Homework Answers
Force exerted by A on C is FfC = us*mC*g
Force exerted by A on B is fricition force
FfB = us.N =us.(mA+mC)*g
us(mA+mC)*g > us(mC)*g
(mA+mC) >mC
FfB > FfC
Horizontal force by A on B is greater than A on C
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Why the answer is c?
In the figure below, all surfaces experience friction. An external force...
Problem 4 (kinetics) The coefficients of friction between blocks A and C and the horizontal surfaces...
Problem 4 (kinetics) The coefficients of friction between blocks A and C and the horizontal surfaces are u, 0.24 and u=0.20. Knowing that mA = 5 kg,mg = 10 kg, and me = 10 kg, determine (a) the tension in the cord, (b) the acceleration of each block. Answers: (a) 33.6 N.(b) a A=4.76 m/s2, ag=3.08 m/s2, and a = 1.4 m/s2
NTSB-QRT19: STUDENT PUSHES TWO SLOWING BLOCKS-FORCE ON BLOCK A student pushes the two blocks to the...
NTSB-QRT19: STUDENT PUSHES TWO SLOWING BLOCKS-FORCE ON BLOCK A student pushes the two blocks to the right. Block A has more mass than block B There is friction between the blocks and the table. (i) For the situation where the blocks are slowing down, which of the following statements is true about the magnitude of the forces a) The force that block exerts on block is greater than the force that block exerts on block b) The force that block....
The coefficients of friction are ?? = 0.4 between all surfaces of contact. Assuming the pulley...
The coefficients of friction are ?? = 0.4 between all
surfaces of contact. Assuming the
pulley is frictionless,
a. Determine the smallest force P required to start the 45-kg block
moving if the cable is
attached as shown.
b. Determine the smallest force P required to start the 45-kg block
moving if the cable is
removed from the blocks. Will block A slip with respect to block B
or will it move
with block B?
The coefficients of friction are...
nT5B-CT20:Ropes Pulling Boxes Ill-Rope Tension Shown below are boxes that are being pulled by a force...
nT5B-CT20:Ropes Pulling Boxes Ill-Rope Tension Shown below are boxes that are being pulled by a force Falong frictionless surfaces, accelerating toward the left. The masses of the boxes are indicated in each figure. Will the tension in rope A on the left be a greater than. (b) less than, (e) equal, or (dl) indeterminate compared to the tension in rupe B on the right? Explain T Force 1 NTSB-QRT17: SKATEBOARD RIDER COASTING DOWN A HILL-ACCELERATION AND NET FORCE At the...
The figure below shows an initially stationary block of mass m on a floor
The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.550mg is then applied at upward angle θ = 24°. (a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μs = 0.610 and μk = 0.505? (b) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μs = 0.395 and μk...
Now suppose A and B are blocks of ice, so that friction between them and the...
Now
suppose A and B are blocks of ice, so that friction between them
and the floor is negligibly small. They are moving to the left, and
the worker pushes to the right on them with a force of 300 N,
causing them to slow to a stop.
(A) Is the magnitude of the force that crate B exerts on crate A
greater than, equal to, or less than 300 N?
(B) Is the magnitude of the force that crate...
2) Rita is in an elevator that is moving at a constant velocity downward. If the...
2) Rita is in an elevator that is moving at a constant velocity downward. If the elevator now experiences an acceleration so that it speeds up, the normal force Rita experiences A) becomes greater than her weight. B) remains equal to her weight. C) becomes less than her weight, but not equal to zero. D) becomes zero. E) cannot be determined without more information. 11) A rope connects object A (mass 4m) with object B (mass m). (Object A is...
Consider the two adjacent blocks shown in the figure below. A horizontal external force, F, is...
Consider the two adjacent blocks shown in the figure below. A
horizontal external force, F, is applied rightward to the small
block on the left. The horizontal surface on which the blocks slide
is frictionless. If M = 1.0 kg and F = 16.7 N, determine magnitude
of the force applied by the small block onto the large block.
4M
A player shoots a basketball as shown below. Points S and Q are at the same...
A player shoots a basketball as shown below.
Points S and Q are at the same height and R is at the top of the
trajectory. All statements refer to the basketball. Coordinate
system: the x-axis is horizontal and points to the
right, the y-axis is vertical and points up.
