESSICAJAKE/ALEC DJ/JACK CHESCA/LILLY RYAN/CONNOR JOSH/BRANDON MCKENNA/SARAH RYAN/CONNOR JOSH/BRANDON MCKENNA/SARAH BRADLEY/AMBROS KAYLA/COURTNEY CHARLIE/JEREMY BRADLEY/AMBROS KAYLA/COURTNEY CHARLIE/JEREMY ANDREW/CALEB ELLA/ALEXIS ANDREW/CALEB ELLA/ALEXIS

11 OBJECTIVES STUDENTS WILL RELATE NEWTONS SECOND LAW OF MOTION TO THE EFFECT OF GRAVITY ON FALLING OBJECTS RELATE NEWTONS SECOND LAW OF MOTION TO THE EFFECT OF GRAVITY ON FALLING OBJECTS DETERMINE THE EFFECT OF MASS ON THE ACCELERATION RATE OF FALLING OBJECTS DETERMINE THE EFFECT OF MASS ON THE ACCELERATION RATE OF FALLING OBJECTS OBSERVE THE EFFECT OF GRAVITATIONAL CONDITIONS ON THE RATE AT WHICH OBJECT OF IDENTICAL MASS FALL. OBSERVE THE EFFECT OF GRAVITATIONAL CONDITIONS ON THE RATE AT WHICH OBJECT OF IDENTICAL MASS FALL. GIVEN MASS AND ACCELERATION, COMPUTE FORCE. GIVEN MASS AND ACCELERATION, COMPUTE FORCE.

12 VIRTUAL LAB PLEASE TAKE WITH YOU TO THE COMPUTER LAB…. LAB DIRECTIONS/WORKSHEET LAB DIRECTIONS/WORKSHEET PEN/PENCIL PEN/PENCIL CALCULATOR CALCULATOR SCIENCE TEXTBOOK SCIENCE TEXTBOOK

13 FOR NEXT TIME… COMPLETE VIRTUAL LAB IF NEEDED. COMPLETE VIRTUAL LAB IF NEEDED.

14 NEWTONS SECOND LAW 8 TH GRADE CIRCULAR MOTION, AIR RESISTANCE, CENTER OF MASS

15 DO NOW…. FOR THE FOLLOWING ACTIONS, EXPLAIN WHETHER THE FORCES INVOLVED ARE BALANCED OR UNBALANCED. FOR THE FOLLOWING ACTIONS, EXPLAIN WHETHER THE FORCES INVOLVED ARE BALANCED OR UNBALANCED. A. YOU PUSH A BOX UNTIL IT MOVES. A. YOU PUSH A BOX UNTIL IT MOVES. B. YOU PUSH A BOX BUT IT DOESNT MOVE. B. YOU PUSH A BOX BUT IT DOESNT MOVE. C. YOU STOP PUSHING A BOX AND IT SLOWS DOWN. C. YOU STOP PUSHING A BOX AND IT SLOWS DOWN.

16 WATCH IT! MASS AND WEIGHT MASS AND WEIGHT MASS AND WEIGHT MASS AND WEIGHT A WORLD WITHOUT FRICTION A WORLD WITHOUT FRICTION A WORLD WITHOUT FRICTION A WORLD WITHOUT FRICTION

17 OBJECTIVES STUDENTS WILL… EXPLAIN WHY THE DIRECTION OF FORCE IS IMPORTANT IN CIRCULAR MOTION AND AIR RESISTANCE EXPLAIN WHY THE DIRECTION OF FORCE IS IMPORTANT IN CIRCULAR MOTION AND AIR RESISTANCE DESCRIBE THE CENTER OF MASS IN REGARDS TO MOTION DESCRIBE THE CENTER OF MASS IN REGARDS TO MOTION KHAN ACADEMY KHAN ACADEMY KHAN ACADEMY KHAN ACADEMY

