# Calculating Force from Stopping in Gravity: Help Appreciated

• Pete78
In summary, the conversation is about calculating the force needed to stop an object that is freely falling towards Earth at a speed of 0.6 m/s. The equation f=ma is mentioned, but it is noted that this only gives the net force and does not account for other forces at play. The question of how to incorporate gravity into the calculation is also brought up.
Pete78
Hi
I am trying to roughly calculate a force.
If i am moving an object towards the Earth and then stop it, how much force will this generate?
a=vf-vi/t
- vi =0.6m/s
-vf= 0
-t = 0.1 s

This equalling - a

Then applying f=ma
m=150kg

Im unsure how to add gravity into this.

would...
0-(9.8+0.6)/0.1 be a good way to estimate this?

Any help is appreciated.
Thanks in advance[Moderator's note: Moved from a technical forum and thus no template.]

Last edited by a moderator:
No. The units of grand v are not the same anyway.
Presumably the object is freely falling and you apply an upward force to stop it when it reaches a speed of 0.6 m/s. You want to know that force.
In your equation f = ma, f is actually the net force and consists of more than one force acting on it. Can you identify these forces?

## 1. How do I calculate force from stopping in gravity?

To calculate force from stopping in gravity, you will need to use the equation F = m * a, where F is force, m is mass, and a is acceleration. First, determine the mass of the object that is stopping in gravity. Then, calculate the acceleration of the object due to gravity, which is approximately 9.8 m/s^2 on Earth. Finally, plug in the values into the equation to find the force.

## 2. What is the difference between mass and weight?

Mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on an object. Mass is measured in kilograms, while weight is measured in Newtons. The mass of an object will stay the same regardless of its location, but its weight may change depending on the strength of gravity.

## 3. How does the force of gravity affect an object's motion?

The force of gravity causes objects to accelerate towards the center of the Earth. This acceleration is constant and is approximately 9.8 m/s^2 on Earth. The force of gravity also affects the weight of an object, as heavier objects will experience a greater force of gravity.

## 4. Can force and acceleration be negative?

Yes, both force and acceleration can be negative. A negative force would indicate that the force is acting in the opposite direction of motion, while a negative acceleration would indicate that the object is decelerating or slowing down.

## 5. What other factors can affect the force of stopping in gravity?

The force of stopping in gravity can also be affected by air resistance and friction. Air resistance is the force exerted by air molecules on an object in motion, and it can act in the opposite direction of motion. Friction is the force that opposes motion between two surfaces in contact, and it can also act in the opposite direction of motion.

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