MOTION THE EFFECTS OF FORCES ON MOTION FORCE

MOTION: THE EFFECTS OF FORCES ON MOTION

FORCE: THE CAUSE OF MOTION (MAKE THINGS MOVE) THERE ARE 2 KINDS OF FORCE: * PUSH * PULL

MANY FORCES CAN ACT ON AN OBJECT • GRAVITY • FRICTION • MAGNETIC • CONTACT

GRAVITY: FORCE OF ATTRACTION TOWARDS ANOTHER OBJECT PBS KIDS GRAVITY CLIP • HTTP: //WWW. YOUTUBE. COM/WATCH? V=AFGJ 4 Q 2 J 9 MW

FRICTIO N ACTS IN OPPOSITE DIRECTION OF OBJECT SLIDING • HTTP: //HOMEWORKZONE. TVOKIDS. COM/VIDE OS/GRAVITYANDFRICTIONDOWNHILLSKIING

MAGNETI C STRONG FORCE UPON ANOTHER OBJECT • HTTP: //WWW. TVOKIDS. COM/VIDEOS/MAGNETI SM

CONTA CT TWO OBJECTS TOUCHING EACH OTHER

BALANCED AND UNBALANCED FORCES • BALANCED FORCE: ALL FORCES ACTING ON AN OBJECT ARE EQUAL, NO MOTION • UNBALANCED FORCE: ONE OR MORE FORCES ACTING ON THE OBJECT ARE STRONGER THAN OTHERS= MOTION (NET FORCE)

LET’S TAKE A CLOSER LOOK! • HTTP: //WWW. YOUTUBE. COM/WATCH? V=HEJOYBRXCLK

MASS : THE AMOUNT OF MATTER IN AN OBJECT • MORE MASS = MORE INERTIA • BIGGER OBJECTS ARE HARDER TO START AND STOP

INERTIA • DESCRIBED BY SIR ISAAC NEWTON- 1 ST LAW OF MOTION (AKA: THE LAW OF INERTIA) • THE TENDENCY OF AN OBJECT TO KEEP DOING WHAT IT WAS ALREADY DOING • (THINK OF THE TERM LAZY) EX: COMMERCIAL: OBJECTS AT REST STAY AT REST, OBJECTS IN MOTION STAY IN MOTION EX: GOLF PHYSICS HTTP: //WWW. YOUTUBE. COM/WATCH? V=GYGGHVCAAPW THE GREATER THE MASS= THE GREATER THE INERTIA • LET’S LOOK AT THE TOY BOX PHYSICS LINK: • HTTP: //WWW. YOUTUBE. COM/WATCH? V=DQEGYXH 9 SES

LET’S TRY SOME ACTIVITIES TO SEE INERTIA IN ACTION • 1. MAGIC TRICK WITH CARD, GLASS AND PENNY • WHAT HAPPENED? • 2. CURRENCY EXCHANGE • WHAT HAPPENED? • 3. CATCHING WASHERS • WHAT HAPPENED?

WHAT IS MOTION? CHANGE IN POSITION OVER TIME • MASS INFLUENCES- GREATER MASSES HAVE GREATER MOTION

REFERE NCE POINT THE POINT TO WHICH OTHER THINGS ARE COMPARED • HTTP: //WWW. YOUTUBE. COM/WATCH? V=SA 2 Z YD 2 A 45 C