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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What factors are influencing a woosh rocket?

Not sure if this is too much chemistry, but I'll try: If I fill a plastic bottle with a small amount of rubbing alcohol, shake it around and hold a match to the bottle neck, I'll get a flame wooshing ...
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3answers
37 views

Calculate acceleration from power

I am currently programming a simple computer space ship simulation. This is just for fun to train my programming, 3D graphics and a little bit of physics skills. What I want is the user to pick a ...
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0answers
22 views

Moment line of action

I am having trouble understanding a moment's line of action. Lets say we have door hinge of $L$ length and push down on it with $X$ force. The moment at the begin $(O)$ of the hinge would then be ...
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0answers
17 views

Linear Momentum [on hold]

The linear momentum of a particle varies with time as follows P= a + bt2 . where a & b are constants . the net force acting on the particle is proportional to t & constant ?
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0answers
15 views

problems on power, force and velocity [on hold]

A car of 1200kg is moving along a horizontal road, the engine of the car is working at a constant power of 24kilowatts. The frictional resistant to motion has a magnitude of 400N. When the speed of ...
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1answer
36 views

Why does mechanical energy have to equal zero to find escape velocity?

A object orbiting the earth has total mechanical energy equal to \begin{align*} E^{mech} = \frac{1}{2} m v^2 - \frac{GMm}{r} \end{align*} with $M$ the mass of the earth and $r$ the distance. My course ...
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4answers
892 views

Does stopping the same bike and rider at the same velocity with the front brake require less energy than the back brake?

It's the same body made by the rider and the bike moving at the same speed. So, even though braking on the front/back alters the normal forces on the opposite wheels thus creating more friction with ...
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1answer
13 views

Effects of vertical circular motion to the body weight

Our body weight will experience the differences when moving at constant speed in a vertical circular motion such as roller coaster. Why do we feel heavier when at the bottom of the loop and lighter ...
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1answer
43 views

Changing linear to angular velocity

Suppose a 1m rod with a hook is travelling at v m/s, and the hook is caught on a hanging line. The rod will change its translational motion into rotation around the hook. Since it is not an elastic ...
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1answer
43 views

Why is the net work done in a pulley-string system zero?

In any pulley system, where the pulleys and strings are massless and frictionless, why is the net work done by Tension zero?
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0answers
28 views

Circular motion physics [on hold]

Two automobiles of equal mass approach an intersection. One vehicle is travelling with velocity 13.0m/s toward the east and the other is travelling north with speed V. The vehicles collide at the ...
-2
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1answer
21 views

Torque-direction of rotation

Taking moment about $A$, the mass of 2.0g and 0.50g is rotated in the clockwise direction is because they are both directed in downwards position? while $R2$ is acted in upward direction, so it is ...
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2answers
44 views

Can two artificial bodies be built in space and be made to orbit each other?

Would it be possible to make artificial constructs (satellites) orbit each other? I looked at the gravitational laws, and nothing seems to suggest that this is not possible.
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2answers
34 views

Can the anti-torque of a motor be used to spin a space vehicle about it's axis?

Imagine a huge electric motor together with it's power supply in space. What exactly will happen to it if it is suddenly powered, won't it spin about it's axis or it will experience no relative motion ...
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0answers
18 views

Projectile - air drag problem! [on hold]

I know it's not a homework help site, but still, I apace proceeded in this problem, but cannot go further. A body of mass m us thrown at an angle $\alpha $ to the horizontal plane with an ...
0
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0answers
32 views

How do we deal with air resistance? [on hold]

Suppose a body of mass $m$ is projected and given that the air resistance is $kv$, where $v$ is the instantaneous velocity. I need to find the maximum height. I could do it given that the air ...
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1answer
34 views

Are coefficients of friction invariant by switching the materials?

I don't have the ability to make the experiment to answer these questions : Let $A$ and $B$ be two materials. Is the static coefficient of friction of $A$ on $B$ equal to the static coefficient of ...
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0answers
8 views

How to calculate the inertia tensors of an irregular polygonal right prism?

I am attempting to program a physics simulation and need to do calculate the inertia tensors of a mesh constructed of a series of irregular polygonal prisms. Now, I am aware that you can calculate ...
9
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2answers
2k views

Can a mouse rotating a wheel violate conservation of angular momentum?

I have been thinking on the following problem. Part I. Imagine we have a mouse enclosed in a rigid box. We placed the box on a frictionless surface (ice might be a good example). Can the box start ...
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0answers
58 views

Is it true that whenever any non rigid body moves, there must be a delay between the ends? [duplicate]

Very sorry if this is still considered a duplicate to this, but unfortunately the answer to this question cannot address this because mine is a nonrigid body and involve biological locomotion concepts ...
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1answer
30 views

Period to calculate the universal gravitational constant

To calculate the torsion constant in Cavendish experiment we need the period of it, so my question is if I need to measure the time the rod with two small spheres takes to do an oscillation (with an ...
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0answers
24 views

Throwing the object around the Earth [on hold]

You have to throw an object to a point diametrically opposite od Earth surface, take that Earth does not rotate and that it is perfect sphere. What angle to the ground and velocity must object have? ...
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0answers
45 views

Question about Elon Musk's Hyperloop Suspension [on hold]

So one of the proposed suspension systems that will be used on the hyperloop include the externally pressurised air cushions. These cushions lift (or atleast help lift) the capsule and reduce drag ...
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1answer
36 views

Intersection of two moving objects [on hold]

There are two objects. The first object moves with speed $U_1$ from known point A to known point B. The second object has speed $U_2$ and starts from known point C. What is the direction the second ...
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0answers
25 views

newtonian-mechanics [on hold]

A 1000Kg helicopter hovers over a forest fire and starts to squirt water downward with a speed of 10m/s at the rate of 40Kg/s. What is the initial upward acceleration on the helicopter when it first ...
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0answers
9 views

Kinematic Motors in series to flywheel calculation problem [on hold]

Motor 1 drives a platform at 15 RPM clockwise steady state always 15 RPM. Call the axis of rotation Y. Motor 2 is mounted on this 15 RPM platform and axis aligned thus also Y axis (parallel Axis). A ...
2
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1answer
31 views

Is motion along the $x$ and $y$ axises independent with quadratic drag?

It's often stated that motion in the $x$ and $y$ axises are independent, so that changing the $x$-velocity will not influence changes in the $y$-velocity. To me it seems that with quadratic drag (drag ...
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2answers
76 views

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
59 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
62 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
28 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 ...
-1
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0answers
99 views

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

What is the work being done a girl carrying a bag walking down the street?
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1answer
44 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
77 views

Derivative of kinetic energy [closed]

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 ...
3
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1answer
59 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
88 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
35 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 [closed]

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
56 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? [closed]

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
103 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 ...
3
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2answers
161 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 ...
-2
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0answers
45 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.
0
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1answer
46 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 ...
2
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1answer
46 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
45 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?
0
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1answer
22 views

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

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 ...
1
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3answers
102 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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1answer
64 views

Hooke's Law Problem [closed]

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 [closed]

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. ...