Newtonian mechanics covers the discussion of the movement of classical bodies under the influence of forces by making use of Newton’s three laws. For more general discussion of energy, momentum conservation etc., use classical-mechanics, for Newton’s description of gravity, use newtonian-gravity.

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Exerting force upon oneself in space

In space, there is no friction or forces of resistance of any kind, so I would assume that if two people were in space and one of them punched or pushed the other, the person upon which the force was ...
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1answer
29 views

Are perpendicular components special in vectors?

We can split a vector (velocity/displacement vector) along any two directions as long as the resultant of the oblique components of the vector is same as my original vector. Similarly if we have to ...
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1answer
33 views

What is the velocity of Sun due to earth alone?

If Earth and Sun were in a isolated system, will the Earth's motion around Sun will be similar? What will be Sun's and Earth's velocity when Earth is at its aphelion? Please note that it's not a ...
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0answers
26 views

Anomalous orbit of pluto [duplicate]

Can anyone explain, why, like unlike all planets, Pluto does not have a regular orbit? Why does it have an orbit that meets the orbit of Neptune? Why does it never collides with Neptune? Is it ...
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0answers
27 views

What is the work being done a girl carrying a bag walking down the street? [on hold]

What is the work being done a girl carrying a bag walking down the street?
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1answer
30 views

Spinning rubber ball with equatorial ridge

I have this rubber ball with something like a very slight equatorial ridge (sort of like Saturn's moon Iapetus) which I often spin around on my desk. I keep noticing that no matter the inclination of ...
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3answers
64 views

Derivative of kinetic energy [on hold]

I read that the derivative of kinetic energy=$F\cdot v$. I tried to differentiate (1/2) mv^2 with respect to time but each time I am getting $m*v$ and not $m*a*v$ which solves to $F*v$. My efforts are ...
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1answer
55 views

Help understanding work

I have this problem: An object with 800kg mass is lifted up 2.4m by a force $F$. How much work does the Force do on the object (gravity is the only other force acting on the object)? From what ...
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3answers
80 views

Why does a change of direction imply an acceleration?

We know that it takes no energy to change the direction of a vector, we know also that it takes no energy to displace a body in motion if a push is applied exactly at a right angle on its center of ...
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1answer
31 views

Calculating time and speed change on downhill incline

I am trying to calculate the time and final speed if lets say a bike with constant speed of 20km/h of goes in this incline (downhill), what would be its speed after say $M$ meter ? I remember the ...
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1answer
26 views

Mechanics Problem: The Acceleration of A Slider [on hold]

The acceleration of a slider A is defined by the relation $a = -2k\sqrt{k^{2}-v^{2}}$ where $k$ is a constant. The system starts at time $t=0$ with $x=0.5$ m and $v=0$. Knowing that $x=0.4$ m when ...
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1answer
47 views

Can I convert Power to Force?

I just realized that I have some issues with physics: I cannot just convert Power to Force (different units), $P = F * v$. But am I not able to calculate the force on a car that accelerates with a ...
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1answer
34 views

Why is work done $F$ applied over a distance energy? [on hold]

Why is $E=(1/2)mv^2$ named energy? It doesn't seem intuitive to me to call it such.
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2answers
99 views

Does an orbiting body accelerate?

Wikipedia says that : "Transverse acceleration (perpendicular to velocity) causes change in direction. If it is constant in magnitude and changing in direction with the velocity, we get a ...
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2answers
160 views

Conceptual rolling

If you could roll a ball down a slope with friction, we would all know which direction the ball is rolling. However, say we have a frictionless slope and we roll the ball in the opposite direction and ...
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0answers
44 views

How much wind power is needed to lift someone up? [duplicate]

I'm talking about fan wind power. A range would be sensible from about 8yrs-50yrs as not all human beings are the same weight with the added weight of a 5kg engine and average skateboard.
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1answer
42 views

Newton's laws in non inertial frame

Suppose we take a two particle system in CM frame such that the particles are connected by a massless spring and a force $F$ is applied on one particle ($m_1$ and $m_2$. Let $F$ acting on $m_2$). Now ...
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1answer
45 views

Damping a spring force

I'm modelling particles in a system using a spring and damper force. $$F= kx -cv$$ $x=x_i -x_f$, where $x_i$=centre of spring and $x_f$= displaced position. Above $x$ is the displacement and $v$ is ...
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0answers
44 views

Can one verify the Earth tide in his yard?

