When an athlete holds the barbell directly over his head, the force he exerts on the barbell is the same as the force exerted by the barbell on him. How do these forces (the weight of the barbell, the force exerted by the man on the barbell, and the force exerted by the barbell on the man) vary for the case in which the barbell is accelerated upward?

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Physics

Lincoln Thomas

15 April, 22:33

When an athlete holds the barbell directly over his head, the force he exerts on the barbell is the same as the force exerted by the barbell on him. How do these forces (the weight of the barbell, the force exerted by the man on the barbell, and the force exerted by the barbell on the man) vary for the case in which the barbell is accelerated upward?

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Ellen Craig · Answer 1

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Explanation:

When the barbell is accelerated upward, the force exerted by the athlete is greater than the weight of the barbell. (The barbell, simultaneously, pushes with greater force against the athlete.) When acceleration is downward, the force supplied by the athlete is less than the force applied by the barbell on the athlete.