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Flashcards in Mechanics Deck (8)
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Limiting equilibrium

- at the point of sliding
-maximum value of frictional force the surface can exert on object
-friction build up n up till it reach its maximum
-after that the object can move

1

Ff=uR

-when object is moving or at the point of sliding
-when object not moving F

2

F-Ff=ma

For cars,
P-R=ma
F/v-R=ma

3

a=0

F-Ff=0
F=Ff
P=R
F/v=R

4

a=+ve

Engine power>Resistance, so that vehicle accelerate is positive direction -->
F-Ff=+ve
F>Ff
P>R
F/v>R

5

a=-ve

Engine powerF-Ff=-ve
FPFv

6

Constant velocity
Maximum velocity
Minimum velocity

a=0
F-Ff=0
P-R=0
*F/Vmin=R, haven't start accelerating
*F/Vmax=R, doesn't accelerates further

7

a=0

Constant velocity
Maximum velocity (doesn't accelerate further)
Minimum velocity (haven't start accelerating)
F-Ff=0
P-R=0
*F/Vmin=R
*F/Vmax=R