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Good feedback… |
An example that I have received |
An example that I have given |
An example that I have read |
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…includes three components: what was done well, what needs improvement, and specific suggestions for how to improve. |
Awesome blog, I really enjoyed the example of the car crash to Newton’s third law, it really helps give a better understanding of the law in a circumstance most people see in everyday life, but never notice. I also Love your gravitor of Apu from the simpsons. Although I regret to mention I notice one equation on your blog of newtons third law, is there any forces that could relate to this opposite and equal reactions that Newton mentions. Maybe forces like Gravity… and the net force our bodies apply to the ground when we are walking or the Applied forces from the cars before they crash and how the horizontal net force is being affected. And to answer your question on what other aspects in everyday life do you experience Newton’s third law, I notice it in construction in jackhammers, and wrecking balls, where both have to use acceleration and mass to do their jobs right. Enjoyed the blog- boymeetsphysics |
Bobby, I like the Einstein banner. I think that rainbows are a phenomenon that everyone witnesses in awe, and your blog post allows me to understand the physics behind rainbows more. Is there any possibility of a “triple rainbow” forming? What factor(s) would cause this “triple rainbow” to form? |
Really well explained. The blog looks great, and the post is very well organized. I liked how you had a bit of everything involved. You had videos, calculations, explanations, and definitions. And answering back to your question, I think its amazing that reflections and refractions can cause a beautiful rainbow to occur. My question is, if two people are standing in one area observing a rainbow from different locations, will both people be seeing the same thing? – yarjan9 |
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…relates to the topic and is specific |
Great post. You demonstrated the physics behind a car crash with a high degree of understanding. This is a topic that every student our age should be paying attention too because this is the age where we start driving, and we really should know of the dangers of driving before it is too late. I enjoyed the video, and it helped me understand the topic better. I’ve noticed that with new cars, there are a lot of safety features that prevent injuries during accidents. What physics do these new technological advancements in vehicles use that prevents injuries? – yarjan9 |
I like the use of videos and the diagrams, they contribute to the explanation of your topic. I feel that you were branching off more into the biology field near the end, and adding equations or graphs would benefit the readers, and allow them to relate the concept to physics. Besides that, great blog and nice background! | I like how you chose a topic that many students will find an interest in. Very good use of links on important words and pictures relating to your examples. Good topics to relate roller coasters on are acceleration and newtons laws as well as energy. I feel like you could go into more dept with the rides and that there is more behind energy then what you have here. For example explaining why potential energy changes into kinetic on rides. – universityphysics |
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… is manageable (e.g., limited to 2 or 3 specific items). |
Hey this was an interesting topic because im a new driver and the last thing i wanna do is crash! One thing that i liked was how you explained the video and made its thought connect to your thoughts. One thing that could be improved is you could add how car materials and design effect the crash and saftey ratings of vehicles. – davan123 |
I like the use of videos and the diagrams, they contribute to the explanation of your topic. I feel that you were branching off more into the biology field near the end, and adding equations or graphs would benefit the readers, and allow them to relate the concept to physics. Besides that, great blog and nice background! |
This was a nice blog which covered the information it promised to cover. It informed the readers well. Their isn’t much to write about the topic of physics and a rainbow, so next time I suggest picking a topic that can relate more to physics. Also I think that you should include a few more photographs or videos. But all in all it was nice. One question, where did the discovery of light refraction originate from? – mohitsharma1995 |
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… is expressed in a respectful, positive tone and in language meaningful to the blogger. |
Shiv, Thanks for sharing that video; safety standards are so important to saving lives. Can you dig any deeper as to how they determine if a car is safe? How does the car absorb the force so that it’s not transferred to the passengers? – grandoj |
Nice blog, you chose a really appealing topic! I also like how you included those videos, and your theme and background look nice too. I think if you added an equation, the explanations would be more understandable. |
Amazing topic Alene, and I really enjoy the game billiards pool. I really think that it was good that you made show to recognize that the game isn’t just about hitting a ball into a hole, but the cause and affect of the pool stick to the ball, and how the ball is affected by velocity. I also like how you talked about the acceleration of the ball being affected by the friction caused by the table to ball in static friction, amazing blog – boymeetsphysics |
