Question

While Robert was helping his father in the garden, he pushed a shovel into the ground to dig a hole in the dirt. He picked up a shrub, carried it to the
hole, and held it while he lowered it into the hole. During which parts of this process does Robert NOT do work? Choose the two statements that apply.
A. He pushed a shovel into the ground to dig a hole.
B. He picked up a shrub.
C. He carried it to the hole
D. He held it while he lowered it into the hole

Answer 1

Work done is given by the change in kinetic energy of an object

• The kinetic energy of the shovel, the shrub, and in Robert's movement were changed, therefore, work is done in the given processes,

Reason:

Work is done when the total energy of object is affected by the application of force on the object over a distance

Therefore;

• In option A, pushing the shovel into ground (to dig out the dirt) the requires the application of a force (push) over a distance, (into and out of the ground) therefore work is done

• In option B, picking the shrub up gives it gravitational potential energy, therefore, work is done

• In option C, carrying the shrub to the hole does visible work

• In option D, holding the shrub while lowering it into the hole does work by preventing the shrub from falling randomly

Therefore, work is done in the given processes

Learn more about work-energy theorem here:

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