2.2 
Jump to Book CoverPrevious Page
Next Page

Videos:
Interactive Simulations   Position and displacement in one dimension    Displacement and position in two dimensions    Solve v=dx/dt for dt    Velocity, position, and time (basic version)    Velocity, position, and time (more advanced version)    Acceleration (basic version)    Acceleration (more advanced version)    Static equilibrium    Static equilibrium and the lever    Newton's second law (basic version)    Newton's second law (more advanced version)    Circular motion interactive simulation    Orbits of the planets and dwarf planets    Orbits simulation Interactive Calculators   Speed calculator    Velocity calculator    Acceleration calculator    Velocity in accelerated motion    Average velocity calculator    Hooke's law calculator    Torque calculator    Rotational equilibrium and torque    Newton's second law calculator    Momentum calculator    Angular velocity    Linear velocity and angular velocity    Centripetal acceleration    Centripetal force    Law of universal gravitation calculator
1 - Science of Physics
2 - Forces and Motion      Chapter 2 at a glance      2.1 - Motion      2.2 - Force, momentum, and Newton's laws      2.3 - Circular motion      2.4 - Solving harder physics problems      2.5 - Chapter review3 - Energy Transformations4 - Waves and Sound
5 - Electricity and Magnetism
6 - Light and Optics
7 - The Atom
8 - Linear Motion
9 - Vectors and Forces
10 - Forces
11 - Newton's Laws and Gravitation
12 - Circular Motion and Gravitation
13 - Torque and Static Equilibrium
14 - Momentum and Collisions
15 - Angular momentum
16 - Power and Machines
17 - Harmonic Motion
18 - Waves
19 - Sound
20 - Electricity
21 - Electric and Magnetic Fields
22 - Electromagnetism and Induction
23 - Light and Color
24 - Geometrical Optics
25 - Electromagnetic Radiation
26 - The Properties of Matter
27 - Thermodynamics and Heat Transfer
28 - The Atom
29 - The Quantum Theory
30 - TBD
31 - TBD
32 - TBD
33 - TBD
34 - TBD
35 - TBD
36 - TBD
37 - The atomic nucleus and radioactivity
38 - Nuclear reactions
39 - Relativity
40 - Particle physics and the standard model
41 - Electronics (semiconductors)
42 - Nuclear technology
43 - Lasers and photonics
44 - Metals, alloys and materials science
45 - Communications technology
46 - Buildings and structures
47 - Energy technology
48 - Biophysics
49 - Matter and Energy, Space and Time
50 - Energy Transformations
51 - Nanotechnology
52 - Website Videos
53 - ExtraStuff
55 - Modeling Motion, Friction, and Center of Mass
56 - Work and the Conservation of Energy
Design an egg drop container
Design challenge Materials for the egg drop challenge Create container or package that contains a raw egg and protects it from breaking when dropped from a height of two meters.
Materials: 20 straws; 10 popsicle sticks; 20 toothpicks; 10 sheets of newspaper; 1 roll of toilet paper; 1 roll of duct tape; 1 set of cotton balls; and a supply of cardboard.
Other constraints: maximum mass of 1 kg; maximum size of 30 cm on a side; no use of bubble wrap; no parachutes; and the shock absorbing material must be located inside the container.
Change in momentum and force Egg broken on hard floor and unbroken on pillow If you drop an egg, the hard floor exerts a sudden and strong force on the egg. The egg will rapidly lose its momentum and... splat! Now imagine dropping it on a pillow. The pillow will cause the egg to change its momentum over a longer time, which corresponds to the pillow exerting a weaker force on the egg throughout the process. The same principle lies behind automobile air bags, which cushion a passenger in a collision by increasing the time that his momentum changes. Show Alternate expression of Newton's second law
Design a container to cushion the egg Choose one or two parameters that might be varied: number of embedded containers-within-containers; padding material; configuring padding material (wadded, crumpled, layered); shape of containers and/or device holding the egg; and so on. Sketch a design on paper that will allow you to change these parameters to test how variants will perform.
Prototype Create the prototype of your design. Were there unforeseen problems you encountered when constructing the prototype that led to immediate design changes? If so, then update your design.
Test Test versions of your prototype by varying the design parameters you identified. Before running any test, agree upon what you will be evaluating at the conclusion of each test, such as damage to the container or a test object located inside.
Evaluate How did your container perform for differences of the design parameters? What evidence did you gather that led you to those conclusions?
Revise Based on your evaluation, improve your design. Then prototype and test it in preparation for the final performance evaluation.
Final performance evaluation The teacher will evaluate each submitted container by: measuring its mass (must be less than 1 kg); measuring its dimensions (maximum width 30 cm); and dropping the container from a height of 2 m. If your container succeeded in this test, then how high can your container fall without the egg breaking? After completion of the egg drop, each student group will present to the class a short summary of their design concepts and how their design performed.

82 Previous Page Next Page