Question

In which of the following cases is the work done positive or zero or negative?
a) Work done by the porter on a suitcase in lifting it from the platform on to his head.b) Work done by the force of gravity on suitcase as the suitcase falls from porter’s head.c) Work done by the porter standing on platform with suitcase on his head.d) Work done by force of gravity on a ball thrown up vertically up into the sky.e) Work done by force applied by hands of a man swimming in a pond.

Answer 1

Answer:

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Answer 2

Dear Student,

a) Work done by the porter on a suitcase in lifting it from the platform on to his head.

• Work done - Positive as direction of force and displacement is same.

b) Work done by the force of gravity on suitcase as the suitcase falls from porter’s head.

• Work done - Positive as direction of force and displacement is same.

c) Work done by the porter standing on platform with suitcase on his head.

• Work done - zero as no displacement occurs.

d) Work done by force of gravity on a ball thrown up vertically up into the sky.

• Work done - Negative as direction of force and displacement is opposite.

e) Work done by force applied by hands of a man swimming in a pond.

• Work done - Negative as direction of force and displacement is opposite.

Thanks dear...