Question 25: There are four pairs of forces as follows: a) The force of the hand pulling the bucket up and the weight of the bucket; b) The weight of the orange on one Robovan balance and the weight of the weights on the pan remaining when the balance is balanced; c) The force of the athlete’s hand lifting the dumbbell and the weight of the dumbbell; d) The force of the student’s hand holding the chalk at rest and the gravity of the chalk. Ask which pair of forces is the pair of balanced forces:
The force of the student’s hand holding the chalk at rest and the gravity of the stool are two equal forces. Cases a and c are all moving, so they are not necessarily balanced. In case b, two forces in the same direction act on two different objects, so they are not balanced.
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