Torque. changing rotational motion. § 10.1–10.2. Example Problem. If the pulley has no mass: What is the machine’s change in potential energy from its initial to its final states? With what speed will the heavier mass hit the ground?. r. m p. v 0 = 0. m 1. m 2. h. Example Problem.
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changing rotational motion
If the pulley has no mass:
v0 = 0
If the pulley has mass mp and radius r:
You push on a door. It will open easiest if you push
opposite the hinge.
at the center of the door.
near the hinge.
tnet = Ia
t = Fl
Shortest distance from line of action to point of interest
Source: Young and Freedman, Figure 10.2
Force P is applied to one end of a lever of length L. What is the magnitude of the torque about point A?
PL sin q.
PL cos q.
PL tan q.
PL sec q.
PL cot q.
PL csc q.
Source: Young and Freedman, Test Your Understanding §10.1
A B = AB sin q
Maximum for q = 90°
Zero for q = 0°, 180°
AB = area of parallelogram
Source: Hewitt, Conceptual Physics