Exercise 19repeat exercise 3 with the contestant pulling, Ask an Expert

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Exercise 19.

Repeat Exercise 3. with the contestant pulling the block of ice with a rope over his shoulder at the same angle above the horizontal as shown in Figure 5.7(b).

Which method of sliding a block of ice requires less forceA?(a) pushing or (b) pulling at the same angle above the horizontal?

This is Exercise 3.

(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee?

(b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions?

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