What is the Net Force on a Block Against a Wall With Static Friction?

AI Thread Summary
To determine the net force on a block against a wall with static friction, the horizontal force F must balance the forces acting on the block. The weight of the block is 5.0 N, and the coefficient of static friction is 0.25, which allows for the calculation of the maximum static friction force. The net force is the sum of the normal force and the static friction force, with the static friction acting upward to counteract the weight. A free body diagram is essential to visualize the forces, showing how the upward static friction and downward weight balance with the left/right forces from the applied force and normal force. Understanding the relationship between these forces is crucial for solving the problem effectively.
kathmill
Messages
4
Reaction score
0

Homework Statement


A horizontal force F pushes a block of weight 5.0 N aganist a vertical wall. The coefficient of static friction between the wall and the block is 0.25. The force F is the minimum required to hold the block in place.
Find the magnitude of the net force on the block by the wall (include both normal force and friction force).


Homework Equations



F = ma
Fs = coefficient of static friction * normal force.

The Attempt at a Solution



F = Fs + Fn

I don't understand how to calculate the horizontal aspect of it? Any help?

Thanks!
 
Physics news on Phys.org
Draw a free body diagram for the mass, the upward/downward forces and the left/right forces...
what keeps the mass from sliding up and down and what keeps the mass from going through the wall...
 
So the static friction force is an upward force and mg is a downward force; whereas the force applied (which I am trying to find) and the normal force are left/ right forces. But how do the up/down and left/right compare to each other?
 
Yeah you got the direction of the forces...
So what you have in essence is
http://geocities.com/hackers_007_008/Untitled.jpg
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Friction problem of a block sandwiched between 2 surfaces
Replies
6
Views
1K
How can I determine the instant the block overcomes static friction?
2
Replies
61
Views
3K
Static equilibrium | Uniform sphere on incline | Determining friction
Replies
43
Views
2K
Force of the wall against the ladder is from static friction?
Replies
6
Views
3K
Coefficient of kinetic friction of a block sliding across the ceiling
Replies
7
Views
1K
Find the frictional force between a block and a wall
Replies
5
Views
3K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
3K
Is friction really always related to the normal force?
Replies
5
Views
2K
What is the static friction force acting on the object?
Replies
2
Views
2K
For the friction formula when to use Fn(normal force)×mu and when F×mu
Replies
17
Views
2K

Hot Threads

Recent Insights

Back
Top