"No one need think that the world can be ruled without blood. The civil sword shall and must be red and bloody." – Andrew Jackson

The Eclectic Slide

If this story is any indication, it would appear the South African military hires NASCAR drivers to command its armored vehicles.

This is a video of one of the South African National Defense Force’s Rooikat armored reconnaissance vehicles almost swerving into the crowd of personnel gathered to watch a practice run of its military display prior to annual Armed Forces Day. “Screw it, it’s just practice,”

Apparently the driver asked a crewman to hold his beer. You can see the video below the fold…

…

I’d suggest it was a woman driver but I don’t want to be stabbed.

As my calculus instructor said to me, “Mathematics is the language of science.”

A force acting for a given amount of time will change an object’s momentum. Put another way, an unbalanced force always accelerates an object – either speeding it up or slowing it down. If the force acts opposite the object’s motion, it slows the object down. If a force acts in the same direction as the object’s motion, then the force speeds the object up. Either way, a force will change the velocity of an object. And if the velocity of the object is changed, then the momentum of the object is changed.

Impulse
These concepts are merely an outgrowth of Newton’s second law as discussed in an earlier unit. Newton’s second law (Fnet = m • a) stated that the acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the mass of the object. When combined with the definition of acceleration (a = change in velocity / time), the following equalities result.

F = m • a

or

F = m • ∆v / t

If both sides of the above equation are multiplied by the quantity t, a new equation results.

F • t = m • ∆v
This equation represents one of two primary principles to be used in the analysis of collisions during this unit. To truly understand the equation, it is important to understand its meaning in words. In words, it could be said that the force times the time equals the mass times the change in velocity. In physics, the quantity Force • time is known as impulse. And since the quantity m•v is the momentum, the quantity m•Δv must be the change in momentum. The equation really says that the

Just a little outside.

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Ingineer – His diplomatic immunity was almost revoked.

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At least he didn’t roll it. But he (or she) needs to bone up on the laws of physics. Particularly the ones concerning impulse and momentum.

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TX Nick – I was there would be no science here!

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Too bad:

As my calculus instructor said to me, “Mathematics is the language of science.”

A force acting for a given amount of time will change an object’s momentum. Put another way, an unbalanced force always accelerates an object – either speeding it up or slowing it down. If the force acts opposite the object’s motion, it slows the object down. If a force acts in the same direction as the object’s motion, then the force speeds the object up. Either way, a force will change the velocity of an object. And if the velocity of the object is changed, then the momentum of the object is changed.

Impulse

These concepts are merely an outgrowth of Newton’s second law as discussed in an earlier unit. Newton’s second law (Fnet = m • a) stated that the acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the mass of the object. When combined with the definition of acceleration (a = change in velocity / time), the following equalities result.

F = m • a

or

F = m • ∆v / t

If both sides of the above equation are multiplied by the quantity t, a new equation results.

F • t = m • ∆v

This equation represents one of two primary principles to be used in the analysis of collisions during this unit. To truly understand the equation, it is important to understand its meaning in words. In words, it could be said that the force times the time equals the mass times the change in velocity. In physics, the quantity Force • time is known as impulse. And since the quantity m•v is the momentum, the quantity m•Δv must be the change in momentum. The equation really says that the

Impulse = Change in momentum

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