Semester Exam: Chapters 1-13 Flashcards
The energy an object acquires when it is exposed to a force is called ….. energy.
Kinetic
Pg. 172
The resistance of molecules to flow because of their attraction to other molecules and to the walls of their container is called …..
Viscosity
Motion about an internal axis is called ….. motion.
Rotary
Pg. 186
What is defined as the time rate doing work?
Power
Pg. 162
The type of collision in which kinetic energy is conserved is called …..
Elastic
The product of an object’s mass and velocity is called …..
Momentum
Pg. 196
The time rate of change in angular displacement is called …..
Angular velocity
Pg. 188
Which of the following statements is true concerning friction?
Friction works as an opposite force to a forward motion force
A heavy spinning disk used in many machines in order to conserve angular momentum is a(n) …..
Flywheel
Pg. 198
Of the four fundamental forces, which is the strongest?
Strong Force
Pg. 119
The man who wrote Principia was …..?
Newton
In one circle there are ….. radians.
2
Avogadro’s number is equal to …..
6.022 X 10^23 molecules
The torque produced by a 115 N force applied perpendicularly to the end of a 2.00 m board pivoted at the other end is …..
T(torque)= F(r)
The point beyond which a stretched substance will not return to its original length is called its ……
Elastic limit
Pg. 69, 73
Completion
When the work done in moving an object depends only on the initial and final locations, the object is restrained by ….. forces.
Conservative
Pg. 176
The product Fr is called …..
Torque
Pg. 195
The term …. is often defined as the “the capacity to do work.”
Energy
Pg. 172
Any solid object rotating about a fixed axis is called a(n) ……
Gyroscope
Pg. 199
The linear distance from one point to another on a circular path is called the …..
Arc length (s) Pg. 187
The …. of an object is defined as the ratio of its mass to its volume.
Density
Pg. 20
An angle who vertex is placed at the center of a circle and subtends an arc length equal to one radius is the definition for a(n) …..
Radian
Pg. 187
The type of collision in which kinetic energy is not conserved is called a(n) ….. collision.
Inelastic
Pg. 182
The statement “If a system is isolated from nonconservative forces, then the total mechanical energy must remain constant” is called the law of ….. of mechanical energy.
conservation
Pg. 177
The amount of rotation accomplished by a rotating body is measured by its …..
angular displacement
Pg. 188
The average angular velocity of a rotor that turns 314 rad in 7.53 s is ….. rad/s. (Keep significant figures)
41.7 rad/s
The time it would take for a ball that is rolling at 15 rad/s to rotate one time is …..s. (Round to two decimals)
0.13 seconds
2/15
True/False To change (degrees to radians) multiply by the factor 180 degrees/pie.
False
pie/180 degrees
The change in the momentum of an object affected by a force is equal to the object’s (impulse).
True
Pg 183
The IMA of any simple machine will be (less) in value than its AMA.
more
Pg. 167
When the net force acting on a system is zero, the (momentum) of the whole system remains constant.
True
Stated above - law of conservation of momentum
When, at every possible pivot point, the sum of clockwise torques equals the sum of counterclockwise torques, the system is said to be in (translational) equilibrium.
rotational
Pg. 201
If a disk and a ring of the same mass and radius are released simultaneously at the top of an inclined plane, the (disk) will roll to the bottom first.
True
An angular velocity of 4500 rev/min is equal to about (430) rad/s.
- rad/s
As body’s resistance to a change in its rotary motion is called (friction).
rotational inertia
Short answer
Define the two conditions a body must meet in order to be in static equilibrium.
- The first condition of static equilibrium is that the net forces acting on the body (horizontally and vertically) must be zero.
- The second condition of static equilibrium assures: in any given plane, the sum of clockwise torques must equal the sum of counterclockwise torques about every possible pivot point.
Pg. 201
What is the defining feature of a completely inelastic collision which distinguishes it from any other type of collision.
In a completely inelastic collision, the two objects stick together afterward.
Pg. 182
Know symbols for the following: Rotational inertia Angular acceleration Universal gas constant Temperature Time Density Displacement Coefficient of friction Torque Angular velocity
Rotational inertia (I) capital i Angular acceleration (a) Greek alpha Universal gas constant (R) Temperature (K) kelvins Time (s) seconds Density (p) Greek Displacement (d) Coefficient of friction (u) Greek letter w/ two lines of bottom edges Torque (t) Greek small swiggley capital T Angular velocity (w)
Write correct Equations
The work-energy theorem
W= 0.5(m)(v final)^2 - 0.5(m)(v initial)^2
Pg. 173
Determines the translational kinetic energy of an object
KE= 0.5(m)(v)^2
Pg. 196
Determines the angular acceleration of an object
a = delta w
————
t
Pg. 189
The law of torque
T= I (a)
Small Greek t
Capital i
Greek alpha
Pg. 196
Determines the total kinetic energy of a moving body
KE= 0.5(m)(v)^2 + 0.5(I)(w)^2
Pg. 197
Problems
When you turn on your CD player, the turntable accelerates from zero to 41.8 rad/s in 3.0 s. What is the angular acceleration?
a= (w final) - (w initial)
—————————
t
Pg. 189
What is the gravitational potential energy of a flower pot weighing 0.41 kg and sitting on a second-floor window sill 12 m above the ground?
PE=mgh
Pg. 175
How much torque do you exert on a lug (a nut used to fasten the wheel of a car to the axle) if you apply 50.0 lb of force perpendicular to the end of a 3.0 ft lug wrench?
T= Fr
If a 7.3 kg bowling ball collides head-on with a 1.6 kg pin, and if the velocity of a ball before a collision is 3.0 m/s and after collision is 1.9 m/s, what is the velocity of the pin after collision?
m1v1+m2v2=(m1v1)+(m2v2)
What is the value of Young’s modulus for a wire 0.20 m long and 7.85 x 10 (to the negative 9) m^2 in cross sectional area if it stretches 1.0 x 10 (to the negative 2) m when a force of 15.0 N is applied?
F delta length
—— = Y —————
A Original length
A rifle forces a 1.8 X 10(to the negative 3) kg bullet into a block of balsa wood. What is the average force exerted on the bullet by the balsa wood if it’s decelerated at an average rate of 3.4 X 10(to the 5th) m/s?
p=mv
kg•m/s
