ࡱ>  '` {>bjbj"9"9 7@S@S!1 L000D y y y8DylyD$x{{{{{$h0(j(({{ (X@{0{(J\P0{l{ g׽ ypB0$Ez200>7,c$"d$((((DDDR(ZDDD(ZDDD Gravity Unit Packet  Name: _____________________________ Period: _______ Date: (subject to change)Lesson/Worksheets/Labs: Score:Every DayStarter Questions (1 box/day)/12Every DayWS: Gravity Unit Vocabulary /3211/14(B) or 11/15 (A)Lesson: GravityWS: Bill Nye Gravity/2611/16 (B) or 11/19 (A)Lesson: Mass Vs. WeightLab: Gravity/8011/20 (B) or 11/26 (A)WS: Mythbusters Gravity Bullet Drop Test/3011/29 (B) or 11/30 (A)Quiz: Gravity/24WS: Gravity WA Review/24Total Unit Points Starter Questions: (3 points each)   (1 point each written item) Main Principals of Gravity Gravity _______________ all objects to its source. Gravity effects ___________________ in space. There are _________ factors that affect gravity: _________________ & __________________. Weight is completely dependent on __________________. _______________________________________________________________ Law of Gravity: ________________________________________________________________________ Vocabulary Terms you need for the test: Gravity Definition: What does gravity do to all objects in the universe? Gravity is affected by what two variables? __________ & _________ Everything with ___________ has gravity. The ______________ mass an object has; the _____________ gravity it will have too. Q: Why does Jupiter have more gravity than our planet (Earth?) A: The ___________________________ you are from the source of gravity; the ____________________ of gravity you will feel. Q: What will your weight read on a scale in space? A: Explain why objects in space are still hard to move: Weight Definition: A) Weight is completely dependent on: ___________________. B) The _____________ gravity there is; the ______________ weight an object will have. C) _______________ and ______________ are NOT the same thing! D) Explain why mass does not change: E) Explain why weight can change: F) How do we solve for weight? 3) Describe Galileos famous cannonball drop experiment:  A) The results of this experiment showed that all objects will do what? B) How have we proven in modern times that Galileo was correct? C) At what rate do all objects accelerate due to gravity on Earth?  What do we call the force that is pulling on everything? How many things in the universe have gravity? Where does gravity pull everything towards? What happens when Bill drops the bowling ball and the apple at the same time (which hits first)? What two objects fell at the same speed on the moon? Why does a scale tell us our weight? The larger something is: ____________________________ Why does the earth pull harder on us than anything else? Why dont the planets get pulled all the way into the sun? Why does Jupiter have more gravity than Earth? What shape does everything with gravity end up as? Why should skaters be worried about gravity? If the mass of an object determines its gravity and the sun is over 1000 times more massive than the Earth (which means its gravity is over 1000 times more powerful) why dont we fly off to the sun?   Part 1: Determine your weight on other planets: (1 point each) Materials: Calculator Procedure: Follow the steps to convert your weight into mass in the metric system. Calculate your weight on the other planets. Step 1: Conversion Your weight in pounds (use your best guess for this): ______________ lbs Multiply it by 4.448 N/lbs ______________ N Divide your weight (N) by 9.8 m/s2 for your Mass ______________ kg (You will use this number for the following exercise) Step 2: Determining your weight on other planets. Take your mass; multiply it by the Gravitational acceleration rate of that planet to determine what your weight in N and lbs would be for that planet: PlaceYour Mass [kg]Gravitational Acceleration for that planet [m/s2]Weight [N]Weight [lbs]Earth9.8 m/s2Moon1.6 m/s2Sun265.3 m/s2Jupiter23.2 m/s2Saturn10.4 m/s2 Questions: (2 points each) Between your weight on earth and the 4 other places to visit, which place would you feel the heaviest? Which place would you feel the lightest? Even though your weight is changing, is your mass changing along with your weight? What factor is causing all of the differences of weight? (Simply saying gravity is NOT correct!) Part 2: Mass v. Weight (1 point each) Materials: Balance Beam, Spring Scales, 3 random objects. Procedure: Take the following items and place them on the balance beam, then weigh them on the spring scale. Record your results. ItemBalance Beam [g]Spring Scale [N]Spring Scale [g] Questions: (2 points each) Which measurement involved gravity pulling down? What would a bathroom scale measure? Which measurement would change if you went to Mercury? Why? If you could take your balance and spring scale from the Earth to the Moon, which measurements would read the same for your objects and which would read differently? Explain your reasoning. Why should weight actually be given in Newtons (N) and not pounds (lbs)? Part 3: Fluid Friction and Gravity (1 point each) -need 1 piece of paper. -place the piece of paper on the scale and record the mass -drop the flat piece of paper from exactly 2 meters height and time the drop -Crumple the same piece of paper into a ball and recheck the mass -Now drop the crumpled paper from the same 2 meter distance -Record all your results: PaperMassTime to fallFlatCrumpled Questions: (2 points each) Did the mass change when you changed the shape of the paper? Did the weight of the paper change? What could explain the faster falling time in the crumpled up paper compared to the flat version. EXPLAIN IT! Part 4: Galileo Gravity Drop (1 point each) Now we will duplicate the same experiment as Galileo! Use the different cubes in pairs for each drop and compare how they fall! Set up your experiment as follows: Cube A Cube B  SHAPE \* MERGEFORMAT  Make sure the cubes are placed as close to the end as possible!! Tilt the block as evenly as possible and let the blocks fall. Make note of how they hit the ground. DONT USE WOOD!!! -Conduct 5 total tests (ON THE CARPET!!!) from 2 meters height -Record your data in the data table below: Mass of cube AMass of Cube BWhich cube hit first? A or B?Questions: (2 points each) What factors determines how much gravity an object has? The two blocks are basically hitting the ground at the same time; how would you explain this? Did the distance from which you dropped the cubes determine which hit the floor first? What if we dropped the cubes from 100 feet? How would the results change? So if all objects are pulled to the earth at the same rate of acceleration, why dont feathers and rocks hit the ground at the same time when dropped