All Questions
Tagged with definition forces
9
questions with no upvoted or accepted answers
2
votes
3
answers
159
views
Weight in Newtonian mechanics
What do we mean by the term weight? Is it an upward force exerted by an object to counteract the downward force of gravity (or) is it the downward force itself? Is the magnitude of the weight always ...
- 105
1
vote
1
answer
90
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Relation between Force and Potential in a relativistic context
In a relativistic context we define the four-force as, $$\frac{\mbox{d}}{\mbox{d}s}p=F$$ In the particle frame the four-force must have the form $$F=\left(0,\ \mathbf{f}\right)$$ As it must be ...
- 21
1
vote
1
answer
239
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How exactly IS Newton’s second law verified experimentally?
In R. Shankar’s “Fundamentals of Physics : Vol 1” while discussing Newton’s Second Law of Motion, Prof. Shankar raises the question : how do we know Newton is right? I quote from the book :
Take ...
- 11
0
votes
1
answer
250
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What is the difference between the applied, external force and the generalized force?
in analytical mechanics, we define the generalized force using the applied force times $dr/dq$. If I want to express the difference between the external and generalized force in words in order to ...
0
votes
3
answers
141
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Different definitions of the EMF of a device - None of them applies to devices in a circuit
Wikipedia gives two formal definitions of the electromotive force:
One in case of a closed loop, in which case the the EMF is supposed to be the path integral of the electric field (and all other ...
- 6,763
0
votes
0
answers
58
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Determining mass and force separately
I have been thinking.. How can we measure the mass of the body separately from the force? Or should we measure the force and acceleration? But by which means can we gauge our equipment e.g. some ...
- 1,803
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votes
1
answer
80
views
Work done by a force
What is the difference between work done by a force and work done against that force?
Is it true that work by a force = -(work against that force)?
user113344
-1
votes
2
answers
351
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Please explain work done
We have learnt that when an force displaces object along its direction then it is work done. so there is dot product in its formula (I guess). So is it also right to say that work done is cross ...
-1
votes
1
answer
152
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Is this a good description for potential energy?
The potential energy can be seen as the energy stored in a system that can be "expelled". An object at a height $h$ above its reference point has a potential energy given by $U_{gravitational} = mgh$.
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