The ocean tide you can see on the coast. But the Earth tide beneath our feet is hardly perceivable. Is there any way to verify it in one's yard?
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1answer
22 views

How do I incoporate gyro information in my position and velocity calculation? [on hold]

The velocity in 1 direction can be calculated as : $V_t=V_0+at$ And position could be calculated as $P_t=V_0t+1/2at^2$. Besides time, acceleration, I was also given information from 3 axis ...
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0answers
25 views

Calculating center of mass after movement [on hold]

For this problem there is no change in External Forces so change in momentum to the system is 0. We have a massless boat of length $L$ with a person on either end of masses $m_1$ and $m_2$ Person 1 ...
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0answers
17 views

Bead and Disc with a String [on hold]

I want to know about the path the bead follows, and whether tension increases , decreases or remains constant and work done by tension (along with analysis and reasoning).
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3answers
101 views

How can i prove that $\frac{d\vec{p}}{dt} = \vec{F_{net}}$? [duplicate]

I could prove that $d\vec{p}/dt = m\vec{a}$, but how can I prove that $\vec{F_{net}}=d\vec{p}/dt$? Is force just defined by this expression? What is the rigorous definition of a general force? In my ...
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0answers
22 views

Problem on Conservation of Energy in Pulley System [on hold]

See the masses in Figure (1) which start out at rest. (i) Find the velocity of the 14 kg mass just before it hits the ground. (ii) Find the maximum height reached by the 8 kg (and don’t ...
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1answer
64 views

Hooke's Law Problem [on hold]

This question assumes that the spring obeys Hooke's law. Say we have a spring Length $L$. The energy of said spring when extended will be $E=(kx^2)/2$. The extension $x_1$ of said string would be ...
1
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1answer
32 views

Particle hitting particles attached with springs [on hold]

In classical mechanics if you have a particle moving in two dimensions and it hits a particle at rest although that particle is attached to a spring that is in turn attached to a third particle. ...
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2answers
66 views

Advantages of a deadblow hammer?

A deadblow hammer is a type of mallet with a hollow head filled with shot or sand. When you hit with it, say on an anvil, the mallet does not rebound, but just falls flat and heavy. I don't ...
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1answer
43 views

How to calculate distance travelled while car is rolling, given start and end speed?

I'm trying to calculate the distance travelled by my Formula Student racecar if it starts at a certain speed, goes into Neutral (no acceleration, no brakes, just rolling on its wheels), and ends at ...
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0answers
9 views

How is the inertia tensor (just diagonal elements) of a quarter disk related to the full disk one?

Let be a disk of radius $R$ and mass $M$ with an uniform distribution of mass $\sigma$, centered in the origin O, laying in the $OXY$ plane. If I know that $$I_x=I_y=\frac{1}{4}MR^2, \qquad ...
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2answers
30 views

Does atmospheric pressure have a net contribution to this FBD (free body diagram)?

Pressure acting on the left and right sides of the block counteract
1
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3answers
88 views

Why dont we consider force exerted by atmospheric pressure in mechanics?

My school has started teaching fluid mechanics, and it really bugs me why we don't consider force exerted by atmospheric pressure in mechanics. I couldn't understand a word my teacher said. There is ...
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0answers
16 views

To find the acceleration with which ring starts moving if the system is released from rest in terms of initial angle Ө? [closed]

Should I first take acceleration of ring as "a" and take acceleration of block as "a cosӨ" (as shown in the figure) or the other way round(i.e. acceleration of block as "a" and that of ring as "a ...
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0answers
32 views

How Newton's third law is involved in a tug of war? [duplicate]

Using Newton's third law, we can say that each team applies the same force on the opposite team. Then how one wins? Is it due to ground friction?
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2answers
85 views

