Quiz #3

Question 1

Is TORQUE linear or angular?

Answer 1

Angular

Question 2

Is MOMENT INERTIA linear or angular?

Answer 2

Angular

Question 3

Is ANGULAR MOMENTUM linear or angular?

Answer 3

Angular

Question 4

Is ANGULAR DISPLACEMENT linear or angular?

Answer 4

Angular

Question 5

Is ANGULAR VELOCITY linear or angular?

Answer 5

Angular

Question 6

Is TANGENTIAL VELOCITY linear or angular?

Answer 6

Linear

Question 7

Is ANGULAR ACCELERATION linear or angular?

Answer 7

Angular

Question 8

Is TANGENTIAL ACCELERATION linear or angular?

Answer 8

Linear

Question 9

Is CENTRIPETAL ACCELERATION linear or angular?

Answer 9

Linear

Question 10

Is TORQUE kinetic or kinematic?

Answer 10

Kinetic

Question 11

Is MOMENT OF INERTIA kinetic or kinematic?

Answer 11

Kinetic

Question 12

Is ANGULAR MOMENTUM kinetic or kinematic?

Answer 12

Kinetic

Question 13

Is ANGULAR DISPLACEMENT kinetic or kinematic?

Answer 13

Kinematic

Question 14

Is ANGULAR VELOCITY kinetic or kinematic?

Answer 14

Kinematic

Question 15

Is TANGENTIAL VELOCITY kinetic or kinematic?

Answer 15

Kinematic

Question 16

Is ANGULAR ACCELERATION kinetic or kinematic?

Answer 16

Kinematic

Question 17

Is TANGENTIAL ACCELERATION kinetic or kinematic?

Answer 17

Kinematic

Question 18

Is CENTRIPETAL ACCELERATION kinetic or kinematic?

Answer 18

Kinematic

Question 19

Equation for TORQUE:

Answer 19

T= F(r)

*r in this case is moment arm

Question 20

Equation for MOMENT OF INERTIA:

Answer 20

I = mr^2

Question 21

Equation for ANGULAR MOMENTUM:

Answer 21

H = I (ω)

Question 22

Equation for ANGULAR DISPLACEMENT:

Answer 22

Δθ = Δ angular position

Δθ = θf - θi

Question 23

Equation for ANGULAR VELOCITY:

Answer 23

ω = Δθ/ Δtime

Question 24

Equation for TANGENTIAL VELOCITY:

Answer 24

Vt= ω(r)

Question 25

Equation for ANGULAR ACCELERATION:

Answer 25

α = Δω/ Δtime

Question 26

Equation for TANGENTIAL ACCELERATION:

Answer 26

αt = α(r)

Question 27

Equation for CENTRIPETAL ACCELERATION:

Answer 27

``` αr = Vt^2/r αr = ω^2r ```

Question 28

Units for TORQUE:

Answer 28

Nm

Question 29

Units for MOMENT OF INERTIA:

Answer 29

kg*m2

Question 30

Units for ANGULAR MOMENTUM:

Answer 30

kg*m2 /s

Question 31

Units for ANGULAR DISPLACEMENT:

Answer 31

rads

Question 32

Units for ANGULAR VELOCITY:

Answer 32

rad/s

Question 33

Units for TANGENTIAL VELOCITY:

Answer 33

m/s

Question 34

Units for ANGULAR ACCELERATION:

Answer 34

rad/s2

Question 35

Units for TANGENTIAL ACCELERATION:

Answer 35

m/s2

Question 36

Units for CENTRIPETAL ACCELERATION:

Answer 36

m/s2

Question 37

Is ANGULAR IMPULSE linear of angular?

Answer 37

Angular

Question 38

Equation for ANGULAR IMPULSE:

Answer 38

ΣTΔt

Question 39

Units for ANGULAR IMPULSE:

Answer 39

Nm*s

Question 40

Difference between an absolute and relative angular position:

Answer 40

Absolute- other line or plane is fixed and immovable relative to the earth Relative- other line or plane is capable of moving

Question 41

Relationship between tangential velocity and average angular velocity, and how the relationship applies to sports:

Answer 41

VT = W(r) Tangential velocity is equal to angular velocity times the radius. Swinging a baseball bat. The further that the bat hits the ball from the axis of rotation, the faster it will be hit. Increase in radius, but keep the angular velocity the same, there will be an increase in linear velocity.

Question 42

Define moment arm:

Answer 42

Perpendicular distance between the line of action of the force and a line parallel to it that passes though the axis of rotation

Question 43

How does moment arm affect torque?

Answer 43

Moment arm can change throughout movement, but radius does not change. If force is held constant and moment arm increases, torque increases If force is held constant and moment arm decreases, torque decreases

Question 44

What is the center of gravity, and what affects it?

Answer 44

Point in a body or system around which its weight is evenly distributed or balanced and through which the force of gravity acts Gender; top heavy/bottom heavy →skip leg day

Question 45

What affects stability?

Answer 45

Increase base of support/contact Widen stance Lower to ground

Question 46

Relationship between angular impulse and angular momentum.

Answer 46

Conservation of Angular Momentum: Hi = Hf IiWi = IfWf | Angular Impulse: T(t) = ΔH

Question 47

Why is it easier to hit a golf ball further with a driver (the longest club) than a pitching wedge (the shortest club)?

Answer 47

The radius is longer in the driver. | VT = ω(r)

Question 48

What advantages do longer limbed individuals have in throwing or striking activities?

Answer 48

Increase in radius will increase the tangential velocity, causing it to go further (if angular velocity is kept constant)

Question 49

Why is it recommended that you flex your knees and hips (squat down) when lifting a heavy load off the floor, rather than just flexing your hips and back (leaning over)?

Answer 49

Flex just at hips/back, the moment arm just on hips is shorter and back is greater, which increases torque on the back/hips. Flex just at hips/knee, the moment arm just on hips and knee is greater, which increases the torque on the back/hips. Some of the torque is distributed between the hips and knees.

Question 50

Which exercise is easier to do (if you use the same weight for both), a straight-arm pullover, or a bent-arm pullover?

Answer 50

Bent-arm because moment arm about the shoulder is smaller, decreasing the amount of torque Arms completely straight is much harder because moment arm is longer, increasing torque

Question 51

Describe the best position to be in when you compete in a tug-of-war competition.

Answer 51

Increased stability: low to ground, staggered stance, and leaning back

Question 52

When thinking of skills that require spinning, why is it beneficial for a gymnast to be smaller?

Answer 52

I=mr2 Rotating about a smaller radius, smaller mass, which means you have a smaller moment of inertia. Smaller moment of inertia means you are less resistant to changes in angular motion → spin easier

Question 53

Centric motion and type of movements:

Answer 53

Pushing through center of gravity → causes linear movement

Question 54

Eccentric motion and type of movements:

Answer 54

Not through center of gravity → linear and angular movement

Question 55

Force couples and type of movements:

Answer 55

Opposing motions → causes angular movements