Question

Which of the following is not an example of work?



A.
raising a barbell over your head


B.
picking up a box off the floor


C.
holding a tray in the cafeteria line


D.
pushing a box across the floor

Answer 1

You have work whenever you have a net force on a moving object.

Answer 2

Let me rephrase that.

Answer 3

so D

Answer 4

You have work whenever you have a net force on an object that is moving at least somewhat in the direction of the net force.

Answer 5

because you moved the box

Answer 6

Draw a diagram of the object. Draw the force and draw the velocity vector! If they're not perpendicular, they're in the same direction at least a little.

Answer 7

Right! So you have done work on the box!

Answer 8

The question would like to know which is not an example of work.

Answer 9

So its C

Answer 10

theres no real movement

Answer 11

Right! :)

Answer 12

Congrats!

Answer 13

Thank you so much!

Answer 14

You're welcome!