It’s commonly understood that “It’s not the fall that kills you, it’s the sudden stop at the end.” A few summers ago I was roofing my house – the peak of which is roughly 18 feet above the ground. Let’s say I got so caught up in the joy of shingling, I carelessly stepped off the roof, falling to the pavement. Striking the ground, if my head came to rest over a distance of 8 mm (that distance would be the compression of my skull, BTW), a. What (large!) deceleration would I be experiencing (in m/s2)? b. Over what time interval would that deceleration take place?
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
It’s commonly understood that “It’s not the fall that kills you, it’s the sudden stop at the end.” A
few summers ago I was roofing my house – the peak of which is roughly 18 feet above the
ground. Let’s say I got so caught up in the joy of shingling, I carelessly stepped off the roof,
falling to the pavement. Striking the ground, if my head came to rest over a distance of 8 mm
(that distance would be the compression of my skull, BTW),
a. What (large!) deceleration would I be experiencing (in m/s2)?
b. Over what time interval would that deceleration take place?
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