Homework Help: physics

Posted by Melissa on Sunday, March 25, 2012 at 12:43pm.

A woman pushes a refrigerator across the floor at a steady speed of 20cm/s . If she has to push with a horizontal force of 400 N to keep it moving , is the force of friction less than 400 N , 400 N, more than 400 N, why

physics - drwls, Sunday, March 25, 2012 at 12:47pm
For zero acceleration, the net force must be zero. What does that tell you about the friction force?
physics - Melissa, Sunday, March 25, 2012 at 12:55pm
The force of friction is zero?
physics - Damon, Sunday, March 25, 2012 at 2:15pm
constant velocity means NET force of zero.
That means the push exactly balances friction
so friction force is -400 if F is +400

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