You are lifting a heavy box. Well consider this process for different choices of

Question

You are lifting a heavy box. Well consider this process for different choices of system and surroundings. (1) Choose the box as the system of interest. What objects in the surroundings exert significant forces on this system? Check all that apply. The floor The box You None The Earth (2) Choose you and the box as the system of interest. What objects in the surroundings exert significant forces on this system? Check all that apply. The floor You The box The Earth None (3) Choose you, the box, and the Earth as the system of interest. What objects in the surroundings exert significant forces on this system? Check all that apply. The Earth None You The floor The box

Explanation / Answer

1) by earth - mg
and by you - normal reaction force

2) the flooe - normal reaction force
by earth - mg

3)None

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