Question

1. For a huge luxury liner to move with constant velocity, its
engines need to supply a forward thrust of
6.75 10^{5} N. What is the magnitude of the
resistive force exerted by the water (in N) on the cruise ship?

2.

You are helping your friend move a new refrigerator into his
kitchen. You apply a horizontal force of 272 N in the negative
*x* direction to try and move the 62 kg refrigerator. The
coefficient of static friction is 0.64.

(a) How much static frictional force does the floor exert on the refrigerator? Give both magnitude (in N) and direction.

magnitude & direction

(b) What maximum force (in N) do you need to apply before the refrigerator starts to move?

3. A flatbed truck is supported by its four drive wheels, and is
moving with an acceleration of 6.6 m/s^{2}. For what value
of the coefficient of static friction between the truck bed and a
cabinet will the cabinet slip along the bed surface?

*μ*_{s} <

4. (a) What is the maximum frictional force (in N) in the knee joint of a person who supports 59.0 kg of her mass on that knee if the coefficient of static friction is 0.016?

(b) During strenuous exercise, it is possible to exert forces to the joints easily ten times greater than the weight being supported. What is the maximum force of friction (in N) under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain. Assume that the coefficient of kinetic friction in the joint is 0.015.

5. A 6 kg block slides down a ramp which is at an incline of
40°. If the frictional force is 5.40 N, what is the coefficient of
friction? Assume * g* = 10 m/s

At what incline (measured in degrees) will the box slide at a constant velocity?

Answer #1

A 5 kg block rests on a flat surface with a coefficient of
static friction of 0.5 and a coefficient of kinetic friction of
0.3.A force of 20 N pushes on the block does not move . what is the
magnitude of the frictional force on the block

A crate with a mass of 3.00 kg starts from rest at the top of a
28.0° incline and slides 2.00 m down the incline in 1.25 s.
(a) What is the magnitude of the acceleration of the crate (in
m/s2)?
2.56 m/s2 correct
b) What is the frictional force (in N) acting on the crate?
(Enter the magnitude.)
(c) What is the coefficient of kinetic friction between the
crate and the incline?
(d) What is the speed of the...

A crate of 31.6-kg tools rests on a horizontal floor. You exert
a gradually increasing horizontal push on it and observe that the
crate just begins to move when your force exceeds 309 N . After
that you must reduce your push to 248 N to keep it moving at a
steady 22.0 cm/s
What is the coefficient of static friction between the crate and
the floor?
What is the coefficient of kinetic friction between the crate
and the floor?...

A box rests on top of a flat bed truck. The box has a mass of m
= 18 kg. The coefficient of static friction between the box and
truck is μs = 0.8 and the coefficient of kinetic
friction between the box and truck is μk = 0.61.
1)The truck accelerates from rest to vf = 17 m/s in t
= 13 s (which is slow enough that the box will not slide). What is
the acceleration of the...

You are holding a 1.5 kg book motionless against a vertical wall
by pressing on it, with your arm pushing with a force of 14 N at an
angle of 25 degrees upward from
the horizontal. You are also taking static friction into account,
such that the maximum static friction force is in
effect.
a. There are two other forces
acting on the book, Name them.
b. Draw a force diagram
labeling all forces on the book.
c. What should...

Say you push on a 5 kg block with a force of
Fa = 20 N, at a 45° angle downward. The
coefficient of kinetic friction between the block and the ground is
?k = 0.3. The coefficient of static friction is unknown,
but it is known that ?s > 0.3. The block is moving
with initial velocity to the right (the +x direction),
v0 = 2 m/s.
a) What is the magnitude of the force of friction on the...

2. A father tries to pick up his son who weighs 60N. He applies
an upward force of 40N on the boy. Which statement best describes
the force experienced by the father from the boy? A. It is greater
than 40 N
B. It is equal to 40 N
C. It is less than 40 N
D. The boy does not exert a force on the father
3. You push an 11 kg box to the right with a 33...

1. A box is at rest on a flat table. Which of the following is
true?
a. The normal force and the gravitational force are equal in
magnitude and opposite in direction.
b. The magnitude of normal force depends on the coefficient of
static friction between the book and the table.
c. Gravity exerts a force on the box that depends on how big the
normal or support force is.
d. The normal force and the gravitational force are an...

incline01_block1+rope+friction.problem
Block 1 (20 kg) is pulled by a rope from
left to right up a ramp which is inclined
50 degrees from the horizontal. The rope pulls on
block 1 with a force of 300 N parallel to the
surface of the inclined plane. The coefficient of kinetic
friction between the block and the surface equals
0.1.
On a sheet of paper, draw the free body diagram
for block 1 using the two-subscript notation from class. Assume
that the...

Learning Goal:
To use the principle of linear impulse to determine
the change in velocity of a box subject to multiple
forces.
The block shown in (Figure 1) has mass m = 48 kg and
is subjected to forces F1 = 300 N at an angle θ = 40 ∘ below the
horizontal and F2 = 60 N . The coefficient of kinetic friction
between the box and the surface is μk = 0.15. What is the velocity
of the...

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