18 USING NEWTONS SECOND LAW (PG ) AccelerationDirection of Force Speeding Up Slowing Down Turning

19 USING NEWTONS SECOND LAW NEWTONS SECOND LAW OF MOTION CAN BE USED TO CALCULATE ACCELERATION. NEWTONS SECOND LAW OF MOTION CAN BE USED TO CALCULATE ACCELERATION. TRY THESE PRACTICE PROBLEMS. (REMEMBER THE EQUATIONS!) TRY THESE PRACTICE PROBLEMS. (REMEMBER THE EQUATIONS!) 1) A NET FORCE OF 4,300 N ACTS ON A CAR WITH A MASS OF 1,600 KG. WHAT IS THE ACCELERATION OF THE CAR? 1) A NET FORCE OF 4,300 N ACTS ON A CAR WITH A MASS OF 1,600 KG. WHAT IS THE ACCELERATION OF THE CAR? 2) A BOOK WITH A MASS OF 2 KG IS PUSHED ALONG A TABLE. IF THE NET FORCE ON THE BOOK IS 1 N, WHAT IS THE BOOKS ACCELERATION? 2) A BOOK WITH A MASS OF 2 KG IS PUSHED ALONG A TABLE. IF THE NET FORCE ON THE BOOK IS 1 N, WHAT IS THE BOOKS ACCELERATION? 3) A BASEBALL HAS A MASS OF 0.15 KG. WHAT IS THE NET FORCE ON THE BALL IF ITS ACCELERATION IS 40 M/S 2? 3) A BASEBALL HAS A MASS OF 0.15 KG. WHAT IS THE NET FORCE ON THE BALL IF ITS ACCELERATION IS 40 M/S 2?

20 Definition: Examples of Circular Motion: Centripetal Force: Circular Motion Video Circular Motion Pg:

21 FOR NEXT TIME… READ PGS READ PGS DEFINE NEWTONS THIRD LAW ON INDEX CARD DEFINE NEWTONS THIRD LAW ON INDEX CARD WATCH NEWTONS SECOND LAW ON KHAN ACADEMY WEBSITE WATCH NEWTONS SECOND LAW ON KHAN ACADEMY WEBSITE THIS IS ALL DUE FRIDAY, 11/1! THIS IS ALL DUE FRIDAY, 11/1!

22 DROP THE OBJECT ACTIVITY: EXPLORING AIR RESISTANCE 8 TH GRADE

23 REVIEW TIME WITH YOUR LAB GROUP, ANSWER THE QUESTION ON THE INDEX CARD. BE PREPARED TO SHARE YOUR ANSWER WITH THE REST OF THE CLASS. WITH YOUR LAB GROUP, ANSWER THE QUESTION ON THE INDEX CARD. BE PREPARED TO SHARE YOUR ANSWER WITH THE REST OF THE CLASS.

24 Definition: a form of friction that acts to slow down any object moving in the air. Gets larger when: object moves faster Depends on: size and shape of an object Terminal Velocity (aka final velocity): an object falling at a constant speed when air resistance balances the force of gravity Air Resistance Pg. 561

25 CENTER OF MASS THE POINT IN AN OBJECT THAT MOVES AS IF THE OBJECTS MASS WERE CONCENTRATED AT ONE POINT. CENTER OF MASS-IS THE POINT IN AN OBJECT THAT MOVES AS IF THE OBJECTS MASS WERE CONCENTRATED AT ONE POINT. FOR SYMMETRICAL OBJECTS (LIKE A BALL): THE CENTER OF MASS IS AT THE OBJECTS CENTER. FOR SYMMETRICAL OBJECTS (LIKE A BALL): THE CENTER OF MASS IS AT THE OBJECTS CENTER. FOR OTHER OBJECTS: THE CENTER OF MASS IS WHERE THE NET FORCE IS BEING APPLIED. FOR OTHER OBJECTS: THE CENTER OF MASS IS WHERE THE NET FORCE IS BEING APPLIED.

26 ACTIVITY- HOW DOES AIR RESISTANCE AFFECT FALLING OBJECTS? REVIEW DIRECTIONS AND PROCEDURES REVIEW DIRECTIONS AND PROCEDURES COMPLETE ACTIVITY WORKSHEET COMPLETE ACTIVITY WORKSHEET QUESTIONS? QUESTIONS?

27 SELF CHECK QUESTIONS WITH YOUR LAB GROUP, COMPLETE SELF- QUESTIONS #2-6 PG. 568 IN YOUR SCIENCE NOTEBOOK. WITH YOUR LAB GROUP, COMPLETE SELF- QUESTIONS #2-6 PG. 568 IN YOUR SCIENCE NOTEBOOK. CHECK AND REVIEW QUESTIONS. CHECK AND REVIEW QUESTIONS.

28 FOR NEXT TIME…. ON KHAN ACADEMY, TAKE THE QUIZ ON ALL OF NEWTONS LAWS OF MOTION. ON KHAN ACADEMY, TAKE THE QUIZ ON ALL OF NEWTONS LAWS OF MOTION. ALL KHAN ACADEMY HOMEWORK ON NEWTONS LAWS DUE FRIDAY! ALL KHAN ACADEMY HOMEWORK ON NEWTONS LAWS DUE FRIDAY! FINISH SELF-CHECK QUESTIONS #2-6 PG. 658 IF NEEDED FINISH SELF-CHECK QUESTIONS #2-6 PG. 658 IF NEEDED


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