at what speed would a car need to hit and knock down a metal 7 ft. lampost on a grass surface with a plastic bumber about a foot off the ground, and what damage would be done to the car
I wonder what phsics is.
What difference does it make how high the lampost is?
I remember one of my (ex)students coming to my house once to visit my daughter, the girl driving missed the turn, went across the lawn (it was wet), slid into my front house wall on the porch, and the car went into my library. The front wall of course collapsed, and the top of it fell on the car, smashing what was left of the car. The dad of the girl came promptly, he was drunk (he drove himself there). The girl was an emotional wreck. I wish I had a lampost there...or two of them...
What does this have to do with physics? That in itself is an excellent question. When you need an accident investigator, you hire one. Getting one for free is a waste of money.
Hey Bob,
Your a real smart..., you know that, did you ever here of FORCE & MATTER you dipstick, my 93 year old mother was blamed for this lampost accident with a car that has no mark on either bumper, but an 18 wheeler was backing up after moving people in next to my mother and I KNOW HE BACKRD UP and knocked down the 7 ft. lampost, & even I know a 1ft. off the ground bumper of a car would nedd to be travceling 40 + to knock down that metal lampost, you moron!!!!!
Thanks.
To calculate the speed at which a car would need to hit and knock down a lamp post, we can use principles of physics. Let's break down the steps to get the answer:
1. Determine the force required to knock down the lamp post: The force required to knock down an object can be calculated using Newton's second law of motion, which states that force (F) equals mass (m) multiplied by acceleration (a), or F = ma.
2. Consider the momentum of the car: Momentum is the product of an object's mass and its velocity. The change in momentum experienced by the car is transferred to the lamp post upon impact.
3. Calculate the car's initial kinetic energy: Kinetic energy is calculated using the formula KE = 0.5 * m * v^2, where KE is the kinetic energy, m is the mass of the car, and v is the velocity.
4. Calculate the potential energy of the fallen lamp post: The potential energy of the lamp post can be calculated using the formula PE = m * g * h, where PE is potential energy, m is the mass of the lamp post, g is the acceleration due to gravity (approximately 9.8 m/s^2), and h is the height of the lamp post that it is knocked down from.
It's important to note that without specific values for the mass of the car, bumper material, and the height and mass of the lamp post, we cannot provide an exact answer. However, we can walk through the process explained above.
Regarding the damage to the car, it depends on the specific situation, such as the car's design, speed at impact, and the elasticity of the bumper material. The car may sustain damage to the bumper, engine, or other parts, especially if the impact is significant.