# Weight of impact is from an object of 40kg that falls 50cm

• Jeanette
In summary, the conversation discusses the weight of impact from a 40kg object falling 50cm. It is mentioned that the force of impact is difficult to determine and depends on various factors. However, the impact energy can be calculated using the formula e=mgh. The velocity and time of impact are also considered in determining the force of impact.
Jeanette
Hi,

I have a basic question that i would be very thankful if someone could help me answer.

I need to find out what the weight of impact is from an object of 40kg that falls 50cm.

Many thanks.

Jeanette

Welcom to PF.

The force an object imparts at impact is extremely difficult to determine with math alone (and isn't constant throughout the impact anyway). It depends on the material properties and geometry of the object being dropped and the object being hit.

The best you can do with ease is impact energy, which for a dropped object far below terminal velocity is just e=mgh

If you know the deceleration, though, you can use f=ma. If you drop a hard object on a hard floor, the deceleration can be hundreds of g's.

I would first find the velocity at the moment of impact

D = 1/2*a*t^2
.5 = 1/2*9.8*t^2

t=.319

Vf = Vo + a*t^2
Vf = 0 + 9.8*.319 = 3.13 m/s

The time it takes to lose velocity (or acceleration) can depend upon what surface it's hitting, way it lands etc. as mentioned in the above post. But the force of impact will be the mass times the acceleration (velocity divided by time it takes to go from 3.13 m/s to 0 m/s). Hope this helped, and I also hope I didn't make a mistake on silly kinematics equations.

## 1. What is the formula for calculating the weight of impact?

The formula for calculating the weight of impact is W = mgh, where W is the weight of impact, m is the mass of the object, g is the acceleration due to gravity (9.8 m/s^2), and h is the height the object falls from.

## 2. How do you convert kilograms to pounds?

To convert kilograms to pounds, you multiply the number of kilograms by 2.20462. In this case, the 40kg object would weigh approximately 88.18 pounds.

## 3. What is the acceleration due to gravity?

The acceleration due to gravity, denoted as g, is the rate at which all objects fall towards the center of the Earth. On Earth, this value is approximately 9.8 m/s^2.

## 4. How does the height of the fall affect the weight of impact?

The weight of impact is directly proportional to the height of the fall. This means that the higher the object falls from, the greater the weight of impact will be.

## 5. Can the weight of impact of an object change based on its mass?

Yes, the weight of impact is directly proportional to the mass of the object. This means that the greater the mass of the object, the greater the weight of impact will be. In this case, a 40kg object will have a greater weight of impact than a 20kg object falling from the same height.

• Mechanics
Replies
15
Views
1K
• Mechanics
Replies
2
Views
1K
• Mechanics
Replies
4
Views
304
• Classical Physics
Replies
12
Views
1K
• Mechanics
Replies
15
Views
3K
• Mechanics
Replies
1
Views
426
• Mechanics
Replies
7
Views
2K
• Mechanics
Replies
2
Views
878
• Mechanics
Replies
4
Views
1K
• Mechanics
Replies
18
Views
565