How Can You Calculate the Force of Impact Without Knowing All Variables?

[Mike123mike]

I have a scenario which is simply a ball hits the ground from above i know the mass of the ball and the speed in mph of the ball just before it hits the ground. No other variables are known, I need to know the force it hits the ground.

What is the best way to calculate it? I had thought F = m x a, but to calculate the acceleration I would need a distance?

Obviously I'm not a physics person and any help would be greatly appreciated.

 

[dave_baksh]

You also need to know the length of time that the ball is in contact with the ground. The formula for the force exerted is:

Force = (mass of the ball) x (speed of the ball)/(time the ball is in contact with the ground)

In order that the force is measured in Newtons you must use the following units:

mass: kilograms
speed: metres/second
time: seconds

 

[Mike123mike]

Thanks for that dave I don't suppose you can assist in calculating the time it is in contact with the ground as I suppose that time would vary depending on the speed too?

 

[xxChrisxx]

Impacts are tricky to just guess at. You'd have to make an educated guesstimate bases on Coefficient of restiution, deformation of ball and ground.

Even then you are only coming up with a very rough average to the impact event.