Semester Exam: Chapters 1-13

Question 1

The energy an object acquires when it is exposed to a force is called ….. energy.

Answer 1

Kinetic

Pg. 172

Question 2

The resistance of molecules to flow because of their attraction to other molecules and to the walls of their container is called …..

Answer 2

Viscosity

Question 3

Motion about an internal axis is called ….. motion.

Answer 3

Rotary

Pg. 186

Question 4

What is defined as the time rate doing work?

Answer 4

Power

Pg. 162

Question 5

The type of collision in which kinetic energy is conserved is called …..

Answer 5

Elastic

Question 6

The product of an object’s mass and velocity is called …..

Answer 6

Momentum

Pg. 196

Question 7

The time rate of change in angular displacement is called …..

Answer 7

Angular velocity

Pg. 188

Question 8

Which of the following statements is true concerning friction?

Answer 8

Friction works as an opposite force to a forward motion force

Question 9

A heavy spinning disk used in many machines in order to conserve angular momentum is a(n) …..

Answer 9

Flywheel

Pg. 198

Question 10

Of the four fundamental forces, which is the strongest?

Answer 10

Strong Force

Pg. 119

Question 11

The man who wrote Principia was …..?

Answer 11

Newton

Question 12

In one circle there are ….. radians.

Answer 12

2

Question 13

Avogadro’s number is equal to …..

Answer 13

6.022 X 10^23 molecules

Question 14

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 …..

Answer 14

T(torque)= F(r)

Question 15

The point beyond which a stretched substance will not return to its original length is called its ……

Answer 15

Elastic limit

Pg. 69, 73

Question 16

Completion
When the work done in moving an object depends only on the initial and final locations, the object is restrained by ….. forces.

Answer 16

Conservative

Pg. 176

Question 17

The product Fr is called …..

Answer 17

Torque

Pg. 195

Question 18

The term …. is often defined as the “the capacity to do work.”

Answer 18

Energy

Pg. 172

Question 19

Any solid object rotating about a fixed axis is called a(n) ……

Answer 19

Gyroscope

Pg. 199

Question 20

The linear distance from one point to another on a circular path is called the …..

Answer 20

Arc length (s)
Pg. 187

Question 21

The …. of an object is defined as the ratio of its mass to its volume.

Answer 21

Density

Pg. 20

Question 22

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) …..

Answer 22

Radian

Pg. 187

Question 23

The type of collision in which kinetic energy is not conserved is called a(n) ….. collision.

Answer 23

Inelastic

Pg. 182

Question 24

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.

Answer 24

conservation

Pg. 177

Question 25

The amount of rotation accomplished by a rotating body is measured by its .....

Answer 25

angular displacement Pg. 188

Question 26

The average angular velocity of a rotor that turns 314 rad in 7.53 s is ..... rad/s. (Keep significant figures)

Answer 26

41.7 rad/s

Question 27

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)

Answer 27

0.13 seconds | 2/15

Question 28

``` True/False To change (degrees to radians) multiply by the factor 180 degrees/pie. ```

Answer 28

False | pie/180 degrees

Question 29

The change in the momentum of an object affected by a force is equal to the object's (impulse).

Answer 29

True | Pg 183

Question 30

The IMA of any simple machine will be (less) in value than its AMA.

Answer 30

more | Pg. 167

Question 31

When the net force acting on a system is zero, the (momentum) of the whole system remains constant.

Answer 31

True | Stated above - law of conservation of momentum

Question 32

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.

Answer 32

rotational | Pg. 201

Question 33

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.

Answer 33

True

Question 34

An angular velocity of 4500 rev/min is equal to about (430) rad/s.

Answer 34

471. rad/s

Question 35

As body's resistance to a change in its rotary motion is called (friction).

Answer 35

rotational inertia

Question 36

Short answer Define the two conditions a body must meet in order to be in static equilibrium.

Answer 36

1. The first condition of static equilibrium is that the net forces acting on the body (horizontally and vertically) must be zero. 2. 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

Question 37

What is the defining feature of a completely inelastic collision which distinguishes it from any other type of collision.

Answer 37

In a completely inelastic collision, the two objects stick together afterward. Pg. 182

Question 38

``` Know symbols for the following: Rotational inertia Angular acceleration Universal gas constant Temperature Time Density Displacement Coefficient of friction Torque Angular velocity ```

Answer 38

``` 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) ```

Question 39

Write correct Equations | The work-energy theorem

Answer 39

W= 0.5(m)(v final)^2 - 0.5(m)(v initial)^2 Pg. 173

Question 40

Determines the translational kinetic energy of an object

Answer 40

KE= 0.5(m)(v)^2 Pg. 196

Question 41

Determines the angular acceleration of an object

Answer 41

a = delta w ———— t Pg. 189

Question 42

The law of torque

Answer 42

T= I (a) Small Greek t Capital i Greek alpha Pg. 196

Question 43

Determines the total kinetic energy of a moving body

Answer 43

KE= 0.5(m)(v)^2 + 0.5(I)(w)^2 Pg. 197

Question 44

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?

Answer 44

a= (w final) - (w initial) ————————— t Pg. 189

Question 45

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?

Answer 45

PE=mgh Pg. 175

Question 46

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?

Answer 46

T= Fr

Question 47

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?

Answer 47

m1v1+m2v2=(m1v1)+(m2v2)

Question 48

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?

Answer 48

F delta length —— = Y ————— A Original length

Question 49

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?

Answer 49

p=mv kg•m/s