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09 -23- 11 Agenda HOMEWORK CHECK Place on your desk: *Calculator *Orange homework chart *Merrily We Roll Along Lab 1) What force on earth causes falling objects fall downward? gravity 2) True or False: The less steep the incline, the smaller the acceleration. True 1) Warm-Up 5 min 2) Lab + Graph Due! 3) Test Review Handout 4) Free Fall Acc. Notes 20 min 5) Formula Sheet 5 min 6) Free Fall Video 10 min 7) Free Fall Acc. Worksheet 30 min 8) Review Sheet 20 min Free Fall Why does an object fall to the ground when dropped? GRAVITY Gravity pulls objects towards the Earth at an acceleration 9.8 meters/sec/sec (m/s2). Free Fall: How Fast Elapsed time – the time that has passed since the beginning of the fall. In free fall, an object accelerates at a rate of 10 m per second every second Free Fall: How Fast To calculate velocity in free fall: velocity = acceleration X time or v=gt Remember: g= acceleration due to gravity Free Fall: How Far How fast something falls is different from how far it has fallen Free-Fall: How Far? To calculate distance fallen: distance=1/2g X time or d=1/2gt2 2 Elephant VS Feather With no other resistance, they both fall with the SAME ACCELERATION: 10 m/sec/sec But we all know the elephant would land first. Why? Answer: AIR RESISTANCE Air resistance alters the motion of falling objects by adding additional forces. DUE TODAY: • Free-Fall Notes (KEEP) “In all things of nature there is something of the marvelous.” Aristotle DUE NEXT CLASS: • Free Fall Acceleration WS • Test Review Sheet • Bring Calculator! In front of dividers: •Homework chart (orange) •Formula chart (purple) •Syllabus •Lab Safety Rules •Coupon (green) Notes/Handouts •Acceleration notes •Distance & Displacement Notes II •Distance & Displacement Notes I •Physics Vocab. Chart •Sig. Fig Handout •Linear Motion Notes •“About Science” Notes Quizzes •Safety Quiz •Speed/Velocity Quiz Daily Work •Linear motion reading assignment •Writing a hypothesis •All homework assignments Labs •Distance & Displacement Lab •Toy car lab Misc. •Lose papers