Question

12. A box is stationary on the floor. Consider the following forces

A. a downward force from the earth on the box

B. an upward force from the floor on the box

C. An upward force from the box on the earth

D. a downward force from the box on the floor

Which two pairs of forces constitute an action-reaction pair?

a. A and B b. B and D c. C and D d. A and C

13. The stability of an object increases when its

a. center of gravity is closer to its support and its area of support is small

b. center of gravity is closer to its support and its area of support is large

c. center of gravity is farther from its support and its area of support is large

d. center of gravity is farther from its support and its area of support is large

14. The force friction acting on an object

a. is directed along its direction of motion

b. is directed against its direction of motion

c. is directed along the normal force

d. can have different directions

15. The coefficient friction between the tires on a car and the
road is 0.3 If a car of mass 800 kg is accelerating along a
straight, horizontal road at 2 m/s^{2}.

The force of friction on the car is

a. 240 (N) b. 1600 (N) c. 2400 (N) d. 4000 (N)

16. The net force on the car is

a. 0 (N) b. 1600 (N) c. 2400 (N) d. 4000 (N)

17. The force pushing the car forward is

a. 1600 (N) b. 2400 (N) c. 4000 (N) d. 5600 (N)

18. A hockey puck of mass 150 grams is at rest on the ice rink when it is hit with a force of 20 N. If the force of friction that acts on the puck from the ice is 0.075 N, what is the coefficient of friction between the puck and ice?

- 0 because it is on Ice b. .005 c. .05 d. .5

Answer #1

A 48.0-kg box is being pushed a distance of 6.04 m across the
floor by a force P whose magnitude is 162 N. The force P is
parallel to the displacement of the box. The coefficient of kinetic
friction is 0.206. Determine the work done on the box by (a) the
applied force, (b) the friction force, (c) the normal force, and
(d) by the force of gravity. Be sure to include the proper plus or
minus sign for the...

A box is pushed a horizontal distance of 3.00 m with a force of
200.0 N. The friction force between the floor and the box is 150.0
N.
(a) How much work is done by pushing the box? Answer Answer
(b) How much work does the friction force do? Answer Answer
(c) How much work does the force of gravity do? Answer Answer
(d) How much is the net work?

A 36.5 kg box initially at rest is pushed 4.25 m along a rough,
horizontal floor with a constant applied horizontal force of 150 N.
If the coefficient of friction between box and floor is 0.300, find
the following.
(a) the work done by the applied force
J
(b) the increase in internal energy in the box-floor system due to
friction
J
(c) the work done by the normal force
J
(d) the work done by the gravitational force
J...

A 10.0kg box accelerates across the floor at 1.5m/s^2 when
pulled by a force of 20N acting horizontally, The same box is then
pulled by the same force acting at an elevation of 40 degrees.
A. Draw the free-body diagrams for both situations.
B. Determine the coefficient of sliding friction.
C. Calculate the acceleration of the box if the force is directed
at 40 degrees above the horizontal. Draw the free-body diagram for
this situation.

A top-heavy box that is 1.0 m long and 1.5 m tall and very thin,
has its center of gravity located 1.25 m from the ground 0.25 m to
the left of the center of the box. The coefficient of static
friction between the box and floor is 0.40. If someone exerts a
force horizontally to the right along the top of the box, will the
box tip or slip first?

1) You are making a circular turn in your car on a horizontal
road when you hit a big patch of ice, causing the force of friction
between the tires and the road to become zero. While the car is on
the ice, itA) moves along a straight-line path away from the center of the
circle.B) moves along a straight-line path toward the center of the
circle.C) moves along a straight-line path in its original
direction.D) continues to follow a...

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...

As shown in the figure below, a box of mass
m = 64.0 kg
(initially at rest) is pushed a distance
d = 80.0 m
across a rough warehouse floor by an applied force of
FA = 222 N
directed at an angle of 30.0° below the horizontal. The
coefficient of kinetic friction between the floor and the box is
0.100. Determine the following. (For parts (a) through (d), give
your answer to the nearest multiple of 10.)
(a)
work...

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...

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...

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