Questions tagged [free-fall]

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3answers
52 views

Does the object have acceleration in the tangential direction of the path?

Objects thrown horizontally fall freely along the path of the parabola. Does the object have acceleration in the tangential direction of the path? I think it is, but someone told me it was not. He ...
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Bernoulli equation under free fall in inertial frame

If a cup of water with a hole on the side of the cup, then there would be water streams out through the hole. And it could be calculated by using Bernoulli's law. However, if the cup with water and ...
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3answers
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Would lifting dumbbell in free falling lift be easier or harder?

Would it be harder to lift a dumb bell in free falling lift, where the dumbbell is falling with us or would it be easier?
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1answer
29 views

Calculating the distance crossed by a ball under changing gravitational acceleration [duplicate]

Suppose a ball of finite mass is taken to such a height in space that the gravitational acceleration decreases significantly. Now, as you let go of the ball, it should head straight down towards the ...
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2answers
67 views

If two identical balls were dropped from the same height, but one of them was given a push to the side also, which would hit the ground first and why? [duplicate]

I was wondering if two identical balls were dropped from say, 10 meters, but one of them was given a push to the side whilst dropped, which would hit the ground first and why? Would the ball that was ...
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8answers
827 views

What's wrong in stating that equal gravitational forces act on two identical masses at different heights, as they have the same acceleration $g$?

This might be stupid but I need an answer. Newton's second law stated that the force exerted on a body equals the mass of the body times the acceleration of the body. And the law of gravitation ...
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3answers
121 views

Can Bob be in the same reference frame as Alice while freefalling in gravitational fields of different strengths

Alice and bob, while in a common inertial reference frame, synchronize watches so that they tick at the same rate. Alice moves to an altitude X above a large point mass and maintains her altitude by ...
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2answers
42 views

Neutral buoyancy and free fall

Is an object that is neutral buoyant the equivalent of the same object in the microgravity (free fall) of the International Space Station? If a pingpong ball floating on top of still water in a basin ...
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6answers
243 views

Are satellites doing free fall?

I was told that satellites are doing free-fall. But I don't think so, I think, assuming that the satellite is moving at a constant speed in a circular motion, the satellite does not do free-fall ...
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7answers
2k views

Cause of weightlessness [duplicate]

I'm a first year engineering student who is new to physics, so I apologize if my question is stupid. But in our statics course we are using the book "Engineering mechanics: statics" by R.C. Hibbeler ...
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1answer
28 views

Can accelerating spaceship somersault in space?

I was watching a space shuttle performing a pitch manuver in free fall, then I imagine a spaceship travelling with a constant acceleration in space trying to perform pitch manuver is it possible while ...
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1answer
61 views

Strain in a freely falling body

I wanted to know if there would be any extension in a freely falling body due to gravity . I know that a rod tied to the ceiling at one end will show an extension $MgL/2AY$. But if the same rod is ...
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1answer
43 views

Free fall with added deceleration [duplicate]

My question is about free fall from an airplane. Lets say your seat detaches from the plane and you follow a standard free fall. $$v^2=v_0^2+2g\Delta x=\sqrt{0+2\cdot 9.8\,\mathrm{m/s^2}\cdot 10000\,\...
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1answer
73 views

Free fall and gravitational waves

If you take the Earth-Moon system, from what I understand, the Moon for instance is in free fall towards the Earth-Moon center of mass. However Einstein's equivalence principle says that a body in ...
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1answer
83 views

Is the radial two-body problem solvable?