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…is focused on the product or task, the processes used, not on the student as a person. |
i like how you end your topic with a question and how you relate to the video! i think you should add more calculations or use diagrams to show that the reaction and the action forces of both cars are equal – Little Asian |
Bobby, I like the Einstein banner. I think that rainbows are a phenomenon that everyone witnesses in awe, and your blog post allows me to understand the physics behind rainbows more. Is there any possibility of a “triple rainbow” forming? What factor(s) would cause this “triple rainbow” to form? |
What an original but great topic choice. I myself play pool, and find it vary fun. You did a great job explaining the physics behind billiards. I like your integration of the videos into your blog (really helpful). I would like to know if there is a differences in the speed of the ball if there is a spin on it ? I would also like to see more visuals (pictures). Overall great job! – amandeep6 |
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…is based only on the criteria for success which the class has agreed upon. |
I also like how you chose a common issue inside the world and directed it to the age bracket where worries least about safety. Maybe seeing these videos and reading more about this topic will allow them to drive safer. Interesting how you set up your blog very creative and a good use of emphasis on important words/phrases. – universityphysics |
Nice blog, you chose a really appealing topic! I also like how you included those videos, and your theme and background look nice too. I think if you added an equation, the explanations would be more understandable. | I loved how your blog started with an interactive video which readers can participate in. I also liked the labelled diagram of the ear which I found helpful to use when you explained how sound waves travel through different parts of the year. I feel that adding more graphs with equations and/or equations that pertain to the physics behind the travel of the sound wave to the ear would aid readers in understanding the mathematical concept of your topic. – physicsfunsicsod |
Newton’s Third Law states that:
To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions. (Wikipedia)
In a nutshell, for every action force, there is a reaction force with equal magnitude in the opposite direction. Newton’s third law can be observed every day in anyone’s life, however, many of us don’t realize this. One example is when we are walking. Our legs push down on the ground, the opposite reaction making us walk forward. There are so many examples that display Newton’s Third Law of Motion that I could go on forever.
However, the scenario that I think best exemplifies Newton’s Third Law is a car crash.
- Luckily there’s nobody inside!
How does the third law relate to a car crash?
In a car crash, the action force(s) are the cars colliding with each other. The reaction force is the force sent back due to the collision, which is what causes the damage to the car. When two cars are headed straight at each other, they are travelling in opposing directions. When they finally collide, if they apply the same amount of force, they will experience a reaction of equal magnitude. This causes the destruction of the front of both cars. Since FORCE IS EQUAL TO MASS MULTIPLIED BY ACCELERATION (F = ma), a car with a much greater mass will likely do better or even survive in a car crash compared to a car with a smaller mass, even if the two vehicles were travelling at the same acceleration.
Unfortunately, there is no specific formula that pertains to Newton’s Third Law, as it is a theoretical law that can only be visually seen. Luckily, Newton’s Third Law is very easy to see since the reaction force is evident right after the action force.
Before being released to the market, new car models must be tested in a crash facility. There, they undergo and must pass safety tests, which involve the infamous crash test dummy in a car speeding head on at a barrier. Here is a video of a crash test:
http://www.youtube.com/watch?v=G3G7EdL4_IQ
This video shows that as the car is speeding up toward the wall, it’s acceleration increases, while mass stays constant. This causes the total force to increase. When the car makes contact with the barrier, there is reaction of equal magnitude that arises from the car making contact with the barrier. The reaction force is easily visible in a car crash, which is why it is such a great way to show how Newton’s Third Law can be applied to our lives.
How do the developers determine the safety of the car?
The developers look at the aftermath of the test. With these results, they can determine whether or not the mass of the car should be increased, decreased, or if more safety features should be included, and conclude with the overall safety of the car. Every car has a “crumple zone”, an area of the car that is designed specifically to absorb the force of impact in collisions so that the force of the impact is not transferred to the passengers.
Which cars have the most reliable crumple zones?
Let’s start with the cars with the least reliable crumple zones. Race cars have the least reliable crumple zones because of their shape, lower mass, and higher rates of acceleration. SUV’s tend to have greater reliable crumple zones because they have a greater mass and are able to absorb more kinetic energy.
