please help with 8.5, 8.6, 8.7, 8.8
8.5
a) Yes, the block(and system) does not lose energy, so the block will rise to the same height.
b) The work done by gravity is positive as the gravitational potential energy of the block decreases when moves down to the bottom, since the work done by the gravity = - change in potential energy ,
Work done by gravity is positive.
c) The work done by gravity is negative this time. The potential energy of the block increases as it rises to the maximum height.
d) No, the block will not rise to the same height. The block loses energy due to friction.
e) The work done by the friction is negative as the block does not rise to the same height.
Work done by gravity positive, negative, or zero (c) After the block reaches the bottom, and cont...
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