(Neglect air friction.)
greater than less than equal to The x-component of the
velocity at R is .... that at S.
greater than less than equal to The acceleration at S is...
A Friction Experiment During an experiment, a crate is pulled along a rough horizontal surface by a force F⃗ a...
A Friction Experiment
During an experiment, a crate is pulled along a rough horizontal
surface by a force F⃗ and the magnitude of the
acceleration along the x direction, ax ,
is measured.(Figure 1) The vector F⃗ has a component along
the x direction of magnitude Fx . The
experiment is repeated several times, with different values of
Fx each time, while maintaining a constant value
for, Fy , the vertical component of F⃗
.
Part A
Create a plot...
Problem 4 (kinetics) The coefficients of friction between blocks A and C and the horizontal surfaces are u, 0.24 and u=0.20. Knowing that mA = 5 kg,mg = 10 kg, and me = 10 kg, determine (a) the tension in the cord, (b) the acceleration of each block. Answers: (a) 33.6 N.(b) a A=4.76 m/s2, ag=3.08 m/s2, and a = 1.4 m/s2
NTSB-QRT19: STUDENT PUSHES TWO SLOWING BLOCKS-FORCE ON BLOCK A student pushes the two blocks to the right. Block A has more mass than block B There is friction between the blocks and the table. (i) For the situation where the blocks are slowing down, which of the following statements is true about the magnitude of the forces a) The force that block exerts on block is greater than the force that block exerts on block b) The force that block....
The coefficients of friction are ?? = 0.4 between all
surfaces of contact. Assuming the
pulley is frictionless,
a. Determine the smallest force P required to start the 45-kg block
moving if the cable is
attached as shown.
b. Determine the smallest force P required to start the 45-kg block
moving if the cable is
removed from the blocks. Will block A slip with respect to block B
or will it move
with block B?
The coefficients of friction are...
nT5B-CT20:Ropes Pulling Boxes Ill-Rope Tension Shown below are boxes that are being pulled by a force Falong frictionless surfaces, accelerating toward the left. The masses of the boxes are indicated in each figure. Will the tension in rope A on the left be a greater than. (b) less than, (e) equal, or (dl) indeterminate compared to the tension in rupe B on the right? Explain T Force 1 NTSB-QRT17: SKATEBOARD RIDER COASTING DOWN A HILL-ACCELERATION AND NET FORCE At the...
Now
suppose A and B are blocks of ice, so that friction between them
and the floor is negligibly small. They are moving to the left, and
the worker pushes to the right on them with a force of 300 N,
causing them to slow to a stop.
(A) Is the magnitude of the force that crate B exerts on crate A
greater than, equal to, or less than 300 N?
(B) Is the magnitude of the force that crate...
2) Rita is in an elevator that is moving at a constant velocity downward. If the elevator now experiences an acceleration so that it speeds up, the normal force Rita experiences A) becomes greater than her weight. B) remains equal to her weight. C) becomes less than her weight, but not equal to zero. D) becomes zero. E) cannot be determined without more information. 11) A rope connects object A (mass 4m) with object B (mass m). (Object A is...
Consider the two adjacent blocks shown in the figure below. A
horizontal external force, F, is applied rightward to the small
block on the left. The horizontal surface on which the blocks slide
is frictionless. If M = 1.0 kg and F = 16.7 N, determine magnitude
of the force applied by the small block onto the large block.
4M
A player shoots a basketball as shown below.
Points S and Q are at the same height and R is at the top of the
trajectory. All statements refer to the basketball. Coordinate
system: the x-axis is horizontal and points to the
right, the y-axis is vertical and points up.
(Neglect air friction.)
greater than less than equal to The x-component of the
velocity at R is .... that at S.
greater than less than equal to The acceleration at S is...
A Friction Experiment
During an experiment, a crate is pulled along a rough horizontal
surface by a force F⃗ and the magnitude of the
acceleration along the x direction, ax ,
is measured.(Figure 1) The vector F⃗ has a component along
the x direction of magnitude Fx . The
experiment is repeated several times, with different values of
Fx each time, while maintaining a constant value
for, Fy , the vertical component of F⃗
.
Part A
Create a plot...
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