How do you calculate free fall?

v f = g * t where g is the acceleration of gravity. The value for g on Earth is 9.8 m/s/s. The above equation can be used to calculate the velocity of the object after any given amount of time when dropped from rest.

How far is a 30 second free fall?

8,000 feet : About 30 seconds of freefall time. 13,000 feet: 45 to 60 seconds of freefall time. 15,000 feet: 60 to 70 seconds of freefall time.

What is the formula for freely falling body?

For a freely falling object, we have the free fall kinematics equations: v = v 0 − g t.

How far is a 7 second fall?

Table Time/Sec 0 7 Accel – m/sec 2 9.8 9.8 Velocity – m/sec 0.0 68.6 Distance – meters 0.0 240.1 Jul 21, 2022

Do heavier objects fall faster?

In a vacuum at the surface of the Earth, all objects fall at the same rate, under the constant acceleration of gravity, equal to 9.81/. Galileo's claim was correct, and in particular, Aristotle's claim that the rate of fall of an object was proportional to the weight was incorrect .

How far is 5 seconds of free fall?

Conclusion: The displacement of the object from its initial position or the distance travelled in 5 seconds is 122.5 m and in 6 seconds is 176.4 m.

How far will you fall with a 6 foot lanyard?

In this case, a 6-foot worker with a 6-foot lanyard would experience a total fall distance of 18.5 feet .

How far is 10 seconds of falling?

Using the figure of 56 m/s for the terminal velocity of a human, one finds that after 10 seconds he will have fallen 348 metres and attained 94% of terminal velocity, and after 12 seconds he will have fallen 455 metres and will have attained 97% of terminal velocity.

How far do you fall in 3 seconds?

Here acceleration is acceleration due to gravity g,g=9.8 m/s^2 and initial velocity is zero. S=1/2*9.8*9=44.1 meter. You will fall 44.1 meters in 3seconds.

How far do you fall in 2 seconds?

The first equation shows that, after one second, an object will have fallen a distance of 1/2 × 9.8 × 1 2 = 4.9 m. After two seconds it will have fallen 1/2 × 9.8 × 2 2 = 19.6 m ; and so on.

How far is 4 seconds of free fall?

For the distance traveled in the 4th second, find how far the object fell in 3 seconds (insert 3 secs in the formula) and subtract the result from 78.4 m.

How far would a person fall in 6 seconds?

How far does a person fall in 6 seconds? - Quora. The formula I learned in high school Physics is s=1/2gt squared, where s is distance in meters, g is the force of gravity (10 meters per second per second), and t is time in seconds. So in 6 seconds, a person will fall 5 x 36 or 180 meters .

How far is 1 second of free fall?

Assume the ball falls for 1 second. The speed of the falling ball as a function of time is v = 9.8 (m/s 2 ) t and the distance traveled is d = ½ 9.8 (m/s 2 ) t 2 . In one second the ball travels 4.9 m .

Free Fall Calculator (2024)

Last updated:Apr 03, 2024

Table of contents

What is the free fall definition?Free fall speedFree fall equationHow to use the free fall formula: an exampleHighest free fall in historyFAQs

This free fall calculator is a tool for finding the velocity of a falling object along with the distance it travels. Thanks to this tool, you can apply the free fall equation for any object, be it an apple you drop or a person skydiving.

Read on to learn the free fall definition and discover the most daring examples, including the highest free fall in history (spoiler alert: it broke the sound barrier)! We'll also explain what free fall acceleration is and why we assume it's constant.

Check out the projectile motion calculator, which describes a case of free fall combined with horizontal motion.

Prefer watching rather than reading? Check out our deep dive into the concept of free fall here:

What is the free fall definition?

In free fall, an object moves under the influence of gravitational force only. The only acceleration is the acceleration of gravity g. No other force, including air resistance, is acting on such an object.

Interestingly, an object in free fall doesn't necessarily need to be falling (that is, moving downwards). For example, the Moon's motion satisfies all of the conditions listed above: there is no other force acting on it other than gravity (it's being pulled towards the Earth), and there is no air resistance, as there is no air in space.

Why doesn't the Moon crash into Earth, then? It's because Moon's speed is not directed towards Earth, but tangentially to its orbit. Since the Moon is moving along an elliptic orbit with a high enough velocity, its motion generates a centrifugal force, equal and opposite to the force of gravity.

You may want to check out our gravitational force calculator and see what an amazing force gravity is.

Free fall speed

From the definition of velocity, we can find the velocity of a falling object is:

$v = v_0 + gt$ v=v0+gt

where:

$v_0$ v0 – Initial velocity (measured in m/s or ft/s);
$t$ t – Fall time (measured in seconds); and
$g$ g – Free fall acceleration (expressed in m/s² or ft/s²).

