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# Mechanics 1 Watch

1. Can anyone help me with this question?

The diagram (sorry no diagram) shows a block of mass 4kg at rest on a plane inclined at 35 degrees to the horizontal, under the action of a force of magnitude PN acting up the plane. The coefficient of friction between the block and the plane is 0.45.
Find the range of possible values of P.
2. (Original post by cole12)
Can anyone help me with this question?

The diagram (sorry no diagram) shows a block of mass 4kg at rest on a plane inclined at 35 degrees to the horizontal, under the action of a force of magnitude PN acting up the plane. The coefficient of friction between the block and the plane is 0.45.
Find the range of possible values of P.
are you given the acceleration?
3. Have you tried resolving the forces?
4. (Original post by aamirac)
Have you tried resolving the forces?
i did but i'm missing the acceleration or info to find the acceleration
5. (Original post by thefatone)
are you given the acceleration?
No this is all I'm given 😞
6. (Original post by cole12)
No this is all I'm given 😞
i must be missing something then....
7. (Original post by thefatone)
i must be missing something then....
'at rest'
8. (Original post by thefatone)
i must be missing something then....
Since it's at rest it isn't accelerating
9. (Original post by cole12)
No this is all I'm given 😞
can you possibly give me the orginal question please?
10. What have you tried so far? What are the conditions for an object to be at rest and how could we use that to help us
11. (Original post by thefatone)
can you possibly give me the orginal question please?
Yes it's:

The diagram (sorry no diagram) shows a block of mass 4kg at rest on a plane inclined at 35 degrees to the horizontal, under the action of a force of magnitude PN acting up the plane. The coefficient of friction between the block and the plane is 0.45.Find the range of possible values of P.
12. (Original post by cole12)
Yes it's:

The diagram (sorry no diagram) shows a block of mass 4kg at rest on a plane inclined at 35 degrees to the horizontal, under the action of a force of magnitude PN acting up the plane. The coefficient of friction between the block and the plane is 0.45.Find the range of possible values of P.
oh ... i guess that's that then xD
13. (Original post by cole12)
Yes it's:

The diagram (sorry no diagram) shows a block of mass 4kg at rest on a plane inclined at 35 degrees to the horizontal, under the action of a force of magnitude PN acting up the plane. The coefficient of friction between the block and the plane is 0.45.Find the range of possible values of P.
This is as far as i got (i supposed to be able to answer this for you since i've done this topic *cries in the corner)
see if you can go any further

14. (Original post by thefatone)
This is as far as i got (i supposed to be able to answer this for you since i've done this topic *cries in the corner)
see if you can go any further

What dies f=muR give you?
15. It gives me what F is so i can sub into P-F-4gsin35=4a
16. (Original post by thefatone)
It gives me what F is so i can sub into P-F-4gsin35=4a
It does and it doesn't. Imagine I have a block of mass 1kg mu is 0.5. I push it with a force of 1n to the right. Does the block move left because muR =4.9, or is there something slightly different about what muR is working out?
17. it could be on the point of slipping downhill.... or uphill...
18. (Original post by samb1234)
It does and it doesn't. Imagine I have a block of mass 1kg mu is 0.5. I push it with a force of 1n to the right. Does the block move left because muR =4.9, or is there something slightly different about what muR is working out?
(Original post by the bear)
it could be on the point of slipping downhill.... or uphill...
That was part of the problem that arose, i just assumed(as shown in the diagram) that the block is moving up the hill, just so that i could do some workings ^-^
19. (Original post by samb1234)
What dies f=muR give you?
P is greater than/equal to 0.8
P is less than/equal to 36.9

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