together? (2 points each question)  We will be watching a fantastic test conducted to see if Galileo was correct with his theory that gravity accelerates all objects the same amount. What does the basic myth say that they are trying to solve? Why should both bullets hit the ground at the same time? Even though the basic science concept sound right; what are some possible reasons why this has never been tested? Why will the ball bearing be an ok replacement for the bullet? Even though the Mythbusters say that the 1% difference in drop time doesnt matter, what might account for the difference? Knock Your Socks Off breakcontinue the questions when the Bullet Myth returns: Why is it important to know exactly when the paintball left the gun? Why is it important to know exactly how long it takes for the paintball drop hit the ground? Why is the paintball test not producing good data? Knock Your Socks Off breakcontinue the questions on the back when the Bullet Myth returns Why is it important to make sure the gun is perfectly level? Why is the bullet not hitting the boards at the same height at each distance? Why is conducting the test outside causing problems? Knock Your Socks Off breakcontinue the questions when the Bullet Myth returns Why do they need to check the high speed camera when they are checking their drop/fire rig? Knock Your Socks Off breakcontinue the questions when the Bullet Myth returns Compare the time (39.6 ms) difference to film (the example that Adam gives you) What was the Mythbusters conclusion? What do you think? Do you agree or disagree (GIVE A REASON WHY!!!)?  Which of these would have more gravity? Attempt: ______________________________________________________ Correct: ______________________________________________________ The result of gravity pulling on us is called: Attempt: ______________________________________________________ Correct: ______________________________________________________ Why cant the astronaut move the space station? Attempt: _____________________________________________________ Correct: ______________________________________________________ What doesnt change when you visit the moon: Attempt: ______________________________________________________ Correct: ______________________________________________________ When Galileo dropped the different size cannonballs from the tower, which hit the ground first? Attempt: ______________________________________________________ Correct: _______________________________________________________ True/False: A larger object will always weigh more than a smaller object: Attempt: ______________________________________________________ Correct: _______________________________________________________ Why do all the planets orbit around the Sun? Attempt: _______________________________________________________ Correct: ________________________________________________________ Why do feathers fall slower than rocks in normal conditions? Attempt: ________________________________________________________ Correct: _________________________________________________________ If the sun has so much more mass & gravity than the earth, why dont we get pulled all the way to the sun? Attempt: _________________________________________________________ Correct: __________________________________________________________ The proper unit for weight is: Attempt: ___________________________________________________________ Correct: ____________________________________________________________ What is Mass? Attempt: ____________________________________________________________ Correct: _____________________________________________________________ What would the mass of a 78 kg person be in space? Attempt: ____________________________________________________________ Correct: _____________________________________________________________  Gravity: What about the following image explains why the planets orbit the sun and not the other way around:       Why does your weight change when you travel to a different planet? Is gravity pulling or pushing you down (which is correct)? What makes mass different from weight? Why will satellites eventually crash back into Earth but not fly off to the Sun; if the Suns gravity is so much greater? What evidence is there that proved that gravity is still present even in outer space? Why do 2 objects hit the ground at the same time even if their masses are not the same? Why do we use Newtons (N) as the proper unit for weight? How do we know for sure that weight is due to gravitys force pulling you down but mass is not? If all objects are supposed to hit the ground at the same time, why wont a flat piece of paper fall at the same speed as a crumpled up ball of paper? Why are humans able to bounce so high when they walk on the Moon, but not on the Earth? If air resistance can slow a falling feather, why doesnt it slow down a falling bullet? If Earths gravity is pulling us down so hard, why dont we get pulled right through the floor to the center of the planet? Think about forces in a 3D universe for a minute; in the Bill Nye Gravity video, they claim that gravity makes all things balls. We know this is basically true as just about everything in the universe is ball shaped (planets, stars, etc); but use your skills of inference and you your understand of how gravity works to tell me why you think this is true that everything major in the universe is the shape of a sphere:     Being absent does not excuse you from missing work! It is your responsibility to get caught up! Make-up labs will be scheduled during Pride Time if you miss a lab. Make sure you come to these make up days! If you miss a starter question day, the questions are posted to the unit page on the class website after the class is over. /12 If you are missing any part of this worksheet, the answer key will be posted on the unit page of the class website after the review day (before the test) /32 /24 If you are absent for this quiz; you can find the answer key on the unit page of the class website. Make HONEST attempts at each question before checking the answers. /24 /30 If you are absent for this video; there will be a make up day scheduled for a Pride Time session. Watch on the schedule (found on the white board) for the dates you can do this. If you are absent for this lab; there will be a make up lab scheduled for a Pride Time session. Watch on the schedule (found on the white board) for the dates you can do this. /80 /26 If you are absent for this video; all Bill Nye Videos can be viewed either online (You Tube) or you can check the DVD out during Pride Time @ school in the Library. 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