Is the radial two-body problem solvable, i.e. does the differential equation $$r''(t) = 1/r(t)^2$$ have an analytic solution? If it does, what is the solution? And if not why does everyone say that ...
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5answers
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Einstein's quantum elevator in a vacuum

If Einstein was in an elevator in free-fall in a vacuum and in his upturned hand was a miniature elevator containing a miniature Einstein who had a miniature elevator in his hand and so on in ever ...
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0answers
37 views

Accuracy of power series solution of the one-dimensional two body problem

I regained interest in solving the one-dimensional two-body problem. It is that one wishes to determine the location of two point masses only under the influence of gravity. I assumed that neither ...
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1answer
49 views

Prove that the height swept by the ball in the last second is $5 m/s$ [closed]

I was studying kinematics and came across the following observation: every ball thrown upward with a speed greater than or equal to $ 10m/s $ will travel 5m in the last second of movement to maximum ...
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1answer
104 views

Proper Time for Free Fall into a Schwarschild Black Hole [closed]

In the solution to the question here, they define the proper time for free fall into a Schwarschild black hole as $$ \Delta \tau=(2 / 3) r_{s}\left(r / r_{s}\right)^{3 / 2} $$ but they don't provide ...
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2answers
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What would happen to our sense of gravity if there was a massive object near Earth?

What would gravity feel like at different points on Earth if there was a super massive object near Earth? I know it would depend on the mass of the object, but what I'm wondering is could there be a ...
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3answers
117 views

Photon and free fall

I have questions in 2 scenarios regarding this. Lets say according to an observer P at rest with respect to the earth, me & my friend start at the same time & at the same height to free fall ...
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1answer
671 views

What would happen if you drop two objects of the same shape and size but different mass in Earth's atmosphere?

The question of letting two objects fall in vacuum and the effects on gravity is discussed on this site including questions like the gravitational pull of the objects towards each other, the Earth's ...
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0answers
33 views

Acceleration of a falling object as it hits the ground

I am pretty new to physics so forgive me if this seems like a really dumb question. My Physics I teacher is having us develop a solution to the question: You drop your laptop; what is its ...
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1answer
44 views

Measuring acceleration due to gravity in the lab

I am measuring the acceleration due to gravity in the lab with an electromagnet apparatus. My textbook says to take the average time for a number of falls (keeping the height constant of course). ...
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1answer
64 views

Free-falling elevator and jump at the last second: 2 different arguments, are they flawed?

There's a particular myth regarding an elevator and a person in it that goes like this: If a person is in a free-falling dive in an elevator (say the steel wires have broken and the emergency ...
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4answers
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How is linear momentum conserved in case of a freely falling body?

When an object is experiencing free fall, it has a constant acceleration and hence an increasing velocity (neglecting friction). Thus its momentum is increasing. But according to law of conservation ...
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2answers
69 views

Technical question on definition of free fall

Free fall is any motion of a body where gravity is the only acceleration acting upon it. But, what if I threw an object from a certain altitude, and had two jetpacks put on it , one providing ...
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1answer
34 views

Forces acting on an object about to hit the ground

I have a simple question, If I have a spanner or (any object) and I drop it. As it's just about to make contact with the ground what would the main forces acting on it be?
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1answer
52 views

What will be trajectory of a free falling rotating fan?

Consider a situation, where a fan is rotating in full swing. Suddenly, the contact between ceiling and fan bearing is broken. What will be trajectory of fan if it falls under the infulence of ...
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1answer
21 views

Freefall equations and forces

Consider a scenario where a 100kg mass is hanging from a rope. It's stationary, so the force it exerts on the rope is given by $F=ma$, where $a$ is the acceleration due to gravity, which works out to ...
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3answers
90 views

Why bodies with different masses reach gound at the same time in vacuum? [duplicate]

According to Newton's Gravitation Equation $$F=G \dfrac{M\cdot m}{r^2}$$ force of gravity depends upon mass of both objects, and $$F=ma$$ means force is proportional to acceleration. Then why do ...
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5answers
360 views

What determines the “strength of impact” of a falling object on the ground, momentum or energy?

