Finding F on a box on an inclined plane

AI Thread Summary
The discussion revolves around solving a physics problem involving a block on an inclined plane, with a focus on determining the force required to prevent slipping, initiate movement, and maintain constant velocity. Key equations related to static and kinetic friction are mentioned, emphasizing the need for a free body diagram (FBD) to analyze the forces acting on the block. Participants express confusion over the problem-solving process, particularly after drawing the FBD. The importance of establishing the x and y equations from the FBD is highlighted as a crucial step for further assistance. Clarifying these equations will help in finding the minimum force values needed for the block's movement.
mistabry
Messages
12
Reaction score
0

Homework Statement



A block weighing 87.5 N rests on a plane inclined at 25.0o to the horizontal. A force is applied to the object at 50.0o to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively, 0.335 and 0.156.
(a) What is the minimum value of F that will prevent the block from slipping down the plane?
(b) What is the minimum value of F that will start the block moving up the plane?
(c) Once moving, what value of F will move the block up the plane with constant velocity?


Homework Equations


fs<= μs|N|
fk= μk|N|

The Attempt at a Solution


I attempted the problem by drawing out a free body diagram of what is occurring, but I was unable to continue after that because everything got all confusing! Help D;!
 
Physics news on Phys.org
hi mistabry! :wink:

mistabry said:
I attempted the problem by drawing out a free body diagram of what is occurring, but I was unable to continue after that because everything got all confusing! Help D;!

the fbd has only four forces …

what are your x and y equations? :smile:
 
You have to do it using FBD. Though confusing, you have to post it. We will take after that.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
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

Block on top of an inclined plane, with a rough surface, that moves with constant acceleration
Replies
41
Views
4K
Dynamics problem involving an inclined plane and Friction
Replies
1
Views
2K
Is the Block Moving Horizontally or Perpendicularly on the Inclined Plane?
Replies
3
Views
2K
Calculating Work and Kinetic Energy on an Inclined Plane
Replies
2
Views
3K
A block lies on an inclined plane with an angle of elevation
Replies
16
Views
5K
Question Concerning The Coefficient of Friction: Block on a Rough Inclined Plane
Replies
5
Views
2K
Find acceleration of Moving incline with a block on it
Replies
11
Views
3K
What is the displacement of a 3.0 kg block sliding down an inclined plane?
Replies
12
Views
2K
Inclined plane with friction and external force
Replies
2
Views
3K
Determining the angle while dealing with friction on an inclined plane
Replies
8
Views
3K

Hot Threads

Recent Insights

Back
Top