SEEd - Physics
Lesson Plans

Strand PHYS.1: FORCES AND INTERACTIONS

Uniform motion of an object is natural. Changes in motion are caused by a nonzero sum of forces. A "net force" causes an acceleration as predicted by Newton's 2nd Law. Qualitative and quantitative analysis of position, velocity, and acceleration provide evidence of the effects of forces. Momentum is defined for a particular frame of reference; it is the product of the mass and the velocity of the object. In any system, total momentum is always conserved. If a system interacts with objects outside itself, the total momentum of the system can change; however, any such change is balanced by changes in the momentum of objects outside the system. The time over which these paired forces are exerted determines the impact force.

Standard PHYS.1.1

Analyze and interpret data to determine the cause and effect relationship between the net force on an object and its change in motion as summarized by Newton's Second Law of Motion. Emphasize one-dimensional motion and macroscopic objects moving at non-relativistic speeds. Examples could include objects subject to a net unbalanced force, such as a falling object, an object sliding down a ramp, or a moving object being pulled by a constant force. (PS2.A)

• Popsicle Bridge
  You are part of a team of engineers who have been given the challenge to design a bridge out of popsicle sticks and glue. Bridges must be able to hold at least 20 pounds. The bridge must span at least 14 inches in length. But, it must be longer than 14 inches because when it has been constructed, it will be placed between two desks so it is at least one foot above the floor for a weight-bearing test. In addition to meeting the structural and weight bearing requirements, the bridge will be judged on its aesthetics as well, so be creative! And, you are encouraged to use the fewest number of popsicles possible to achieve your goal.Budget: $20,000Materials:Popsicle Sticks: $200 eachGlue Sticks: $300 eachString: $50/inchYou will present your results to the class using Keynote and iMovie.

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