To complete your evaluation of various materials for cell phonecases, you must create a case material evaluation report thatdescribes the motion and impact forces of several phone casematerials under evaluation.

1) To begin your evaluation of different case materials, youmust first define Newton?s laws of motion and then describe howeach of Newton?s laws applies to the motion you will be analyzing.As you will be presenting this report to various stakeholders, youhave been asked to write your definitions and descriptions with anontechnical audience in mind.

2) Once you have described the relevant laws of motion, createforce diagrams to model the motion for a phone dropped from a setheight. You should include diagrams, with their respective forcevectors, for each phone drop. In your diagrams, address thefollowing:

A) Define the height you will be using for eachphone drop. As the researcher, you will choose a drop height ofbetween 1 and 2 meters.

B) Using the provided mass of 6.2 oz, or bymeasuring the mass of a personal cell phone, determine the mass youwill be using for your calculations. Remember to add the mass ofthe case material.

C) In your diagram, show the direction and name ofeach force on the cell phone both at the drop point and at thepoint of collision with the ground.

3) Following the creation of the force diagram, use theinformation provided in your case specification document tocalculate the velocity before impact and deceleration at impact.Remember that deceleration is represented as negative accelerationin force equations. In your calculations, assume a standardfree-fall acceleration during the fall, and a velocity of 0m/s after the impact. You should include calculations for thefollowing scenarios:

A) A phone without a case

B) A phone with a silicone case

C) A phone with a hard plastic case

D) A phone with a rubber case

4) Using Newton?s second law, calculate the force of impact foreach scenario.

5) After you have completed your calculations, describe howforce equations model the given scenario. In your description,address the following elements:

A) Velocity before impact

B) Acceleration

C) Force

6) Finally, using data from your analysis, recommend the bestmaterial for a cell phone case. In your recommendations, addressthe following elements:

A) Which of the trials results in the lowest forceof impact on the phone?

B) What considerations, in physics or otherwise,might you have in recommending a material for a cell phonecase?

Test Material Phone Only 6.2 (No Case) OZ. Silicone Hard Plastic Mass Rubber 1.7 OZ. 1.1 OZ. 3.2 OZ. Collision Time 0.01 seconds 0.05 seconds 0.03 seconds 0.08 seconds