Question

**QUESTION 1**

1. Friction is a force acting in a ___________ direction of
motion

to. perpendicular

b. opposite

c. to the weight of the object

d. None of the above

**QUESTION 2**

1. When the speed of a mobile phone doubles, what happens to its
kinetic energy?

to. Quadruples

b. Doubles

c. It does not change

d. It is cut in half

**QUESTION 3**

1. The main difference between the kinetic energy KE and the
gravitational potential energy PE is that

to. KE depends on position and PE depends on movement

b. KE depends on movement and PE depends on position

c. although both are energy that depend on movement, only the KE
depends on the position

d. although both are energy depending on the position only the PE
depends on the movement

**QUESTION 4**

1. The Uniform Circular Movement is accelerated.

to. only when it doesn't always go as fast.

b. because it changes the size of the radius during the
trajectory.

c. because it changes the size of the velocity vector.

d. because it changes the direction of the velocity vector.

**QUESTION 5**

1. If in the laboratory simulation a centripetal force a body turns
180 revolutions 1 min. Her period is

a. 9 s

b. 18 s

c. 0.33 s

d. 1.33 s

Answer #1

true or false:
1-The direction of kinetic friction force is opposite to the motion
of the particle.
2-The vertical force on the displacement of the body
does not work.
3-The direction of kinetic friction force is in the
direction of the particle's motion.
4-Flexibility is the resistance of solid objects to
change in shape or size when exposed to stress.
5-Ying's modulus of a substance depends on the type of
material only and works in the linear region.

1. For an object moving in uniform circular motion, does the
centripetal force do work on the object?
A.
Yes, because work is force times distance and the object is
moving from the force.
B.
No, because the force is always perpendicular to the object's
displacement.
C.
No, because the displacement of the object is zero.
D.
Yes, because the object is moving.
2. An object is moving along a straight line with a speed of v
when it hits...

1. An object-spring system moving with simple harmonic motion
(SHM) has an amplitude A.
(a) What is the total energy of the system in terms of k and A
only?
(b) Suppose at a certain instant the kinetic energy is twice the
elastic potential energy, KE = 2PE. Re-write this equation by using
only the variables for the mass, m, velocity, v, spring constant,
k, and position, x.
(c) Using the results of (a) and (b) and conservation of energy,...

On friction between two given surfaces: ____.
a) the kinetic frictional force is always in the direction
opposite to the direction of motion
Yes/No
b) if you slightly push one surface relative to another without
actually moving it, the resultant static friction force is always
equal to the coefficient of static friction times the normal
force
Yes/No
c) the coefficient of kinetic friction depends on the smoothness
of the surfaces
Yes/No
d) the magnitude of the frictional force cannot be...

Cart A has a mass of 5 kg and is moving in the
+x direction at 2 m/s. Cart B has a mass of 2 kg
and is moving in the +y direction at 5 m/s.
Do the two carts have the same momentum? Explain.
Yes, they both have a momentum of magnitude 10.
No, they do not have the same momentum because they move in
different directions.
Is the magnitude of the momentum of each cart the same?
Explain....

answer all questions
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is 279 meters...

8 through 10 done please!!
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is...

just do questions 5 through 10
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill...

1) The combination of an applied force and a friction force
produces a constant total torque of 35.8 N · m on a wheel rotating
about a fixed axis. The applied force acts for 5.90 s. During this
time, the angular speed of the wheel increases from 0 to 10.1
rad/s. The applied force is then removed, and the wheel comes to
rest in 60.1 s.
(a) Find the moment of inertia of the wheel.
kg · m2
(b) Find...

Question 1 (1 point)
Which is not necessary in order to do work on an object (use the
scientific definition of work)?
Question 1 options:
There must be a change in momentum.
A net force must be applied to the object.
The object must undergo a displacement.
A component of the force must be in the direction of motion.
Question 2 (1 point)
The change in gravitational potential energy for a 1.9 kg box
lifted 2.2 m is:
Question 2...

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