How Much Force is Needed to Move a 50kg Box with Friction and Acceleration?

[sbesner]

Hello everyone... I have been having some issues with this one particular... I'm sure its very simple, I just can't rap my head around it!Calculate the horizontal force required to move a 50kg box across level floor with an acceleration of 0.620 m/s/s if coefficient of friction is 0.110

FORCE = ??

I think its the acceleration that is throwing me off here. Would i need to find my Frictional force then determine my Fnet?

Thanks in advance for the aid.

-Stephan

 

[vissh]

Hello >:D
Hmm a basic question indeed :D
The block is lying on rough horizontal surface.When an Force is applied, the Static friction,f_s will come into play and try to oppose the relative motion.f_s will increase as applied force is increased.But f_s got a max. value (coef. of friciton)*(normal rxn by surface applying frictional force) and after that Kinetic friction will act and have value same as (coef. of friciton)*(normal rxn by surface applying frictional force)
Let the force applied Be F , Kinetic friction in opposite direction of F and apply Newton's second law .
U will get the answer :D

Hope this helps:)

 

[jmb88korean]

Knowing both mass and acceleration you should find fnet using F=ma. This value plus the frictional force must equal the applied force so simply use the mass to find the normal force to get frictional force.

 

[Paulie323]

this is a easy problem al this means is to move the box forward your applied force will be Fnet+Ff.
hope this helps!