# The natural gait ( walking speed) of almost all creaturesisdetermined by the pendulum period for the length of the leg,Thissped uses the least energy. why do short people tend to walkwithquicker strides then do tall people? your answer should relatethelength of a leg to the period of pendulum..

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#Tyrannosaurs are shown to be very speedy in the movies,dangerouslyso
Using pendulum motion, estimate the running speed of a big (7ton)tyrannosaur like sue.
Sue's stride (the distance between one footprint and thenextfootprint made by the same foot) was a ground eating 15 feetandthe distance from the ground to the hip socket is 3.6 meters.Themaximum running speed (at which bones break) of a creature isabout3 to 4 times the natural gait ( normal walking speed). Humanscanrun briefly at approximately 20 mph when chased byravenouscarnivores and at approximately 8 mph for hours. should youbeconcerned?

The physics of circular motion sets an upper limit to the speed of human walking. (If you need to go faster, your gait changes from a walk to a run.) If you take a few steps and watch what's happening, you'll see that your body pivots in circular motion over your forward foot as you bring your rear foot forward for the next step. As you do so, the normal force of the ground on your foot decreases and your body tries to "lift off" from the ground.

a) A person's center of mass is very near the hips, at the top of the legs. Model a person as a particle of mass m at the top of a leg of length L. Find an expression for the person's maximum walking speed v_max. Express your answer in terms of the variables L and appropriate constants.

b) Evaluate your expression for the maximum walking speed of a 70 kg person with a typical leg length of 70 cm. Give your answer in m/s.

c.) Give your answer in mph.

emeraldgerbil245

In a ballistic pendulum an object of mass m is fired with an initial speed at a pendulum bob. The bob has a mass M, which is suspended by a rod of length L and negligible mass. After the collision, the pendulum and object stick together and swing to a maximum angular displacement θ as shown