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 person pushes on a 58-kg refrigerator with a horizontal force
of -275 N; the minus sign indicates that the force points in the −x
direction. The coefficient of static friction is 0.55.
(a) If the refrigerator does not move, what are the magnitude
and direction of the static frictional force that the floor exerts
on the refrigerator? Static frictional force =
(b) What is the magnitude of the largest pushing force that can
be applied to the refrigerator before...

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 person pushes on a 74 kg refrigerator by a horizontal force of
215 N. (Assume the push is in the +x-direction.)
#1) If the coefficient of static friction is 0.65, what are the
magnitude (in N) and the direction (in degrees counterclockwise
from the +x-axis) of the force of the static friction?
Does the person move the refrigerator?
#2) What is the magnitude (in N) of the largest push that the
person can apply to the refrigerator just before...

A student decides to move a box of books into her dormitory room
by pulling on a rope attached to the box. She pulls with a force of
156 N at an angle of 27.0° above the horizontal. The box has a mass
of 20.0 kg, and the coefficient of kinetic friction between box and
floor is 0.300.
(a) Find the acceleration of the box. ____m/s2
(b) The student now starts moving the box up a 10.0° incline,
keeping her...

Suppose you have to move a heavy crate of
weight 875
N by sliding it along a horizontal concrete
floor. You push the crate to the right with a horizontal force of
magnitude 300
N, but friction prevents the crate from
sliding. What is the
magnitude
Fp of
the minimum force you need to exert on the crate to make it start
sliding along the floor? Let the coefficient of static
friction ?s between the crate and the floor be...

A
student is attempting to move a 31-kg mini-fridge into her dorm
room. During a moment of inattention, the mini-fridge slides down a
35 degree incline at constant speed when she applies a force of 25
N acting up and parallel to the incline. What is the coefficient of
kinetic friction between the fridge and the surface of the
incline?
μk=μk=
A
car rounds an unbanked curve of radius 95 m. If the coefficient of
static friction between the road...

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...

A box (400 kg) sits inside the trailer of a
semitruck traveling at a speed of 20 m/s (~ 44
mph). Suddenly, a car in front of the truck stops in the road. The
driver of the truck hits the brakes to bring the truck to a stop.
Assume that the coefficient of static friction
µs = 0.7 between the box and the floor of the
trailer. Assume g = 10 m/s2.
When the truck slows down while traveling left,...

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