As far as materials are concerned, the materials used in cars does play a role in protection. For example, carbon fibre is flexible, light weight, and very durable.
Here’s a couple more scenarios where Newton’s Third Law is evident:
Today, many cars have safety features that prevent accidents. These features come into play before the accident, rather than after the collision occurs. They tend to use proximity sensors that detect the distance of other cars from the driver’s car. There are also safety indicators that tell the passengers to buckle their seatbelts, etc. So the new technological safety features don’t use Newton’s Third Law.
In what other ways do you think Newton’s Third Law can be shown in our everyday lives? Leave it in the comment section 🙂
References:
Elert, G. (2012). Action-Reaction. Retrieved May 21, 2012, from physics.info: http://physics.info/newton-third/
Newton’s laws of motion: Newton’s third law. (2012). Retrieved May 21 2012 from Wikipedia: http://en.wikipedia.org/wiki/Newton’s_laws_of_motion#Newton.27s_third_law
Newton’s Third Law. (n.d.). Retrieved June 12 2012 from iPod Physics: http://www.ipodphysics.com/force-newtons-third-law-of-motion.phpNewton’s Third
Law of Motion. (2012). Retrieved May 21 2012 from The Physics Classroom: http://www.physicsclassroom.com/class/newtlaws/u2l4a.cfm
YouCarPress. (2012, February 22). 2012 BMW 1-Series CRASH TEST . Retrieved from http://www.youtube.com/watch?v=G3G7EdL4_IQ
Woodford, C. (2012, April 19). Airplanes. Retrieved June 12 2012 from ExplainThatStuff: http://cdn4.explainthatstuff.com/newtons-laws-airplane.jpg
Newton’s Third Law states that:
To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions. (Wikipedia)
In a nutshell, for every action force, there is a reaction force with equal magnitude in the opposite direction. Newton’s third law can be observed every day in anyone’s life, however, many of us don’t realize this. One example is when we are walking. Our legs push down on the ground, the opposite reaction making us walk forward. There are so many examples that display Newton’s Third Law of Motion that I could go on forever.
However, the scenario that I think best exemplifies Newton’s Third Law is a car crash.
Luckily there’s nobody inside!
How does the third law relate to a car crash?
In a car crash, the action force(s) are the cars colliding with each other. The reaction force is the force sent back due to the collision, which is what causes the damage to the car. When two cars are headed straight at each other, they are travelling in opposing directions. When they finally collide, if they apply the same amount of force, they will experience a reaction of equal magnitude. This causes the destruction of the front of both cars. Since FORCE IS EQUAL TO MASS MULTIPLIED BY ACCELERATION (F = ma), a car with a much greater mass will likely do better or even survive in a car crash compared to a car with a smaller mass, even if the two vehicles were travelling at the same acceleration.
Before being released to the market, new car models must be tested in a crash facility. There, they undergo and must pass safety tests, which involve the infamous crash test dummy in a car speeding head on at a barrier. Here is a video of a crash test:
http://www.youtube.com/watch?v=G3G7EdL4_IQ
This video shows that as the car is speeding up toward the wall, it’s acceleration increases, while mass stays constant. This causes the total force to increase. When the car makes contact with the barrier, there is reaction of equal magnitude that arises from the car making contact with the barrier. The reaction force is easily visible in a car crash, which is why it is such a great way to show how Newton’s Third Law can be applied to our lives.
In what other ways do you think Newton’s Third Law can be shown in our everyday lives? Leave it in the comment section 🙂
References:
Elert, G. (2012). Action-Reaction. Retrieved May 21, 2012, from physics.info: http://physics.info/newton-third/
Newton’s laws of motion: Newton’s third law. (2012). Retrieved May 21 2012 from Wikipedia: http://en.wikipedia.org/wiki/Newton’s_laws_of_motion#Newton.27s_third_law
Newton’s Third Law of Motion. (2012). Retrieved May 21 2012 from The Physics Classroom: http://www.physicsclassroom.com/class/newtlaws/u2l4a.cfm
YouCarPress. (2012, February 22). 2012 BMW 1-Series CRASH TEST . Retrieved from http://www.youtube.com/watch?v=G3G7EdL4_IQ
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