Without the effect of air resistance, each object in free fall would keep accelerating by 9.80665 m/s (approximately equal to 32.17405 ft/s) every second. In reality, though, a falling object's velocity is constrained by a value called the terminal velocity.

What is the terminal velocity? As you have seen above, the free-fall acceleration is constant, which means that the gravitational force acting on an object is constant, too. However, the force of air resistance increases with increasing free fall speed. At some point, the two forces become equal in magnitude. According to Newton's first law, at that point, the falling body stops accelerating and moves at a constant speed. This speed is the terminal velocity.

In this free fall calculator, we neglect the influence of air resistance. If you want to consider it, head over to our free fall with air resistance calculator.

Free fall equation

If you want to calculate the distance traveled by a falling object, you need to write down the equation of motion. If the initial displacement and velocity are both equal to zero, it boils down to:

$s = \frac {1}{2}gt^2$ s=21gt2

If the object is already traveling with an initial velocity, you have to take it into account, too:

$s = v_0 t + \frac {1}{2} g t^2$ s=v0t+21gt2

You can immediately see that the object's distance traveled is proportional to the fall time squared. It means that with each second, the falling body travels a substantially larger distance than before.

Another interesting fact is that according to the free fall formula, the distance does not depend on the mass of the falling object. If you drop a feather and a brick, they will hit the ground at the same time… Or at least that's what science says! If you try to perform an experiment, you'll notice that, in reality, the brick falls to the ground first. Why does that happen? Again, because of air resistance. If you dropped the two items in a vacuum, they would both hit the ground at the same instant!

How to use the free fall formula: an example

Still not sure how our free fall calculator works? Don't worry – we prepared a simple example to walk you through it.

Determine the gravitational acceleration. On Earth, this value is equal to 9.80665 m/s² on average (which is also the default value set in the free fall calculator).
Decide whether the object has an initial velocity. We will assume v₀ = 0 m/s.
Choose how long the object is falling. In this example, we will use the time of 8 seconds.
Calculate the final free fall speed (just before hitting the ground) with the formula:
v = v₀ + gt = 0 + 9.80665 × 8 = 78.45 m/s.
Find the free fall distance using the equation:
s = (1/2)gt² = 0.5 × 9.80665 × 8² = 313.8 m.
If you know the height from which the object is falling, but don't know the time of fall, you can use this calculator to find it, too!

Highest free fall in history

You might already have learned the free fall equation, but it's one thing to understand the theory and a completely different one to experience it. There are many ways to experience the thrill of a free fall – you could, for example, jump with a parachute or try bungee jumping!

Technically, such a jump doesn't fulfill all the requirements of a free fall – there is substantial air resistance involved. In fact, a real free fall is only possible in a vacuum. Nevertheless, this is as close to the actual experience as you can get on Earth 😉

One of the most extreme examples of an almost-scientifically correct free fall is the jump of Dr. Alan Eustace, Google's VP of Knowledge, in 2014. Eustace jumped from a heart-stopping height of 135,908 feet (41,425 m), thus setting a new record for a parachute jump.

Surprisingly, Eustace declined Google's help in the jump and funded the project himself. It was not an easy endeavor because such a leap required him to go up in a special balloon and wear a custom-designed spacesuit that protected him from sudden shifts in temperature (after all, he was jumping from the edge of space). The fall itself took 15 minutes, and the maximum speed exceeded 800 miles per hour – far over the sound barrier!

FAQs

What is free fall speed?

Seconds after the object has begun falling	Speed during free fall (m/s)
1	9.8
2	19.6
3	29.4
4	39.2

Why is the weight of a free falling body zero?

It is not. An object in free fall will still have a weight, governed by the equation W = mg, where W is the object’s weight, m is the object’s mass, and g is the acceleration due to gravity. Weight, however, does not affect an object's free-falling speed. Two identically shaped objects weighing a different amount will hit the ground at the same time.

What is the difference between free fall and weightlessness?

Free fall is when an object is falling, only being affected by the force of gravity, while weightlessness is when an object has no weight due to there being no effect from gravity (it still has mass). Weightlessness can be achieved either in space or if an equal force can be applied in the opposite direction of gravity.

How do you find free fall acceleration of a planet?

To find the free fall acceleration of a planet:

Estimate the total mass of the planet in kilograms.
Find the radius of the planet, from its center to its surface, in meters.
Divide the total mass by the radius squared.
Multiply the result by the universal Gravitational constant:
6.67×10^-11N·m²·kg^-2
The result is the gravitational acceleration of the planet, which is also its free-fall acceleration.