174 Answered Questions for the topic Forces

07/30/19

Which force is responsible for victory in tug of war?
I'm confused: In a tug of war game on rough ground who will win? The one who applies greater force on the rope or the one who applies greater force on ground?
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07/30/19

Why don't black holes form from forces other than gravity?
Gravity is the weakest of the fundamental forces, so what is so special about gravity that it can form an inescapably strong field while a force like the EM force cannot? It seems to me that if... more
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07/30/19

Understanding the trajectory of a projectile?
It is stated that a projectile's motion can be divided into individual vectors. Now according to the laws of physics, the forces acting in the y-direction will never cancel or affect the force... more
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07/30/19

Why alpha particles inestead of hydrogen or duetereum?
I know atoms undergoing alpha decay emit alpha particles, but I was wondering why specifically helium nuclei? If these atoms wanted to emit the smallest unit of matter (I'm talking about hadrons... more
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07/30/19

Sandstone getting soaked with water?
I have seen someone putting a sandstone in water. With only about 10% of the stone sitting in the water. One could see the stone getting soaked with water. So there must be a force, which lets the... more
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07/30/19

Rope tension question?
If two ends of a rope are pulled with forces of equal magnitude and opposite direction, the tension at the center of the rope must be zero. True or false? The answer is false. I chose true though... more
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07/29/19

What is the cause of the normal force?
I've been wondering, what causes the normal force to exist? In class the teacher never actually explains it, he just says "It has to be there because something has to counter gravity." While I... more
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07/21/19

How are constraint forces represented in Lagrangian mechanics?
Suppose we try to obtain the movement equation for a particle sliding on a sphere (no friction, ideal bodies...). The only forces acting on the particle are its weight and - here's my problem - a... more
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07/21/19

Has a body angular momentum and torque only in a circular path?
In different contexts, my book(**Principles of Physics** by Resnick, Halliday ,Walker) , they wrote > For torque, the path need no longer be a circle and we must write the torque as a vector... more
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07/17/19

How can a bowling ball curve in both directions?
There is a popular video on facebook that I just don't understand. A man spins a bowling ball very fast then slightly taps it down the lane. Somehow it does half of a figure eight, curving around... more
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07/17/19

Does an athlete's proficiency at luge depend on his mass?
I was watching the men's [luge](http://en.wikipedia.org/wiki/Luge) ride with my dad. My dad said, the mass of the athlete must be at an optimum level so that he wins. I said, his volume should be... more
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07/17/19

Are the field lines the same as the trajectories of a particle with initial velocity zero?
Is it true that the field lines of an electric field are identical to the trajectories of a charged particle with initial velocity zero? If so, how can one prove it? The claim is from a german... more
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07/17/19

Ball flying towards me or me flying towards ball?
Suppose a ball is flying towards me at a speed of 10m/s and that, on impact, I feel "x" amount of pain. If, instead, it was me flying towards the ball at the same speed, with all other conditions... more
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07/17/19

Bidirectional jerk motion on a stopping vehicle?
A stopping vehicle (say a car) has an apparent retardation (which may/may not be constant in magnitude) when force via brakes is applied. I travel by subway trains, and I noticed an odd... more
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07/17/19

Does the mass of a star change as it collapses into a black hole?
I know (I think!) that when a really big star collapses on itself it creates a black hole. My question: When a star collapses, is the mass equal to the mass of the star when it's not a black hole?... more
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07/17/19

Do two springs compressed springs placed against each other obey Newton's third law?
I've been mulling over the following scenario. Say I take two springs whose force is given by some well-defined function of position (for example, Hooke's law F=kx will do). Using this law, I... more
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07/17/19

How could a cord withstand a force greater than its breaking strength?
How could a 100 N object be lowered from a roof using a cord with a breaking strength of 80 N without breaking the cord? My attempt to answer this question is that we could use a counter weight.... more
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07/17/19

Gravity - Force or Result?
I am no Physicist, but I enjoy reading about Physics. However reading about leading theories such as M-Theory and others they speculate about the existence of the Graviton. In my past reading of... more
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07/16/19

How do I describe and calculate the effect of an impacting object?
My lab studies the physiology of impact injury on biological tissues. I use a pneumatic cylinder to impart injury into a biological sample and then assess the molecular and physiological changes in... more
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07/15/19

Can a bullet shot through a glass make a clean hole?
One can often see (hopefully only in the movies) that a bullet shot through a pane of window glass leaves a hole in it, but overall the glass is left largely intact. However, a low-speed... more
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07/15/19

Are the Maxwell's equations enough to derive the law of Coulomb?
Are the 8 Maxwell's equations enough to derive the formula for the electromagnetic field created by a stationary point charge, which is the same as the [law of... more
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07/11/19

How can tangential acceleration from a radial force be explained?
A mass is attached to a rope, and put into a circular motion. If I pull the string from the center, the tangential speed of the mass will increase (by conservation of angular momentum). I am... more
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07/11/19

finding angular velocity and regular velocity when bouncing off a surface with friction?
Take the game of pong as a simple example. When you hit the ball with a paddle that has a frictional surface, the ball will spin as well as change direction according to the coefficient of kinetic... more
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07/11/19

Calculating electric motor's weight lifting ability knowing power. What else do I need to know?
So, my company works with electric motors, and my boss wanted me to calculate how much weight could be lifted by a motor rated at 750W. I know that I can't just calculate the work done by it... more
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07/11/19

Bounce of a ping pong ball vs bounce of other things (How does the material affect ?)?
Yesterday I saw that a ping pong ball bounced nicely on a hard surface but poorly on a mattress.On the contrary ,I saw that other things (a pen for example) bounced poorly on a hard surface but... more
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