TOPIC # Postscript Choices Related to Modes of Transportation & The Laws of Motion
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1 TOPIC # Postscript Choices Related to Modes of Transportation & The Laws of Motion plus more info for GLOBAL CHANGE Savvy Consumer Choices! CLASS NOTES: pp 86-99
2 QUOTE FOR TODAY : Mathematical and mechanical principles are the alphabet in which God wrote the world. ~Robert Boyle
3 ANOTHER QUOTE FOR TODAY: If I have seen farther than other men, it is by standing on the shoulders of giants Sir Isaac Newton ( )
4 If I have seen farther... it is by standing on the shoulders of giants.
5 Reminiscent of..... SCIENCE IS A CUMULATIVE ENTERPRISE
6 1st Law of Motion (Law of Inertia) A moving object will continue moving in a straight line at a constant speed and a stationary object will remain at rest... unless acted on by an unbalanced force. p 97 box at top
7 Other ways of stating Law #1: Every body continues in its state of rest or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it. p 97
8 Newton s Laws in everyday life: 1 st LAW = The LAW of INERTIA!
9 EASY WAY of remembering the 1 st Law: The key word is CONTINUE." If a body is at rest, it continues to stay at rest; if moving, it continues to move in a straight line. p 97
10 2nd Law of Motion F = ma (Newton s Law of Motion) The acceleration (a) produced on an object by a force (F)... is proportional to the magnitude of the force (F)... and inversely proportional to the mass (m) of the object. a = F / m or F = ma p 97
11 GLOBAL CHANGE LINK: For every gallon of gas you use, you add ~ 22 pounds of CO 2 to the atmosphere. Recall Newton s 1st and 2nd Laws. Now consider the mass (and acceleration capabilities) of a large SUV (sport utility vehicle) vs. a small econo-car...
12 An SUV and a small econo-car are both at rest at a stop light. Which vehicle has a greater inertia? Choices: 1 = The SUV has a greater inertia because it has a greater mass and resistance to acceleration. 2 = The econo-car has a greater inertia because it has a greater ability to accelerate. 3 = Since both are at rest, their inertia is the same.
13 An SUV and a small econo-car are both at rest at a stop light. Which vehicle has a greater inertia? Choices: 1 = The SUV has a greater inertia because it has a greater mass and resistance to acceleration. 2 = The econo-car has a greater inertia because it has a greater ability to accelerate. 3 = Since both are at rest, their inertia is the same.
14 2 nd law reminds us that MASS is involved! Econo-car vs. SUV!! LARGE Acceleration (due to small MASS) SMALL Acceleration (due to larger MASS) a
15 3rd Law of Motion (Law of Force Pairs) For every action there is an equal and opposite reaction. 3rd Law = Law of Force Pairs p 97
16 Forces always occur in pairs; an action and a reaction. To every action force there is an equal and opposite reaction force. Whenever one body exerts a force on a second body, the second body exerts an equal and opposite force on the first body ACTION: Man pulls on spring REACTION : pulls on Spring pulls on man p 97
17 Understanding Car Crashes: It s Basic Physics As you watch the video, fill in the blanks on pp in CLASS NOTES. NOTE: This 20 minute video can be viewed in D2L under: Videos > Films & Videos Shown in Class
18 Epilogue: YOUR CAR & GLOBAL CHANGE (Being a GC Savvy Consumer) SAFETY vs. ENVIRONMENT?? What kind of car do you drive???
19 The Insurance Institute for Highway Safety is an independent, nonprofit, scientific, and educational organization dedicated to reducing the losses deaths, injuries, and property damage from crashes on the nation's highways. New YouTube Channel for IIHS: youtube.com/iihs Watch the IIHS test for The Smart Car!
20 Your CAR & GLOBAL CHANGE Fatality Rates for occupants of all vehicles involved in crashes (deaths per 100,000 vehicles)
21 ... more (or less?) SAFETY
22 QUESTIONS TO PONDER! -- Are large SUVs & Pickups safer just because of their size and mass? --- Now that we have hybrid SUV s will that solve the problem of their notoriously low gas mileage and larger contribution of CO 2 to the atmosphere compared to smaller cars?
23 Suppose the traffic accident mortality rate goes up because cars are made smaller to preserve fuel. Is that a good trade- off?
24 Is it environmentally irresponsible or a good safety practice to own a large SUV or pickup truck that gets mileage of LESS than 20 mpg?
25 What else is important to consider???
26 HAVE A GREAT WEEKEND See you next Tuesday for our LAST CLASS!! Go CATS!
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