Question

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 it just begins to move? Assume g = 9.81 m/s2. Magnitude of largest force =

Answer #1

Answer

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 factory worker exerts a 100 N horizontal pushing force on a
70.0 kg box that is initially at rest on the floor. The coefficient
of static friction is 0.2 and the coefficient of kinetic friction
is 0.1. The force of friction acting on the box is equal to:

A person pushes a 20.3-kg shopping cart at a constant velocity
for a distance of 36.2 m on a flat horizontal surface. She pushes
in a direction 25.1 ° below the horizontal. A 44.5-N frictional
force opposes the motion of the cart. (a) What is
the magnitude of the force that the shopper exerts? Determine the
work done by (b) the pushing force,
(c) the frictional force, and (d)
the gravitational force.

A person pushes a 24.6-kg shopping cart at a constant velocity
for a distance of 21.1 m on a flat horizontal surface. She pushes
in a direction 33.6 ° below the horizontal. A 32.4-N frictional
force opposes the motion of the cart. (a) What is the magnitude of
the force that the shopper exerts? Determine the work done by (b)
the pushing force, (c) the frictional force, and (d) the
gravitational force.

A person pushes a 11.2-kg shopping cart at a constant velocity
for a distance of 15.9 m on a flat horizontal surface. She pushes
in a direction 30.5 ° below the horizontal. A 31.2-N frictional
force opposes the motion of the cart. (a) What is the magnitude of
the force that the shopper exerts? Determine the work done by (b)
the pushing force, (c) the frictional force, and (d) the
gravitational force.

A woman exerts a horizontal force of 107 N on a box with a mass
of 40.2 kg.
(a)
If the box doesn't move, what's the magnitude of the static
friction force (in N)?
N
(b)
What is the minimum possible value of the coefficient of static
friction between the box and the floor? (Assume the box remains
stationary.)

A boy exerts a horizontal force of 119 N on a box with a mass of
30.7 kg.
(a)
If the box doesn't move, what's the magnitude of the static
friction force (in N)?
N
(b)
What is the minimum possible value of the coefficient of static
friction between the box and the floor? (Assume the box remains
stationary.)

A person pushes a 16.0-kg shopping cart at a constant velocity
for a distance of 16.0 m. She pushes in a direction 21.0° below the
horizontal. A 46.0-N frictional force opposes the motion of the
cart.
(a) What is the magnitude of the force that the shopper
exerts?
____N
(b) Determine the work done by the pushing force.
____ J
(c) Determine the work done by the frictional force.
____ J
(d) Determine the work done by the gravitational force....

A horizontal force of magnitude 32.5 N pushes a block of mass
4.05 kg a distance of 3.00 m across a floor, where the coefficient
of kinetic friction is 0.600.
(a) How much work is done by that applied force on the
block-floor system?
(b) During that displacement, the thermal energy of the block
increases by 36.0 J. What is the increase in thermal energy of the
floor?
(c) What is the increase in the kinetic energy of the block?

A 100 kg person pushes a box up a ramp at constant speed. The
mass of the box is 30 kg, the coefficient of kinetic friction
between the box and the ramp is 0.2, and the ramp is inclined 25
degrees above the horizontal. The person (new at pushing boxes up
ramps) pushes purely in the horizontal direction. HINT: you must
draw complete FBDs to receive full credit.
a) Find an expression for the magnitude of the normal force on...

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