Generalization of torque and angular momentum

Question: in the simple equations $\tau = r \times f$ and $L = r \times p$, what is the origin of the vector $r$? In many textbook discussions on rotation of a rigid body about a fixed axis, $r$ is ...
3
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2answers
97 views

“Suicide Burn” rocket problem [on hold]

THIS IS NOT HOMEWORK. I'm actually in Physics I atm, and am an avid player of Kerbal Space Program. I hope to do my CS masters thesis several years from now on something space related. But none of ...
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1answer
73 views

Why Aristotle made mistake about motions law? [closed]

Hi I was studying Aristotle motions law and comparing them with Newton. He states that heavier body fall faster than slow ones. I really can't understand how he could committed such a mistake...I mean ...
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1answer
41 views

A question on Newton`s laws of motion [closed]

Question: Let there be a monkey $B$ which is holding on to tail of the monkey $A$ which itself is climbing up a rope. The masses of monkey $A$ and monkey $B$ are $M$ and $m$ respectively.If $A$ can ...
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1answer
31 views

Vector representation of angular quantities?

In the world of pure rotation, a vector defines an axis of rotation, not a direction in which something moves. Does it means that angular quantities like angular momentum, angular speed, torque etc ...
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0answers
37 views

question regarding work energy theorem [closed]

The question says A smooth track in the for of a quarter circle of radius 6 lies in the vertical plane. A ring of weight 4N moves from $P_1$ to $P_2$ under forces $F_1$,$F_2$ and $F_3$. $F_1$ is ...
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0answers
27 views

What is a general equation for relating the forces of gravity to the object's acceleration? [closed]

For a program I'm writing, I need to know a general equation that calculates two objects' total acceleration given a number of factors, namely gravity. For gravity only, what is this equation? I know ...
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0answers
16 views

Transforming impulse formula [closed]

I'm in 11th grade high school and I really need some help with a physics assignment. Samarium decays into Neodymium and α: $$ {}^{147}_{\ \ 62}\mathrm{Sm} \to {}^{143}_{\ \ 60}\mathrm{Nd} + α (2.1 ...
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1answer
31 views

How much does air resistance affect the angular velocity of a golf ball?

I'm modeling the flight trajectory of a golf ball, and using angular velocity to calculate the Magnus force. Currently, I'm assuming angular velocity to be fixed throughout the ball's flight. How ...
3
votes
1answer
146 views

Feynman Lectures: Why a non-reversible weight lifting machine cannot lift higher that a reversible one?

Consider weight-lifting machines—machines which have the property that they lift one weight by lowering another. Let us also make a hypothesis: that there is no such thing as perpetual motion ...
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5answers
170 views

Why does solving $\mu mg = m \frac{v^2}{r}$ give the *max* possible velocity?

So here is the standard problem setup of a car turning on an unbanked road: A 1000 kg car is going around a curve with radius 30 meters. If the coefficient of friction between the car's tires ...
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0answers
22 views

Initial velocity of the bullet [closed]

a block of wood of 5 kg is suspended by a thread. A gun is fired in the horizontal direction and the bullet strikes the block and is embedded in it. as a result the block is raised 15 cm. If the ...
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2answers
32 views

Find the force needed to accelerate body to a certain velocity for a certain time with respect to drag force

So, the problem is straightworward when we suggest that air resistance force is constant: $$ \vec F = \frac {\vec V_1 - \vec V_0} {t} m / b $$ $$ \vec V_0, \vec V_1 - \text {initial and final ...
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2answers
29 views

Equation for vibrating cantilever in SHM

what is the equation connecting the period of oscillation of a ruler/cantilever with its length? my relation indicates that $T\propto L^2$ but i dont know if it is good
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1answer
32 views

Does a laser beam generate an equal and opposite force

If I hold a laser pointer and press the trigger does the emission of the beam generate kick-back in the opposite direction through conservation of momentum. I understand it would be tiny, so my ...
1
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1answer
44 views

Warship cannons influence on speed/direction [closed]

I've been looking at great warships like the Iowa or equivalent ww2 warships, and I raised question. This kind of war is pretty much only about strategic placements, accuracy and fire power. Hence ...