ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: Cthulhu on May 04, 2010, 05:05:41 pm

Title: Simple(?) forces question.
Post by: Cthulhu on May 04, 2010, 05:05:41 pm

So I was watching G-Force last night(shut up) and theres a scene where an SUV through a fireworks 'launch zone' I'd guess you'd call it and the fireworks are set off. One of the fireworks hits underneath the SUV and flips the car over which got me thinking: What would the thrust of the firework have to be to actually flip the SUV over.
Assume that the SUV weighs 2500kg and that the mass of the black powder in the firework was 0.454kg and that it burnt for 1.23seconds before hitting the vehicle which is 0.254m above the ground.

kgo.

Title: Re: Simple(?) forces question.
Post by: Mao on May 05, 2010, 01:33:07 am

Flip over in which direction? We're talking about rotation of an object here, so we'll be dealing with torque and angular stuff. Also, if the SUV is suspended above the ground, a very small force can give the car some angular momentum and will [eventually] flip the SUV. So what is the velocity of the SUV [especially interested in the vertical component]? Also, what size rotation is required for a 'flip', because a rotation of more than 90 degrees will mean it'll land on its top on impact.

But since we're dealing with angular motion, we'll also need the moment of inertia.