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# Question about reaction forces M1 watch

1. if an object is on an inclined plane and the plane is rough then there'll be a reaction force, resistive force and a coefficient of friction.

if the plane is smooth then is the reaction and resistive force included or not?
2. If it is smooth then the coefficient of friction is 0
So the resitive force of the plane is zero
However there is always a reaction force as Newton law states every action force has an equal and opposite reaction force.
3. (Original post by thefatone)
if an object is on an inclined plane and the plane is rough then there'll be a reaction force, resistive force and a coefficient of friction.

if the plane is smooth then is the reaction and resistive force included or not?
Reaction force will be there but no resistive frictional force.
4. (Original post by Squishy®)
If it is smooth then the coefficient of friction is 0
So the resitive force of the plane is zero
However there is always a reaction force as Newton law states every action force has an equal and opposite reaction force.
(Original post by B_9710)
Reaction force will be there but no resistive frictional force.
okay thanks a lot, i was doubting my own knowledge xD
5. (Original post by thefatone)
.....

if an object is on an inclined plane and the plane is rough then there'll be a NORMAL reaction force, a resistive force say air resistance if moving, FRICTION, its weight and any (optional) external force the question may have ...if the plane is smooth then is the only thing missing is friction
6. (Original post by B_9710)
Reaction force will be there but no resistive frictional force.
not quite ...
7. (Original post by TeeEm)
not quite ...
How so?
8. (Original post by B_9710)
How so?
resistive means ground friction as well as other resistances ...
9. (Original post by TeeEm)
not quite ...
What u mean? Fr=ùR and ù=0 so Fr=0
10. (Original post by TeeEm)
if an object is on an inclined plane and the plane is rough then there'll be a NORMAL reaction force, a resistive force say air resistance if moving, FRICTION, its weight and any (optional) external force the question may have ...if the plane is smooth then is the only thing missing is friction
okay so friction applies whether the plane is rough or smooth?

but i thought the definition of smooth meant not friction?
11. (Original post by TeeEm)
resistive means ground friction as well as other resistances ...
Yes I should have made it more clear perhaps. I was referring to specifically the frictional force.
12. (Original post by B_9710)
Yes I should have made it more clear perhaps. I was referring to specifically the frictional force.
no worries
13. (Original post by thefatone)
okay so friction applies whether the plane is rough or smooth?

but i thought the definition of smooth meant not friction?
as far as you are concerned smooth means ground friction is not present
14. (Original post by Squishy®)
What u mean? Fr=ùR and ù=0 so Fr=0
look at post 5 & 8
15. (Original post by TeeEm)
as far as you are concerned smooth means ground friction is not present
so when plane is smooth no friction or reaction force?
16. (Original post by thefatone)
so when plane is smooth no friction or reaction force?
no ground friction !
17. (Original post by TeeEm)
no ground friction !
is there a difference between ground friction and friction? (besides the fact that one of them specifies ground in front of it)
18. (Original post by thefatone)
is there a difference between ground friction and friction? (besides the fact that one of them specifies ground in front of it)
no difference
19. (Original post by TeeEm)
no ground friction !
Lol only losers refer to other resistive forces as friction.
20. (Original post by TeeEm)
no difference
so only the reaction force applies when the plane is smooth? no friction

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