Third law Definition and 371 Threads

Pushy Astronaut -------------------------------------------------------------------------------- a) An astronaut of mass 70 kg pushes off a satellite of mass 420 kg, exerting a force of 120 N for the 0.83 s they are in contact. What is the speed of the astronaut after they have separated...

So I have a homework question that says: A 100 kg hockey player a 112kg hockey player collide with each other each traveling with a force of 50N. The textbook answer says that the acceleration of the 112kg is 0.89m/s^2 and the acceleration of the 100kg player is -1.0 m/s^2. I'm confused...

The inverse square law for gravitation was deduced from Kepler's third law. So how was the inverse square law for electrostatics(Coulomb's law) deduced?

Hello, I wonder if any of you would be kind enough to help a layman? I seem to remember a friend once told me that everything vibrates, and that nothing would exist if it didn't vibrate. For starters is this correct, or have I remembered incorrectly? Also, what is he talking about? Someone has...

One question related to Newton's third law, v t p u o u o It is a rope with a wheel,v. If 50N is applied from u pulling towards the ground, what's...

Yesterday, one of my cousins asked me about Newton's third law. In this discussion he asked me this question: Why does not a bullet bounce back after striking the surface of glass as it does in the case of steel, considering that in both the cases the force with which it strikes the glass or...

Why we move foward: The applied force from our foot pushs on the Earth and therefore, according to Newton's 3rd law, the Earth pushes back on me to make me move foward. Yeah, this is like basic material, but just need a verification, is this correct?

Newton's third law states something along the lines of "For every action, there is an equal and opposite reaction." The problem I have is that I don't understand how it stays true for something as simple as pushing a box. If a push the box (action), how can it be giving an equal opposite...

If there was a block on a table what would be the normal force between the block and the table. If you could describe the free body diagram that would be great too.

When object A and object B collide, where A is moving and B is stationary and where B seems to compress: Does B expand in response because a pre-existing internal force exists in B and exerts an equal and opposite reaction, or Is the entity motion transferred from A to B redirected back...

PLEASE help! Kepler's third law for electrical orbits Hi there! I hope someone can help me with this problem. I've been working on this for over 5 hours and I've gotten nowhere! :eek: A positron is a particle with the same mass as an electron but with a positive charge. A positron and an...

I can not find the answer for this In a rotating frame of reference, Newton's first and second laws remain valid if we assume that a fictitious force equal to mv^2/r is acting. What effect does this assumption have on the validity of Newton's 3rd law?

hi, Before i begin i am not sure where to put this post wether here or in the general section. Is Newtons 3rd law broken? Neutrinos don't follow this rule. the neutrinos can just pass through particles. so don't they break the 3rd rule? :confused:

Although the equal and opposite forces stated in Newton's third law are sometimes referred to as an action-reaction pair in reality they do not share a cause and effect relationship. They arise simultaneously, abide together and disappear simultaneously. Imagine you are spinning a washer...

hi...my teacher has offered an optional project of creating something that used Newton's third law.. I've been trying to think of something but i don't have any ideas... i have to make something .. and umm it can't be a fan on wheel blowing against a wall because that's the example in the book...

can someone explain to me Newton's thrid law of motion?

I'm not good at this stuff, so I need some help from some smarter people...:smile: The speed of the Sun in its orbit about the Galactic center is 220 km/sec. Its distance from the center is 8500 pc. Assuming that the Sun's orbit is circular, calculate the mass of the Galaxy (in solar...

How did Kepler come about to conclude that his third law is Radius3/Period2? How did he derive this equation?

Hi, I just got my physics test back and am hoping I can be helped with two questions. My instructor gave it back at the end of class leaving no time for going over it. 1) Suppose the period of the moon in its orbit about the Earth were 41.1 days and the moon were 768,000 km from earth...

Hello! I've just begun attempting to teach myself physics, and I'm finding it difficult to understand Newton's third law. Would someone be so kind as to shed a little light on the situation? The idea of the equal and opposite reaction for every action makes perfect sense to me in some...

I have attached a drawing that depicts the situation of two electromagetic coils in space separated by a vast distance. It seems to me that in this case there would be a magnetic action force on the right coil but no reaction on the left coil. I'm probably missing something here but I would...