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PROBLEM 12.F2
Two blocks weighing WA and WB are at rest on a conveyor that is initially at
rest. The belt is suddenly started in an upward direction so that slipping
occurs between the belt and the boxes. Assuming the coefficient of friction
between the boxes and the belt is
k, draw the FBDs and KDs for blocks
A and B. How would you determine if A and B remain in contact?
PROBLEM 12.F3
Objects A, B, and C have masses mA, mB, and mC respectively.
The coefficient of kinetic friction between A and B is
k, and
the friction between A and the ground is negligible and the
pulleys are massless and frictionless. Assuming B slides on A
draw the FBD and KD for each of the three masses A, B and C.
PROBLEM 12.F4
Blocks A and B have masses mA and mB respectively. Neglecting friction
between all surfaces, draw the FBD and KD for each mass.
PROBLEM 12.F5
Blocks A and B have masses mA and mB respectively.
Neglecting friction between all surfaces, draw the FBD
and KD for the two systems shown.
PROBLEM 12.F6
A pilot of mass m flies a jet in a half vertical loop of radius R so that
the speed of the jet, v, remains constant. Draw a FBD and KD of the
pilot at Points A, B and C.
PROBLEM 12.F7
Wires AC and BC are attached to a sphere which revolves at a constant speed v in
the horizontal circle of radius r as shown. Draw a FBD and KD of C.
PROBLEM 12.F8
A collar of mass m is attached to a spring and slides without
friction along a circular rod in a vertical plane. The spring has
an undeformed length of 5 in. and a constant k. Knowing that
the collar has a speed v at Point C, draw the FBD and KD of
the collar at this point.
PROBLEM 12.F9
Four pins slide in four separate slots cut in a horizontal circular plate as
shown. When the plate is at rest, each pin has a velocity directed as shown
and of the same constant magnitude u. Each pin has a mass m and
maintains the same velocity relative to the plate when the plate rotates
about O with a constant counterclockwise angular velocity
. Draw the
FBDs and KDs to determine the forces on pins P1 and P2.
PROBLEM 12.F10
At the instant shown, the length of the boom AB is being decreased at the
constant rate of 0.2 m/s, and the boom is being lowered at the constant rate of
0.08 rad/s. If the mass of the men and lift connected to the boom at Point B is m,
draw the FBD and KD that could be used to determine the horizontal and
vertical forces at B.
PROBLEM 12.F11
Disk A rotates in a horizontal plane about a vertical axis at the constant
rate 0.
Slider B has a mass m and moves in a frictionless slot cut in
the disk. The slider is attached to a spring of constant k, which is
undeformed when r 0. Knowing that the slider is released with no
radial velocity in the position r r0, draw a FBD and KD at an arbitrary
distance r from O.
PROBLEM 12.F12
Pin B has a mass m and slides along the slot in the rotating arm
OC and along the slot DE which is cut in a fixed horizontal
plate. Neglecting friction and knowing that rod OC rotates at
the constant rate 0,
draw a FBD and KD that can be used to
determine the forces P and Q exerted on pin B by rod OC and
the wall of slot DE, respectively.
