Kinesiology 2241A/B Lecture Notes - Lecture 17: European Route E6, Accelerometer, Terminal Velocity

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blushzebra192

15 Dec 2016

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Document Summary

Speed and velocity are not the same thing. Velocity is a vector with all 4 attributes of a vector: magnitude is the speed, direction is the heading of the object, point of application is the center of mass of the object, line of action. Velocity is the rate at which position changes with respect to time. Instantaneous velocity cant measure instantaneous velocity in real life. Looking at the speed of a runner in a 100 meter sprint. If you take the average speed over too long and time interval, then you miss the acceleration and deceleration features. 100 hertz per second = good data collected instantaneous = continuous. Cyclic velocity cadence = # cycles per minute. Accelerometer is a device that measures if your speeding up or slowing down. Acceleration goes up at the square of your velocity (2^2 = 4, 4^2 = 16) Gra(cid:448)ity is al(cid:449)ays a(cid:272)ti(cid:374)g o(cid:374) the (cid:271)ody"s (cid:272)e(cid:374)ter of (cid:373)ass, pulli(cid:374)g it do(cid:449)(cid:374)(cid:449)ard.

Related Questions

This experiment involves centripetal force, the force that keeps objects moving in a circular path. This force is perpendicular to the motion and directed towards the center of the circular orbit. By Newton's Second Law when a centripetal force acts on a mass (in a horizontal plane), the force continually changes the direction of the velocity without changing its magnitude, speed. This change in the direction of the velocity accounts for the centripetal acceleration of the mass, whose direction is towards the center. The relationship between the centripetal force, the mass of the orbiting object, and its speed and distance from the center is described by:

EXTENSION QUESTION: When twirling the mass, students found that despite their best efforts, they could not swing the ball so that the cord remained exactly horizontal.

(a) On the diagram of the rotating mass below, draw a force diagram of the forces acting on the mass and identify each force. Do not include any force components in this diagram.

(b) Explain why it is not possible for the ball to swing so that the cord remains exactly horizontal. Write your answer using complete sentence

greytrout41

find the average power pavg created by the force f in terms of the average speed vavg of the sled.

A sled of mass is being pulled horizontally by a constant upward force of magnitude that makes an angle with the direction of motion. The coefficient of kinetic friction is . The average velocity of the sled is .

Part D

Find the average power created by force .

Express your answer in terms of

, and

=

Let us now consider several questions that include numeric data.

A sled is being pulled along a horizontal surface by a horizontal force of magnitude 600 N. Starting from rest, the sled speeds up with acceleration 0.08 ${\rm m/s}^2$ for 1 minute.