1
Created by Boundless
Torque is the force that causes objects to
A
move linearly without acceleration
B
move linearly with acceleration
C
turn or rotate
D
deform
2
Created by Boundless
The SI units of torque are
A
Newtons
B
newton-meters
C
meters
D
Joules
3
Created by Boundless
The following is correct for an object in equilibrium:
A
the net force and net torque in any particular direction are
equal to zero
B
the net torque is never equal to zero
C
the net torque is equal to zero only when the net force is
not equal to zero
D
4
the net force is never equal to zero
Created by Boundless
The first condition of equilibrium states that the net force
A
is equal to zero in one direction only
B
must be equal to zero in all directions
C
can not be equal zero in all directions
D
is not equal to zero in one direction only
5
Created by Boundless
The second condition of static equilibrium says that the net torque acting on the
object
A
must be equal to zero
B
approaches infinity
C
is relatively small
D
can not be equal to zero
6
Created by Boundless
For a single object to be in the static equilibrium, the following conditions should
be matched:
A
The net external force on the object is zero and net external
torque is also zero
B
The net external force on the object is positive while net
external torque is equal to zero
C
The net external force on the object is non-zero while net
external torque is equal to zero
D
The net external force on the object is equal to zero while
net external torque is positive
7
Created by Boundless
Stability of an equilibrium can be determined by the
A
second derivative of the potential
B
integration of the potential
C
first derivative of the potential
D
sum of all potentials
8
Created by Boundless
Position of center of mass is defined as the
9
A
weighted average of all the particles in the system
B
particle with the smallest mass
C
position of static equilibrium
D
particle with the largest mass
Created by Boundless
When solving static problem, you should start with
A
solving the equation for unknown
B
choosing a pivot point
C
double-checking that a problem involves no acceleration
D
writing an equation for the sum of torques
10
Created by Boundless
When solving static problem, the last step is to
A
check if the solution is reasonable by examining the
magnitude, direction, and units of the answer
B
solve the equations for unknowns
C
insert numbers to find the final answer
D
double-check that it is a static problem
11
Created by Boundless
A static problem is a problem that involves
A
only angular acceleration
B
linear acceleration
C
no acceleration
D
all types of acceleration except angular
12
Created by Boundless
Which of the following is common example of a simple machine?
A
Lever
B
All of these answers
C
Wedge
D
Screw
13
Created by Boundless
What term describes a device with a specific movement?
A
An arm
B
A pivot
C
A joint
D
A mechanism
14
Created by Boundless
Which common simple machine is used a wheelbarrow?
A
Inclined plane
B
Wedge
C
Lever
Wheel and axle
D
15
Created by Boundless
How does a pinned arch differ from a fixed arch?
A
The pinned arch is most often used in reinforced concrete
bridge construction
B
The pinned arch cannot rotate
C
The pinned arch more statically indeterminate than the
fixed arch
D
The pinned arch compensates for thermal expansion and
contraction
16
Created by Boundless
In which situation are pendentives employed?
A
When a dome is made of concrete
B
When a dome is on a square structure
C
When a dome resembles an arch that has been rotated
around a central vertical axis
D
When a dome resembles the hollow half of a sphere
17
Created by Boundless
What causes 'tennis elbow'?
A
The routine application of force and torque revive muscles
and joints
B
The constant extension creates large forces on the joints
and tendons in the elbow
C
The input force is much greater than the output source
D
The muscles attached to bones have a mechanical
advantage much less than one
18
Created by Boundless
What is the reason for having skeletal muscles attached close to joints?
A
The muscles can only contract, so they need to be close to
one another
B
The muscles can expand beyond their resting length
C
The muscles output force is much greater than the input
force
D
The muscles can work as a simple machine
19
Created by Boundless
Why do physical therapists have patients perform exercise underwater?
20
A
Less exertion of force is gentle on damaged muscles
B
Less exertion of force minimizes fatigue to the body
C
Greater exertion of force strengthens muscles
D
Greater exertion of force minimizes short-term damage to
the body
Created by Boundless
Fracture strength is usually determined for a given specimen by a
A
conductivity test
B
resistance test
C
indentation test
D
tensile test
21
Created by Boundless
Strain placed on an object such that it deforms beyond its elastic limit will cause
object to
A
permanently deform and eventually fracture
B
bend and then return to its original shape when the force is
abated
C
deform inelastically
D
deform elastically
22
Created by Boundless
Objects that are very elastic
A
have high elasticity and fracture easily
B
have high elasticity and stretch easily
C
have low elasticity and stretch easily
D
have low elasticity and stretch easily
23
Created by Boundless
Stress is
A
the change in length divided by the original length of the
object
B
measure of how difficult it is to stretch an object
C
a measure of the force put on the object over the length
D
a measure of the force put on the object over the area
24
Created by Boundless
The center of mass's main characteristic is that it
A
appears to carry the whole mass of the body
B
does not actually have anything in it
C
actually carries all the mass
D
does not carry any mass of the body
25
Created by Boundless
You break down an object into small sections, add the products of the individual
masses and positions, and divide by the total mass when you want to determine
the center of mass of
A
any three-dimensional body
B
any object
C
a hollow sphere
D
26
an oddly shaped object
Created by Boundless
Torque (α ) are related by the following formula:
A
, where I is the objects moment of inertia
B
, where I is the objects moment of inertia
C
, where I is the objects moment of inertia
D
, where I is the objects moment of inertia