Question

For Each Question:

- Mark As True or False

- Give Reason

- Prove Your Answer By An Example

1. The magnitude of the average velocity is not the average
speed.

2. The magnitude of the instantaneous velocity is the
instantaneous speed.

3. The word deceleration means always slowing down.

4. The acceleration of a projectile at the top of its
trajectory is zero. While the velocity at the top of the motion of
an object thrown upward momentarily goes to zero.

5. The normal force generally has the same magnitude as the
gravitational force.

6. The two forces acting on the same object, even if they are
equal in magnitude and opposite in direction, cannot be an
action–reaction pair.

7. In an infinitesimal time interval, the magnitude of the
displacement is equal to the distance traveled by the
particle.

8. The description of an object under the effect of forces
that balance is covered by Newton’s first law .

9. The gravitational acceleration (g = 9.8 m /s2 ) may be a
positive or negative number.

10.There is no single value of the moment of inertia for an
object and there is no unique value of the torque.

Answer #1

-According to Newton’s First Law, which of the following
statements is true?
a) If an object is in motion, then a force is acting on it.
b) A force is necessary to change the motion of an object.
c) If an object is stationary, then no forces are acting on
it.
d) An object in motion must have an acceleration.
-If an object is in motion, can its acceleration be zero?
-If an object’s acceleration is zero, does that mean...

Question 1: Mark True or False beside each
statement below:
_______(a) The center of mass (gravity) of any object must lie
on a point within or on the body of each
object.
_______(b) The torque due to a force is independent of
the choice of axis of rotation.
_______(c) If the forces on an object balance, then this object
cannot experience any rotation.
_______(d) If the torques on an object balance, then this object
cannot have angular acceleration.
_______(e) If...

1. Triple the net force on an object is :
mass triples.
acceleration triples.
velocity triples.
2. As you walk along a level floor, the friction force acting on
your feet points in what direction?
In the direction of your motion
Down
Up
Cannot decide from the given information
Opposite to the direction of your motion
speed triples.
momentum triples.
3. Let m be your mass. When you are standing up, the
normal force acting on you from the floor...

1. For a stationary ball of mass m = 0.200 kg hanging from a
massless string, draw arrows (click on the “Shapes” tab) showing
the forces acting on the ball (lengths can be arbitrary, but get
the relative lengths of each force roughly correct). For this case
of zero acceleration, use Newton’s 2nd law to find the
magnitude of the tension force in the string, in units of Newtons.
Since we will be considering motion in the horizontal xy plane,...

Question 1
The study of Uniform Circular Motion relates to objects
traveling with constant speed around a circle with radius, R. Since
the object has a constant speed along a circular path, we can also
say that
A)
the object has zero velocity.
B)
the object has a constant acceleration magnitude.
C)
the object has zero acceleration.
D)
the object has a constant velocity.
E)
the object has an increasing acceleration.
Question 2
Uniform Circular Motion (UCM) problems are just...

True or False:
The force in work is the magnitude of the constant force.
T________ F______
When pulling a chest across the floor with a rope tied to the
end, the work increases as the angle decreases towards the
horizontal plane of the floor. T_______ F________
The less the displacement of the apple when pushed across the
desk, the less work that is done. T_____F_____
The work to push the same chair across a surface of 10 m in
distance,...

We learned in mechanics that in the absence of air resistance,
all objects near Earth’s surface fall with the same constant
acceleration g = 9.8 m/s 2 . Yet as a student I once dropped a
wadded-up tissue from the top of the Eiffel Tower and watched it
take minutes to fall 300 m to Earth. (I retrieved it from the
riverbank and put it in the poubelle.) In fluids, such as air or
water, frictional drag forces grow larger...

1. Usain Bolt sprints along the track, with his feet pushing
down and behind him. Therefore the track actually pushes Usain Bolt
along the track. Group of answer choices True or False
2.You study two objects in motion, Object J and Object S. Each
object has its own velocity graph, with same time and velocity
scales. The slope of each graph is positive, upward and to the
right ⁄ but Object J's tilt angle is only 10º and Object
S's tilt...

1. Motion of an object depends on its velocity only.
True
False
2. A car with a mass of 2500 kg is traveling at a speed of 30 m/s
due east. Choose the most appropriate answer to its momentum.
a. 30 m/s due east
b. 30 m/s
c. 75,000 kgm/s
d. 75,000 kgm/s due east
3. A car is traveling at 70 mph and then is involved in an accident
with a head-on collision into a very solid wall. As...

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...

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