I am considering free falling objects that eventually hit the ground. The objects have various masses and various final (ground-impact) velocities. What should I measure the "strength of impact" ...
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2answers
164 views

Would a fluid in free-fall exert a buoyant force on an object submerged in it

I’m not sure I 100% understand the buoyant force on the atomic scale. I know the force is due to pressure exerted on the object, due to the volume of the fluid that the object displaces. I’m under the ...
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6answers
269 views

What is the reason for Moon and satellite in free fall condition? [duplicate]

I am a high school student. I read in my book that moon and satellite are in free fall condition with Earth. I asked my teachers about this, but I'm not able to understand. Can anyone explain to me ...
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1answer
140 views

Maximum Vertical Velocity of Pendulum

Say there is a 10N pendulum held parallel to the ground. In a frictionless environment, it will continue swinging along a semicircular path. The pendulum tip should have the highest horizontal ...
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1answer
120 views

Use of direction of downward velocity in equation of motion

[NOTE: I am not asking anyone to solve the question below but to point out where I might be wrong] Q- A skier jumps from a horizontal track and lands on a steeper track with a launch angle of ∅=11.3°(...
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1answer
76 views

Falling towards a black hole in a box

I've been studying General Relativity on a friend's notes. There's an exercise I can't quite grasp. An observer is located in a closed, windowless box. The box is falling radially towards a black ...
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5answers
8k views

Is floating in space similar to falling under gravity?

In the case there is no air and your eye are closed, then does falling from the sky under gravity have the same feeling as floating in space? Can our body feel that we are accelerating without the ...
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1answer
69 views

Horizontal Free Fall

Let's say you are launched out of a canon at a $0^\circ$ degree angle 5 feet off of the ground. Normally, from my basic understanding of free falling, you have to be move unimpeded with no force ...
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3answers
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Life physics: falling objects

I've started wondering for a while WHY we experience so much damage when we hit a ground after a free fall? What forces are responsible for that? After some thinking I concluded that it has to do ...
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2answers
41 views

Would a puddle of spill milk on the elevator floor float when I cut the cable?

Imagine I pour some milk inside the elevator and then I cut the cable to allow the elevator to free fall, does it immediately float or only when the elevator speed has reached 9.81m/s/s? Oh and assume ...
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1answer
50 views

Is a body in passing gravitational wave still in free fall?

I have a simple apparatus: a box and inside it a test particle (small bullet). If the device is in inertial motion or affected only but (static) gravitational field of another massive body (in free ...
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1answer
658 views

The phase space trajectory of a single particle falling freely from height is? [closed]

The phase space trajectory of a single particle falling freely from height is? Phase space is a plot between momentum and position, and since kinetic energy increases the momentum must increase with ...
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2answers
269 views

How do you find the minimum height to open a parachute for a safe landing?

What concepts/formulas can be used to find the optimum/minimum release height of a parachute?
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0answers
57 views

Closed-Form Equation for a Free Fall [duplicate]

My eighth-grade physics teacher taught us that the equation for height ($h$) during a free fall in a vacuum is equal to the initial height ($H_0$) minus a constant ($G$, though not the $9.8$ meters ...
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1answer
13 views

Can't find coefficient for my IVP

In my problem I have to set up an IVP and model freefall with air resistance before the bungee starts being pulled on. Beta being my airresistance coefficient. I have: $$ mx'' + \beta x' = f(t) = 0$$ ...
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2answers
50 views

Could a skydiver levitate?

A diver exits his plane and with decreasing acceleration, eventually reaches terminal V owing to Weight=Friction. Then he opens his chute, and friction>weight, so he decelerates (up). My question is, ...
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1answer
53 views

Which ball touches the ground first? Different explanations

Two balls with the same shape and volume but very different masses are dropped from the same height WITH air. The heavier ball should land first, but is it because of terminal velocity (see this ...
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2answers
3k views

Free fall ellipse or parabola?

Herbert Spencer somewhere says that the parabola of a ballistic object is actually a portion of an ellipse that is indistinguishable from a parabola--is that true? It would seem plausible since ...
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6answers
847 views

If an object with more mass experiences a greater gravitational force, why don't more massive objects fall faster? [duplicate]

According to Sir Isaac Newton, the gravity equation runs like this: $$ F = \frac{Gm_1m_2}{r^2} $$ where $F$ is the gravitational force, $G$ the gravitational constant, $m_1$ and $m_2$ are the ...

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