`InertiaMaeola Walker                  Chicago Board of Education                               1819 W. Pershing Rd.                               Chicago IL 60609                               (312)535-3730Objective:This lesson is for primary students.  The main objective of this mini-teach is for students to learn and understand what inertia is.  They will learn the difference between inertia for objects at rest and objects moving in a straight line. Materials Needed:Two dolls (Barbie & Ken), two carts (skates, skate board)Strategy:Place one doll in each cart.  Secure one doll with a rubber band, tape or string.  Push the carts into a wall.  Ask the students what happened and why.  (Doll not secured should fly out or fall forward).  Talk about seat belts. Materials Needed:Two identical coffee cans and a hammer.Strategy:Fill one of the cans with a mass (a piece of metal) that will stay in place.  Keep top opening of the cans away from the class when placing them on top of table or smooth surface floor.  Tap one can lightly with the hammer, and ask students to keep their eyes on the can.  Next tap the second can with the hammer, ask the students to watch that can and ask them which can rolled the farthest ... why?  (The can with the mass will not go as far as the empty can because the full can has a lot of inertia and tends to stay at rest). Materials Needed:A 2 X 4 block of wood, a dowel & a hammerStrategy:Drill a hole the diameter of the dowel through the block of wood.  Insert the dowel loosely into the block and hold the block precariously suspended.  Hit the top of the dowel with the hammer.  You will drive the dowel through the block, but the block of wood will not move since its inertia will try to keep it in place, even though that place happens to be in mid air.  Materials Needed:Large size textbook & friction beadsStrategy:Place a book on top of a large size desk top.  Give the book a thrust with one hand and see how far the book will slide across the desk top.  Next sprinkle beads on desk top then place the book on the top of the beads, now see how far the book will slide across the desk top.  The book has inertia in each case and tend to keep moving.  The reason the book stops in one case is friction. Materials Needed:A three foot length of dowel & a 2 X 5 boardStrategy:Drill a hole the diameter of the dowel in the board.  Cone shape one end of the dowel.  Place the dowel on the floor with the flat end of the stick (dowel) on the floor.  Next place the board on the cone end of the stick until at rest.  Raise the stick into the air and pound stick heavily onto the floor.  The board should slide to bottom of stick until it hits the floor...why?  (because of the inertia in the board.) Materials Needed:Three 3 X 5" boards & a hammerStrategy: Stack the boards on top of each other.  Hit the bottom board horizontally with the hammer.  Watch the two boards on top drop into place.  Repeat the process with the second board and watch the top board drop into place. Materials Needed:Felt or cloth table cloth8  Meter sticks4  Clamps2  Pool Balls1  Pool cue (wood dowel)1  One marker & a quarterStrategy:Stretch out the table cloth taut and pin it down with the meter sticks and clamps.  Put an eight inch circle in the center and another 14 inch circle around the eight inch one. Place the pool ball in the center with a quarter on top of it.  Challenge the students to knock the quarter outside the small circle.  Students may not hit the quarter with the pool ball they are shooting at it, and they may not start closer than the large circle. Materials Needed:A 5-gallon bottle, crochet hoop & ink pen with a flat topStrategy:Place the bottle on a table top.  Next balance hoop on bottle top then balance pen on top of hoop.  Snatch the hoop from the inside real fast and watch the pen drop into the bottle.  The only force acting on the pen is gravity which pulls it straight down. Performance Assessment:Students' performance assessment will be measured by their participation and interest in each activity followed by a test on inertia.  The students will leave the class with a through understanding of Newton's first Law of Motion. `