Watch full lesson here: ed.ted.com/lessons/joshua-manl... Why would it be hard to pedal a 10,000 pound bicycle? This simple explanation shows how Newton's 3 laws of motion might help you ride your bike.
Newton's 4th law of motion -😃A book remains at rest and covered with dust until and unless some internal or external exam appears.😆 The speed of turning page is directly proportional to the syllabus to be covered and the tension remains constant. 😅🤣
Newton was really the true scientist who had changed the thinking habits of the people. Before him, people were facing the same kinds of problems but no one tried to find the reasons behind these happenings. I salute Newton for giving us a sense of thinking and imagining.
Sometimes, I feel Newton's third law of motion is forced to suite a narrattive, even when it doesn't necessarily explain a phenomena. It is hard to explain the applicability of the law in relations to the motion a bicycle. I think it is because the bicycle moves vertically, meanwhile the law suites horizontal motion. It better fits the working for a rocket going to space. But for a bicycle I find I awkward. Great video by the way
Divide mass of world by mass of cyclist. A person ways 70 kg whereas the earth ways something like 6,000,000,000,000,000,000,000,000 kg so we're talking something like more than 10,000,000,000,000 times more people than live on the planet atm.
+Matthew Smith This actually happens every morning in major cities world-wide in the morning commute. It's just that with their commute home at night, the world is set right again.
Nice video, but something missing or not directly stated, for Newton's 1st Law: Objects at rest tend to stay at rest *unless acted upon by an outside force.* Objects in motion tend to stay in motion with the same velocity (velocity is speed with direction, and depending on your frame of reference, it can be negative) *unless acted upon by an outside force.*
bruh he stated that, you need to apply force for your bicycle to start moving from rest but one it starts moving it becomes way esier to pedal.........
perfect! this explains it quite well. Nice demonstrations and real world examples that are easy to "rap my head around", however I would have added a bit more arrows to illustrate more forces which were applied / left out.
I really like when topics are used to relate a scientific concept. Here is a series about Psychology within the context of bicycle prejudice: ru-vid.com/group/PLFOOfdNQa2zteDZZED-loSpz6SSxLtCDE
How is it that TED education has so much better volume control than their regular videos on their director channel? The intro on that one is so much louder than the video itself.
Only on the rear wheel with power does the ground's reaction force push forward, on the front it has an opposite effect, to counter the friction of ye olde wheel bearing and such. The reaction force arrow shall point towards the rear on the front tire I declare!!
Tôi có một thắc mắc . Tuy là nó không liên quan đến ĐL của động lực học nhưng tại sao khi bánh xe căng hơi lại đi nhanh và nhẹ hơn so với bánh xe bị xịt hơi vậy ? Traslate from Vietnamese to English
One question: How does the bike stay upright? When a person mounts a bike and stays still (no kickstand or legs, just the two bike tires) they fall over. But, we said person is moving it is really easy to stay up. However, no new force is applied in the left/right direction to help keep the bike up? So how does the bike stay up while it is in motion?
momentum... it is too "focused" on moving in one direction, that is to say it alleviates the potential of falling left or right like a domino. Remember that there is also air resistance... aerodynamics keep it aliened as well, much like an arrow flies straight and only straight, until an external force (such as wind or gravity) interferes. I hope this helped in answering your question.
Todd Gobbett But why do three wheelers stand upright even if they are not moving? why only vehicles having below 2 wheels fall down when not in motion? I mean my bicycle falls down but my car or tricycle doesn't when in rest.
blasttrash Because then the weight is more evenly distributed throughout the 3 given points. The tricycle has more surface area to support its centre of gravity. A bicycle or unicycle does not.
I believe the speed of the bicycle does not allow it enough time to be pushed over by air on either side. Or in other words, the force applied in propelling the bicycle forward is more than the force applied by the air on either side. Then there's also the fact that the centre of masses of you and the bicycle are properly aligned I guess. Todd Gobbett gave a pretty good explanation as well.
gilgamesh2399 actually these are all bad explanations an arrow flies straight for a complitely different reason, air drag and gravity always work on it in flight bicycle is not "too focused" on forward movement, there is no such quantity in physics this is explained via precession, which is a very comlex mechanical concept that relies on the conservation of angular momentum a frisbee flies, a spinning ball changes direction, a spinning top stays stable - all due to precession thank you for asking questions btw to anyone who got it wrong: props for trying, it is better than not analysing at all. :)
My teacher in middle school explained the 3rd law like punching a wall. The softer you hit the wall the softer the molecules in the wall hit back, the harder you hit it the harder they hit back at you and that's why it hurts
O ato de iniciar a pedalada em uma bicicleta demonstra-se potencialmente mais desafiador do que manter uma velocidade constante, em virtude de fatores que incluem a necessidade de superar a inércia inicial, equilibrar-se adequadamente, ajustar as marchas de maneira pertinente, lidar com resistências iniciais e coordenar meticulosamente os movimentos. Tais desafios, entretanto, tendem a ser progressivamente superados por meio da prática sistemática e da aquisição de habilidades específicas associadas ao processo inicial de movimentação.
You have to be consider each object separately: 1. The bike pushes on the Earth such that it accelerates in the direction it is pushed. 2. Simultaneously, the Earth exerts a force on the bike in the opposite direction so the bike accelerates that way. You might understand this better if you consider rowing a boat. When your paddles push on the water, you send the water in one direction whilst travelling in the opposite direction. The foces are equal and simultaneous, acting on different objects.
That video gave the impression that the energy from the bouncing ball is all delivered to the floor that in return sends it back to the ball, is this accurate? I don't really have knowledge about physics but I have always thought that the bouncing ball bounces because it has less resistance to keep the energy in itself by contracting and releasing it by expanding. This also explains why the doesn't bounce off a surface that is softer than the ball itself. Please correct me if I'm wrong.
I believe it is a combination of both. Granted, you've probably learned this by now, since this comment was ten years ago, but for anyone else with the same question: There are two parts to this. First, the ball delivers its energy to the ground, and the ground pushes it back. However, how much the ball actually bounces does depend on factors such as softness of the ground (softer absorbs more energy) and resistance of the ball, e.g., material and density. The second part is why rubber bouncing balls bounce better than hard, dense baseballs or soft, barely dense cotton balls.
in the 3rd law ,is it an equal and an opposite reaction, or a reaction thats equal?they spoke differently in the 17th century than we do now.so did Newton word the 3rd law badly, or since we percieve/live in a 3 dimensional world are there two reactions to the original action?i.e. an equal reaction and an opposite reaction. i always thought the 3rd law was worded badly. it should be "an equal opposite reaction",not "an equal and opposite reaction".
