FALLING OBJECTSFALLING OBJECTS

Presented by:Presented by:

Edna DIOLATA Brooklyn Technical H.S.Edna DIOLATA Brooklyn Technical H.S.

David LATMAN Clara Barton H.S.David LATMAN Clara Barton H.S.SMART 2007SMART 2007

Polytechnic UniversityPolytechnic University

The National Science FoundationThe National Science Foundation

How do mass and surface area affect How do mass and surface area affect descent?descent?

When an object falls through air, it usually encounters When an object falls through air, it usually encounters some degree of air resistance. Air resistance is the result of some degree of air resistance. Air resistance is the result of an object plowing through a layer of air and colliding with an object plowing through a layer of air and colliding with air molecules. The greater the cross-sectional area of an air molecules. The greater the cross-sectional area of an object, the greater the amount of air resistance it object, the greater the amount of air resistance it encounters since it collides with more air molecules. encounters since it collides with more air molecules.

When a falling object has a large mass, it weighs more and When a falling object has a large mass, it weighs more and will encounter a greater downward force of gravity. It will will encounter a greater downward force of gravity. It will have to accelerate for a longer period of time before there have to accelerate for a longer period of time before there is enough upward air resistance to balance the downward is enough upward air resistance to balance the downward force of gravity.force of gravity.

Addressing the StandardsAddressing the Standards

Standard 4 Science Standard 4 Science Explain and predict different patterns of motion of objects (eg. Explain and predict different patterns of motion of objects (eg. Linear and angular motion, velocity and acceleration, Linear and angular motion, velocity and acceleration, momentum and inertia.momentum and inertia.

Standard 5 Technology Explain Standard 5 Technology Explain how complex technological systems involve the confluence of how complex technological systems involve the confluence of numerous systems Explain how numerous systems Explain how computers and automation have changed the nature of work computers and automation have changed the nature of work Describe and model Describe and model methods (including computer based methods) to control methods (including computer based methods) to control system processes and monitor system outputssystem processes and monitor system outputs

Materials UsedMaterials Used

The The DeviceDevice

Breadboard, IR LED, PING, Breadboard, IR LED, PING, Servo Servo

Servo for trap doorServo for trap door

ResultsResults(time expressed in milliseconds)(time expressed in milliseconds)

Experiment 1: With Air Flow W/O Air Flow Experiment 1: With Air Flow W/O Air Flow Disk shape Disk shape 33 32 Box 33 32 Box 30 31 30 31 Cup 28 28 Cup 28 28

Experiment 2:With Air Flow W/O Air Flow Experiment 2:With Air Flow W/O Air Flow Obj.1(1.8g) 94 46 Obj.1(1.8g) 94 46 Obj.2(3.3g) 65 40 Obj.2(3.3g) 65 40 Obj.3(6.6g) 35 33 Obj.3(6.6g) 35 33

We would like to thank the following individuals who have We would like to thank the following individuals who have

guided us through this ‘perilous journeyguided us through this ‘perilous journey’:’: Professor Vikram KapilaProfessor Vikram Kapila Anshuman Panda, KwokKei (Keith) Ching, Anshuman Panda, KwokKei (Keith) Ching,

Sang Hoon (Nathan) Lee, Padmini Sang Hoon (Nathan) Lee, Padmini Vijayakumar, Jared Frank, Billy Mark, Shink Vijayakumar, Jared Frank, Billy Mark, Shink Lik Wong and most especially Daniel Lik Wong and most especially Daniel Remiszewski without whose tireless efforts, Remiszewski without whose tireless efforts, patience, and perseverance this project could patience, and perseverance this project could never have become reality. never have become reality.