174 Answered Questions for the topic Forces

Forces Physics Friction

08/03/19

What role does static friction force play for a rolling object? How can I know what direction it points?
Fundamentally, what does a friction force do for a rolling object? I am very confused by the way my textbook explains it. In my textbook , it says: A wheel rolling on a horizontal flat surface at... more
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08/03/19

Why shouldn't gravity be a force?
Why shouldn't gravity be a force? I am interested to know the reasons why we shouldn't treat gravity as a force in, for example, General Relativity. Won't we be able to model it accurately by... more
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08/03/19

Why is less force required to open a door when we apply a force at a greater distance from the hinge?
I know that the magnitude of a torque increases with the distance from the axis of rotation. What is the reason of that : how can a force exert a greater torque when the force is applied at a... more
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08/03/19

What's the core difference between the electric and magnetic forces?
I require only a simple answer. One sentence is enough... (It's for high school physics)
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08/03/19

What physical forces pull/press water upwards in vegetation?
Each spring enormous amounts of water rise up in trees and other vegetation. What causes this stream upwards? Edit: I was under the impression that capillary action is a key factor: the original... more
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08/02/19

Understanding tension?
I'm trying to understand tension. So here it goes: I'll start from the beginning. Let's assume I'm in space and can move around and apply forces. Let's say a rope is attached to a body(which is... more
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08/02/19

Small car colliding with large truck?
A small car collides with a large truck. Why do both vehicles experience the same magnitude of force? Wouldn't the large vehicle experience less force than the small one?
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Forces Physics Water

08/02/19

When displacement isn't possible?
Stop me if i'm wrong but displacement is, for example, when you enter a bathtub the water level rises around you. What happens when displacement isnt possible? I'll give an example. I have two... more
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08/02/19

Why can't charged objects exert electrostatic forces on heavier objects?
We know that, for example, amber rubbed with fur attracts bits and pieces of straw, paper, Styrofoam, etc. which are all light objects. Why don't they attract heavier objects, likewise?
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08/02/19

When a ball is tossed straight up, does it experience momentary equilibrium at top of its path?
This question has been asked many times all over the Internet and answers can be found on places such as yahoo and ask.com, but I'm not satisfied with those answers and I don't trust the validity... more
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08/02/19

Why do we take small steps while walking on ice?
> When we walk on ice we should take small steps. Small steps ensure: > > a.)larger friction. > > b.)small friction. > > c.)larger normal force. > > d.)smaller... more
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08/02/19

Which is easier, pushing or pulling?
It is generally assumed, from a person's perspective, that pushing a cart is more easier than pulling one. But why? Is there any difference in terms of force required to achieve the same amount of... more
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08/02/19

Why don't we consider jerk in physics classes?
When I got more into physics, I started asking myself if just like acceleration represents the growth of speed, something else could also represent the growth of acceleration itself. And it came... more
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Forces Physics

08/01/19

What is force? How does a constant force output a nonconstant power?
For a constant force, P=Fv. I understand the mathematical derivation of this, but this seems to me, intuitively, to be nonsense. I feel that my discomfort with this comes from a fundamental... more
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08/01/19

Why is a book on a table not an example of Newton's third law?
My textbook explains Newton's Third Law like this: > If an object A exterts a force on object B, then object B exerts an equal but opposite force on object A It then says: > Newton's 3rd... more
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08/01/19

Why does Newton's third law exist even in non-inertial reference frames?
While reviewing Newton's laws of motion I came across the statement which says Newton's laws exist only in inertial reference frames except the third one. Why is it like that?
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07/31/19

Why does an unhinged body rotate about its centre of mass?
If a force is applied to a body which does not act through its centre of mass, it rotates about its centre of mass and not any other point. Why?
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07/31/19

What atomic forces are acting to resist me pushing an air filled bottle underwater?
Yes air is less dense than water but how does the bottle know to rise or indeed to move? It's not electromagnetism I think. Does this have a relation to gravitational forces? Is it to do with the... more
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Forces Physics Vectors

07/31/19

Where am I confused about force addition?
As far as my knowledge is concerned, a vector quantity should possess magnitude and direction & more over it should also obey the laws of vector addition. As we all know that the vector sum of... more
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07/31/19

What is the basic reason behind buoyancy?
Yesterday my friends and I were solving this easy-looking question: > A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in... more
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07/31/19

Torque direction meaning?
I apologize if this question is dumb, but I've looked all over for a straightforward answer and either I can't find one or the terms are too complex for me to understand. I have only a rudimentary... more
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07/31/19

Work done by the Magnetic Force?
The magnetic part of the Lorentz force acts perpendicular to the charge's velocity, and consequently does zero work on it. Can we extrapolate this statement to say that such a nature of the force... more
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07/31/19

What keeps electrons in an atom from flying away or falling into the nucleus?
In atoms, what force or charge, etc. keeps electrons from flying away or into their nucleus? is there a kind of weak-force at work on the atomic scale? Note I am aware the electron positions are... more
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07/30/19

Why does a car engine not do work if the wheels don't slip?
I saw this mind boggling result that if the tires don't slip then the work done by an engine to move a car is zero. Why is this true? Moreover, what does this truly mean? **Update:** Sorry about... more
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07/30/19

When is tension constant in a rope?
Suppose we have a massless rope with pulling forces applied at each end. In which scenarios is the tension in the rope constant throughout? For example if there is a knot in the rope the tension is... more
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