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Check all the boxes that correspond to forces doing zero work
gravity acting on a projectile that has been launched straight up
You pushing your stalled car, but it doesn't budge
Drag acting on a plane flying horizontally
gravity acting on your car as it drives horizontally
An olympic weightlifter holding a barbell above their head (the barbell is motionless)
sliding friciton acting on a car slilding to a stop

Respuesta :

The definition of work is force acting thru a distance: W = F * S

Forces doing zero work:

1) Pushing a stalled car that doesn't move

2) No work is done by gravity on car driving horizontally

3) No work is done on a motionless barbell

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