Question

A
5.00 kg block sits on the floor at rest. You pull on a rope upwards
at an angle. The coefficient of static friction is 0.400 and the
coefficient of kinetic friction is 0.300. When you pull upwards
with a force of 20.0 N at an angle of 35.0°, what is the force of
friction on the box? What is the acceleration of the box?

Answer #1

20.0-kg block initially sits at rest on a rough horizontal
floor. One end of a string is attached to the block. You pull on
the other end of the string with a force of 40.0 N so that the
string makes an angle of 30.0° with the horizontal. After pulling
the block 3.00 m across the floor, it is traveling with a speed of
1.25 m/s. What is the magnitude of the force of kinetic friction
exerted on the block...

A
7.00 kg block sits on the floor at rest. Block is being pulled
across a frictionless floor with a force F=14 N at an angle of 35
degrees. What is the magnitude of block’s acceleration?

Chapter 08, Problem 045
A rope is used to pull a 5.16 kg block at constant speed 6.62 m
along a horizontal floor. The force on the block from the rope is
4.47 N and directed 10.5° above the horizontal. What are
(a) the work done by the rope's force,
(b) the increase in thermal energy of the
block-floor system, and (c) the coefficient of
kinetic friction between the block and floor?

A rope is used to pull a box which has a mass of 2.03 kg above
the floor as far as 4.56 m. The force of the rope F is 6 N in a
direction that has an angle of 33.1 degrees above the floor
surface.
a. How much work does F do?
b. What is the increase in thermal energy in a box-floor
system?
c. What is the kinetic friction coefficient between the box and the
floor?

a large box whose mass is 20.0 kg rests on the frictionless
floor. A mover pushes on the box with a force of 250 N at an angle
35.0 below the horizontal. Draw the box's free body diagram and
calculate the acceleration of the box
b) if the kinetic friction coefficient is 0.1 between the box
and floor. Draw the box's free body diagram and re-calculate the
acceleration of the box

1) Two movers use ropes to pull a heavy box horizontally across
a level floor. One pulls with a force of 175.0 N at 20.0 degrees
North of East, while the other pulls with 200.0 N at 10.0 degrees
West of North. The box has a mass of 125.0 kg, and has coefficients
of friction (with the floor) static= 0.350 kinetic= 0.220. a) In
what direction is the friction force acting? b) The box is
initially stationary. What is its...

A 3.0-kg block sits on top of a 5.0-kg block which is on a
horizontal surface. The 5.0-kg block is pulled to the right with a
force F⃗ . The coefficient of static friction between all
surfaces is 0.60 and the kinetic coefficient is 0.37.
a) What is the minimum value of F
needed to move the two blocks?
b) If the force is 10% greater than your answer for (a), what is
the acceleration of each block?

You are using a rope to pull a box across a hardwood floor at
constant speed.
a) Is the box in mechanical equilibrium? Explain.
b) Is the box accelerating? How do you know?
c) The mass of the box is 14 kg. The normal force exerted on the
box by the ground is 120 N, and the friction force between the box
and the floor is 20 N. What is the tension in the rope?
d) Sketch a force diagram...

A rope that is directed 30° above the horizontal, is exerting a
10.0-N force to pull a 5.0-kg block at constant speed along a 5.0-m
horizontal floor. After drawing the free-body diagram find:
the magnitude of the normal force from the floor on the block
the magnitude of the force of friction
the work done by the rope's force
the increase in the thermal energy of the block-floor system
the coefficient of kinetic friction between the block and
floor.

. A 15.0 kg bookshelf is sitting in an elevator
that is accelerating upwards at 1.4 m/s2. A student
pushes the bookshelf horizontally with a force of 45.0 N. What is
the horizontal acceleration of the bookshelf if the coefficient of
static friction between the floor and the bookshelf is 0.25, and
the coefficient of kinetic friction is 0.15?

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