Tutorial Section 4.3 - Energy and net work 1. Two people push on a block. Person 1 pushes to the right and person 2 pushes to the left. Draw a free-body diagram for the block in each case. Base your answer on H1 3 H2 your free-body diagram and your knowledge of the block's motion, circle whether each quantity is positive, negative, or zero. The block moves to the right and speeds up. The block moves to the left and speeds up Free-body diagram WH1: 0 Free-body diagram WH1: WH2 WH2: Wnet Wnet Explain Explain The block moves to the right and slows down. The block moves to the left with constant speed. WHT: + 0 Free-body diagram WHY: Free-body diagram WH2- + WH2 + Wnet + Wnet + Geog orth li egnerio show iveig er 1 .8.9) 1 Explain Explain 2. Is the net work done on the block greater than, less than, or equal to the work done by the net force on the block? Explain your reasoning. 3. Generalize from your answers above to describe how the speed of this object changed when the net work done on the object was (1) positive, (2) negative, or (3) zero