NEWTON'S SECOND AND THIRD LAWS
Name
Me
HW
Block A
Block B
d.
Suppose the friction between the two blocks is reduced so
that block B slides down as the blocks move to the right. The
downward component of the acceleration of block B is Pm/s.
i. For block A and block B: (a) draw new free-body
diagrams and (b) write out the algebraic form of
Newton's second law.
ii. Is the magnitude of
the force exerted on
Block A
Block B
block A by the
ground in this case
greater than, less
IFFBA
than, or equal to the
Free-body
force exerted on
diagrams
block A by the
FNAB
FPAN
FPBA
ground in part c?
Explain.
" Fame
VFgBe
FNAG in this case
is less than FNAG
in part c, because
Algebraic form of
FPAR - FNAB : MACK FPBA= MBQx
the friction is
|Newton's 2"d law:
smaller.
y : NAG = FgAe - FEAD FOBe - FEBA = MBP
iii. Calculate the magnitude of the force exerted on block A by the ground. Show your work.
FNAB = FGAB + Fine
FinB : My (g - Qy) + MAg
FNAB = 118 N