Ignore friction and drag for all. a) If you lift an object straight up at consta
ID: 2173173 • Letter: I
Question
Ignore friction and drag for all.a) If you lift an object straight up at constant speed, doing 10 J of work on the object, how much work does gravity do on the object? Justify.
b) If you lift the object up to the same height, again at constant speed, but this time moving it sideways as well, will the work you do on the object be greater than less than or equal to 10 J. Justify.
c) If you lift the object straight up to the same height while speeding it up as well, will the work you do on the object be greater than, less than, or equal to 10 J. Justify
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Explanation / Answer
a) -10 J. There is no change in speed. So work done in lifting = change in potential energy by gravity b) It will be same. i.e 10 J. As the speed remains same. no force is applied sideways. c) work done will be greater because this time we are also increasing its kinetic energy.