When the athlete holds the barbell overhead, the reaction force is the weight of
ID: 1604083 • Letter: W
Question
When the athlete holds the barbell overhead, the reaction force is the weight of the barbell on the hand. How does this force vary for the case in which the barbell is accelerated upward? How does this force vary for the case in which the barbell is accelerated downward? A constant force is applied to an object, causing the object to acceleration at 10 m/s. what will the acceleration be if. (a) the force is halved? (b) the object's mass is halved? the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?Explanation / Answer
When the barebell is at rest, the weight of the barbell is equal to reaction force of the hand on the barbell.
If the barbell is accelerating upward, the net force is upward which mean that upward force caused by the hand is greater than weight of hte barbell.
If the barbell is accelerating downward, the net force is downward which mean that weight of the barbell is greater than reaction force of the hand.
16)
The equation for net froce is F= ma
Acceleration a = F/ m
a) If the force is halved, then the acceleration is also halved as both are directly proportional to each other .
b) If the object mass is halved then acceleration is doubled as acceleration is inversely proportional to the mass
c) Acceleration remains same as the change is same
d) Acceleration is reduced to one-fourth.
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