Homework Help: physics

Posted by Melissa on Sunday, March 25, 2012 at 1:18pm.

How much applied force is needed to accelerate a 2.0 kg block of wood at 4.0m/s^2 along a rough table, against a 10 N force of friction?

physics - Damon, Sunday, March 25, 2012 at 1:29pm
Now we have two forces:

First is our force F
Second is that friction force, opposite to F so call it -10 Newtons

The block accelerates, so there is a net force (UNbalanced forces) which is net F =(F-10).
Since they are unbalanced and acceleration A results:

netF = m A

(F-10) = 2 * 4
F - 10 = 8
F = 18 N
If you do not get this PLEASE respond. You simply have to understand these three questions you asked before you go to the next chapter. This is the heart of the matter.
physics - Melissa, Sunday, March 25, 2012 at 2:03pm
Thank you so much I understand now !
physics - Damon, Sunday, March 25, 2012 at 2:12pm
Excellent - Those questions are extremely important.

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