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Kinesiology 2241A/B Lecture Notes - Lecture 10: Centripetal Force, Mechanical Advantage

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jadeporpoise270
21 Oct 2018
School
Western University
Department
Kinesiology
Course
Kinesiology 2241A/B
Professor
Dr. Bechard

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Document Summary

Forces act in ways that they come in a lot of different shapes, forms, and sizes. Huge friction that they try to minimize. Wind resistance/fluid drag- force created by wind pushing on front edge. Centripetal and centrifugal forces- centripetal force pulling them toward axis of rotation at centre of track. Centrifugal trying to break them away from rotational axis torque defined: Created based on applying a force based on a point of pivot. Wrench is a tool where you apply a torque. A torque is just an angular force. A torque is equal to the size of the force (bigger the force, bigger the torque) Forces arm is the distance b/w where force is applied and the point of pivot in m. If i want a big torque: either increase amount of force i general or increase the force arm (physical distance b/w point of application and point of pivot) Measured in newton metres properties of a force arm:

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Related Questions

Learning Goal: To make the connection between the intuitive understanding of a seesaw and the standard formalism for torque. This problem deals with the concept of torque, the "twist" that an off-center force applies to a body that tends to make it rotate. (Figure 1)

(a) Marcel is helping his two children, Jacques and Gilles, to balance on a seesaw so that they will be able to make it tilt back and forth without the heavier child, Jacques, simply sinking to the ground. Given that Jacques, whose weight is W, is sitting at distance to the left of the pivot, at what distance should Marcel place Gilles, whose weight is, to the right of the pivot to balance the seesaw?

(b) Find the torque about the pivot due to the weight w of Gilles on the seesaw.

Express your answer in terms of L1 and w.

(c)Determine the sum of the torques on the seesaw. 

(d) Gilles has an identical twin, Jean, also of weight. The two twins now sit on the same side of the seesaw, with Gilles at distance from the pivot and Jean at distance. w L2 L3 Where should Marcel position Jacques to balance the seesaw?

(e) When Marcel finds the distance from the previous part, it turns out to be greater than, the distance from the pivot to the end of the seesaw. Hence, even with Jacques at the very end of the seesaw, the twins Gilles and Jean exert more torque than Jacques does. Marcel now elects to balance the seesaw by pushing sideways on an ornament (shown in red) that is at a height above the pivot.