87 F, 1.5 m A Pivot point 0.1 m FIGURE 1.5 A force applied to an erect person. 直 0 78°F A AR AR pri scn FB home end FB dn 6d 5. 0.1 m Pivot point FIGURE 1.5 A force applied to an erect person. uscles The opposite restoring torque Tw due to the person's weight is T, =W×0.1m (1.2) W Assuming that the mass m of the person is 70kg, his weight W is ing W =mg=70 × 9.8 = 686 newton (N) (1.3) g Tip-Toe (Here g is the gravitational acceleration, which has the magnitude 9.8m/sec².) The restoring torque produced by the weight is therefore 68.6 newton-meter (N-m). The person is on the verge of toppling when the magnitudes of these two torques are just equal; that is, T, =T, or nic Posture W iction ing at an Fa × 1.5m=68.6N – m (1.4) on at the Hip Therefore, the force required to topple an erect person is 68.6 Fa= 1.5 e Fin of a 45.7N (10.31b) (1.5) cribology . Oral ribology Actually, a person can withstand a much greater sideways force without losing balance by bending the torso in the direction opposite to the applied 2. Hair cribology 3. Biotribology Textiles cises er 3: Translational 78°F ENG W re to search TO
87 F, 1.5 m A Pivot point 0.1 m FIGURE 1.5 A force applied to an erect person. 直 0 78°F A AR AR pri scn FB home end FB dn 6d 5. 0.1 m Pivot point FIGURE 1.5 A force applied to an erect person. uscles The opposite restoring torque Tw due to the person's weight is T, =W×0.1m (1.2) W Assuming that the mass m of the person is 70kg, his weight W is ing W =mg=70 × 9.8 = 686 newton (N) (1.3) g Tip-Toe (Here g is the gravitational acceleration, which has the magnitude 9.8m/sec².) The restoring torque produced by the weight is therefore 68.6 newton-meter (N-m). The person is on the verge of toppling when the magnitudes of these two torques are just equal; that is, T, =T, or nic Posture W iction ing at an Fa × 1.5m=68.6N – m (1.4) on at the Hip Therefore, the force required to topple an erect person is 68.6 Fa= 1.5 e Fin of a 45.7N (10.31b) (1.5) cribology . Oral ribology Actually, a person can withstand a much greater sideways force without losing balance by bending the torso in the direction opposite to the applied 2. Hair cribology 3. Biotribology Textiles cises er 3: Translational 78°F ENG W re to search TO
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Referring to Fig.1.5, compute the coefficient of friction at which the tendency of the body to slide and the tendency to topple due to the applied force are equal.
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