Questions tagged [displacement]

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• 13
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Which distance will the rocket fall at? [closed]

The first rocket in the world had a mass of 2 kg (without the charge). When the charge bursted, 200 g of explosive gases were thrown out at the speed of 600 meters per second. Which distance will the ...
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Mechanics queries

Why the work done by internal forces is independent of frame of reference? Since the work done by a body is the dot of force and displacement and displacement is a frame dependent quantity, then how ...
• 31
1 vote
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Clarification on the displacement in the definition of Work

I'd like to ask a question about work. The definition of work gives us a way to calculate the work done by a force along a path but in practice it's not always clear what path to take in consideration....
• 155
34 views

Angular displacment and "normal" displacment of a minutes hand in a clock/watch

Note : i'm using "normal" because i'm not really sure what is its correct name, i suppose linear is more correct. as a backstory, we were solving questions in today's class and this came up (...
1 vote
123 views

Is the energy formula 'force multiplied by displacement' ($E=W=Fs$) correct? Why? [closed]

Is there a reason that the definition of energy is work, and work is defined as force multiplied by displacement ($E=W=Fs$)? It seems to me a strange formula. 'Momentum' is what puts a motionless mass ...
62 views

Different equation is given for "position"

$$s=ut+\frac{1}{2}at^2$$ Assuming, $u=0$ $$s=\frac{1}{2}at^2$$ $$a=\frac{2s}{t^2}$$ So I got a function for acceleration. $$v=u+at$$ $$v=\frac{2s}{t} \tag{1}$$ In reality I know that $s=vt$ when ...
• 91
75 views

Paradox in the Kinematic Equations of Motion

The 5 equations of motion have been chosen such that from the 5 variables of motion: $s$, $u$, $v$, $a$ and $t$; each equation, exclusively omits one of these. This allows us to only ever require the ...
• 119
37 views

Finding the angle that gives longest path for projectile motion using the average speed over the vertical displacement of object

For projectile motion, let's say a ball is launched at an angle a with respect to the horizontal, upwards. If I want to find an expression for the length of the path travelled by the ball before it ...
111 views

Why is there no work done by the wall on the person pushing it? [duplicate]

I revisited the basics of Physics and while studying work done, I came across the following question: You stand on roller skates facing a wall. You push against the wall and you move away. Discuss ...
• 103
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How to compute the Ocean tidal effect by giving the lat+long for specific location on a website?

I am quite new in this and interested in computation of contribution of the Ocean tidal gravity. I am following the website (http://massloading.net/ondemand_form.html) to get the data but I want to ...
• 1
1 vote
131 views

Why is position proportional to time squared?

Now I know some of the obvious answers to this, such as if you integrate the acceleration twice, you’ll get time squared, but what I’m really looking for is more of an intuitive answer. One of the ...
• 11
66 views

How can I calculate acceleration from displacement and time?

How can I calculate acceleration from displacement and time, assuming a velocity at rest? Is there any formula to do so?
• 103
124 views

How do acceleration, velocity, and displacement affect/relate to eachother?

I have been wondering this since learning about position, velocity, and acceleration vs time graphs but can't put numbers/equations to it. I know that acceleration acts to change velocity, shown by ...
• 169
38 views

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Why do we use $\frac12(v_f+v_i)$ in the kinematic equations?

I find it confusing that we have to use the average of the velocity instead of the final velocity. Can someone explain to me why $$s = \frac12(v_f+v_i)t$$ is true?
26 views

Spring system forces and displacement

I am trying to understand this system. A friend added to my confusion by stating the springs will not see all of Force B, they will only see all of Force B when the springs bottom out. To me, by ...
• 1
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What is definition of displacement in context to kinematics? [closed]

I want explanation of word particular here. The change in position of a body in a particular direction is called displacement.
Let's say I have a particle that goes from A to B, hits a wall at B with velocity $1.4 \mathrm{m}/\mathrm{s}$ and starts to go back to A with velocity $-1\mathrm{m}/\mathrm{s}$ starting from B. So ...