Post created by: Leiticia
It is amazing to see how much physics apply in our everyday life without even notice it. In our lecture, we have learned Newton’s third law states, every force has an equal or opposite reaction FobjectA=-FobjectB. Also, Newton had explained that an object has a weight which is equal to the mass of the object multiplied by the gravity (9.8m/s2). A normal force as a contact force perpendicular to the contact surface that prevent two solid objects from passing through one another is equal to negative force of the weight. And friction is the contact force that is parallel to contact surface, it may be static or kinetic this help with the balance of the object. Walk up is one thing that we do every day without falling on the ground and friction is something that we create between us (a person) with the ground, this explains the Newton’s third law.
As we know that we have weight, this is our force, and when we stand on the road the same force, we apply on the ground apply back to us. When we start walking, our force that we apply on the ground get back to us to push us forward. We create a resistance this is called friction or traction between our foot and the road which keep us in balance or in control of ourselves, if accidentally our feet get in contact with a banana peel, we end up to fall because the banana peel reduced the friction between our feet and the surface road. It still confused to understand, how this can be possible.
Here in Bernie Hobbs article May the force be against you published in February 2nd, 2011, she explains how Newton’s law apply while walking she stated that Newton's second law is also the reason most of us find Newton's third law confusing, because most of our everyday movements involve one very heavy thing — planet Earth. Take walking. We walk by pushing down and backwards on the ground. The ground, obedient slave to the laws of physics that it is, pushes up and forwards on our feet, propelling us along. The two forces are exactly the same size, but while the upwards ('reaction') force is strong enough to push your feet up and away, you won't see the floor moving out behind you. The floor itself mightn't be that heavy, but it's attached to the ground. In physics, that makes the floor part of the Earth, so the force of your downward step is actually applied to the entire planet, floor included. And the planet weighs about 100,000 million billion times as much as you do, so it's no wonder you don't see any movement on its part when you walk, jump or push against anything attached to the ground! Weirder still, while you can't see any movement, the force of your footstep will actually make the whole planet move (accelerate) — but it's such an infinitesimally small movement there's no way you could notice it. Especially not with all those other clods walking, driving and jumping around all over the place accelerating it in different directions! (Hobbs 2011).
Knowing that you can't see its effect when you walk doesn't make Newton's third law any easier to swallow, so it's a good thing you can easily see the reaction to your down-and-back foot action whenever you walk on something that's not that firmly attached to the ground. (Hobbs, 2011).
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