The body in the figure is pivoted at O, and two forces act on it as shown. If r1 = 1.30m, r2 = 2.15m, F1 = 4.20N, F2 = 4.90N, theta1 = 75.0o, and theta2 = 60.0o,, what is the net torque about the pivot? I can find the magnitudes of the two torques (tau1 and tau2). I do not know how to determine their signs, that is, how to determine the direction of the rotation (clockwise or counterclockwise). Please explain what is the axis of rotation here, and how to determine the direction of of the rotation (clockwise or counterclockwise) for this problem specifically and in general.
Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
The body in the figure is pivoted at O, and two forces act on it as shown. If r1 = 1.30m, r2 = 2.15m, F1 = 4.20N, F2 = 4.90N, theta1 = 75.0o, and theta2 = 60.0o,, what is the net torque about the pivot?
I can find the magnitudes of the two torques (tau1 and tau2). I do not know how to determine their signs, that is, how to determine the direction of the rotation (clockwise or counterclockwise). Please explain what is the axis of rotation here, and how to determine the direction of of the rotation (clockwise or counterclockwise) for this problem specifically and in general.
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