# Questions tagged [free-fall]

Free fall is any motion of a body where gravity is the only force acting upon it. In general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.

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### Is it easier to hit a ceiling of an elevator with a jump if the elevator is in the free fall?

In contrast to a popular question, here I want to hit a ceiling of an elevator. If the elevator is standing still, my legs are not strong enough to generate a jump that will help me hitting the ...
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### Accounting for air resistance in a free fall experiment

Suppose we are working with masses of equal density. The effect of air resistance is bigger on objects which have a larger surface area $A$ (perpendicular to $g$). In a free fall experiment, this ...
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### So I've found out heavier objects technically do fall faster? [duplicate]

Given the Earth's mass to be $M_E$, I know that $F_G = -\frac{GM_Em}{d^2}$, so the gravitation acceleration of a mass towards Earth is $g = -\frac{GM_E}{d^2}$. But what about the force exerted by the ...
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### Why free fall motion is parabolic?

Consider no air resistance. If we throw a ball vertically upward from my point of view it goes vertically up and down and moving along straight line. But from point of view observer in outer space it ...
1 vote
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### Ground force on free falling object [closed]

Let a body be falling freely from height $h$ to the ground. Can we express the reactionary force $F$ acting on the body from the ground as a function of $h$, i.e. $F=F(h)$? (My attempt contains also ...
1 vote
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### Defining Free Fall: Does Gravity Need to be the Sole Force Present?

Can a scenario be considered free fall in physics if the work done by forces other than gravity is zero, but those forces are still present? Or is it necessary for gravity to be the only force present ...
1k views

### What does it mean that a falling mass in space doesn't sense any force?

I heard someone explain that if you were falling in space (i.e, a rooftop) you wouldn't sense gravity as a force acting upon you. But it would accelerate (≈ 9.8 m/s^2) , which to me suggest that a ...
34 views

### Differential equation of an object dropped from certain height

I want to solve this problem - A ball of mass 2kg is dropped from a tall building with zero initial velocity. In addition to gravity, the ball experience a damping force of the form -2v, where v is ...
87 views

### Is the sensation of falling purely due to air resistance?

When I jump off of something, even with eyes closed I can be pretty certain that I'm falling due to the associated sensation of falling. However, as gravity should be affecting each of my internal ...
1 vote
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### How does unbalanced force ever create? [duplicate]

This question rather seems elementary but has been bugging me for a while! How does even unbalanced forces create? The main driving force of this question is Newton's third law Let's take Free Fall: ...
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### Ways of losing energy of a bouncing objects in vacuum other than Heat and Sound

When we released a bouncing object in a vacuum chamber, the object will fall, contact the ground of the chamber and bounce back up. We know that the object will not return to its original height ...
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### Why won't a pen work on the International Space Station?

Today, in my physics class, we were discussing the effect of microgravity (specifically on the ISS) on various objects of everyday value. I learnt that a normal pen wouldn't work in space (So they ...
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### Derivation of Proper Time of Fall in Schwarzschild Metric

Some time ago, in this question (Proper Time of Fall in Schwarschild Metric), I asked how to find the proper time of fall of an observer in the Schwarzschild metric because I had found many different ...
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### Distance from Earth as a function of time [duplicate]

I'm trying to work on a problem involving modelling the distance of an object from Earth as a function of time (acknowledging that gravity changes with distance). This involves solving the ...
1 vote
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### Does weightlessness make no difference to free fall?

I looked up a lot of articles and questions about free fall motion and weightlessness. And I know there are a lot of similar questions. In conclusion, I understand that there is no way to distinguish ...
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### How does instantaneous velocity cause displacement in just one point? [closed]

I have a question. Falling object graph is curve shape right? And instantaneous velocity is tangent line but how does this velocity make displacement in distance? Because suppose instantaneous ...
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### What is weightlessness? [duplicate]

I am having trouble understanding weightlessness in free fall. Why does person feel no force acting on him or her? For example, I feel when car is accelerating horizontally at 1g. Is it just the seat ...
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### If a ball experiences a force when it hits the ground, why can we still use the kinematic equations to solve for its freefall time?

Suppose a question states: A ball is dropped from a height of 2m. Find the time it takes for which the ball is in free fall. To solve this, we would plug in our known values into the kinematic ...
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### Frame of reference of a freely falling observer in General Relativity

Suppose I have an Einstein manifold (a manifold with a metric that solves the Einstein field equations. We can take $\Lambda = 0$ for simplicity in this example). The worldline of a freely falling ...
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### Can a gravity-compensated accelerometer still measure or detect free-fall?

Take the simplest example of a plane aligned perfectly to the NED inertial reference frame at all time. The plane is restricted to only thrust or elevate upward or down with zero pitch, yaw, and roll (...
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### Equation for position and velocity of a body falling in a gravitational field [duplicate]

I have tried asking this question on many forums and have so far failed to get a clear answer. Here is the problem. A body with a negligible mass is falling from a distance $R_1$ in a gravitational ...
1 vote
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### Why is it proclaimed for astronauts to be "falling"?

My physics teacher explained that the reason why it looks like astronauts are floating is because they are "falling". However, the way I think of it is that the outwards inertial force of ...
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### If you drop a coin inside a car that is slowing down, where will the coin fall?

If you drop a coin inside a car that is deccelerating, where will the coin fall with respect to the vertical where you dropped it? My thoughts where since it still has a velocity forwards, even ... 38 views

### Why an object with uneven distributed mass revolves when dropped from a height? [duplicate]

I was dropping a lego figure with its hands up and observed that it rotated when falling, it tried to drop in a position where its head was closer to the ground. About this I did think that it might ...
37 views