Data:

Net Force of Collision: 20,000 pounds/90,000 Newtons

Mass of Vehicle: 6,500 pounds/29,250 Newtons

Time Duration of Collision: 0.15 seconds

Vehicle Speed after Collision: 0

Other Data:

Car applied brakes around 24 meters before the steel swing gate.

Coefficient of Static Friction: around 0.732

Coefficient of Kinetic Friction: around 0.798

I do realize this is a physics problem, but I can't seem to figure out the math behind it. Anybody willing to help?

GoldenLeaf Dec 9, 2015

#1**+15 **

You don't say what you are trying to calculate, so I've assumed you want to find the approaching velocities.

Also you can't have a mass in Newtons, so I've converted your 6500 pounds (mass) to kg. (there is a difference between lbf (force) and lb (mass)).

On second thoughts I should probably have assumed kinetic friction. However, static friction is usually higher than kinetic friction, so perhaps I've used the right ** numerical **value after all!

Alan Dec 9, 2015

#1**+15 **

Best Answer

You don't say what you are trying to calculate, so I've assumed you want to find the approaching velocities.

Also you can't have a mass in Newtons, so I've converted your 6500 pounds (mass) to kg. (there is a difference between lbf (force) and lb (mass)).

On second thoughts I should probably have assumed kinetic friction. However, static friction is usually higher than kinetic friction, so perhaps I've used the right ** numerical **value after all!

Alan Dec 9, 2015