4. Two identical blocks are connected by an ideal spring. The blocks are pushed

Question

4. Two identical blocks are connected by an ideal spring. The blocks are pushed towards each other across a level frictionless surface by hands that each exert a constant horizontal force of magnitude F0. At time t1, the blocks have speed v1, and the spring is at its equilibrium length. At time t2 when the experiment ends, the blocks have each moved a distance d0. The speed of each block at time t2, v2, is less than v1. State whether each of the following quantities is positive, negative or zero during the interval from t1 to t2, Explain. i. The work done on block A by the hand ii. The work done on block 8 by the hand

Explanation / Answer

4a) i)   Positive     since force by hand and the displacement of the block are in same direction.

4a) ii)   Positive     since force by hand and the displacement of the block are in same direction.

4a) iii)   Positive     since external force by each hand is Positive

4 b) Energy of the system remains same from energy conservation.

4 c) yes we agree.

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