Question 1

What has historically been referred to as centrifugal force, is really just inertia.

Accepted Answer

A) True 
 B)False

Question 2

How many principle axes are there for the human body?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four

Question 3

Which of Newton's laws (angular analogues) explains why a batter wears cleats?

Accepted Answer

A)  1st law-moment of inertia 
B)  2nd law-angular acceleration 
C)  3rd law-reaction 
D)  none of the above

Question 4

The statement "a rotating body will maintain a state of constant angular motion unless acted on by an external torque" refers to which of the following?

Accepted Answer

A)  Newton's first law of inertia 
B)  Newton's second law of acceleration 
C)  Newton's third law of action/reaction 
D)  none of the above

Question 5

Which of the following is true of a baserunner weighing 70 Newtons and a baserunner weighing 50 Newtons?

Accepted Answer

A)  the centripetal force exerted on the heavier baserunner will be greater 
B)  the heavier baserunner will not be able to run as fast around the bases, due to a greater centripetal force 
C)  if the baserunners run at the same velocity around the bases, the heavier baserunner will have to lean in more towards the pitcher's mound due to a greater centripetal force 
D)  all of the above are true

Question 6

If a diver goes from a full layout position to a tuck position, what will happen to his momentum?

Accepted Answer

A)  increase 
B)  decrease 
C)  remain the same 
D)  need more information

Question 7

When knee flexion is increased, what happens to the moment of inertia of the leg about the hip?

Accepted Answer

A)  increased 
B)  decreased 
C)  remains the same 
D)  need more information

Question 8

When a body is rotating, the force directed toward the center of rotation is called ___________________ force.

Accepted Answer

The answer of When a body is rotating, the force...

Question 9

Moment of inertia is the angular analogue of what?

Accepted Answer

A)  moment of force 
B)  moment of time 
C)  mass 
D)  surface area

Question 10

Which of the following quantities increases as moment of inertia decreases during the airborne phase of a dive?

Accepted Answer

A)  angular momentum 
B)  angular velocity 
C)  both A and B 
D)  neither A nor B

Question 11

Discuss the advantages and disadvantages of a small body size (including muscle mass) for a gymnast performing full body rotations.

Accepted Answer

The answer of Discuss the advantages and disadvantages of a...

Question 12

Why is a bat easier to swing if you grip the barrel instead of the handle?

Accepted Answer

A)  k is reduced 
B)  k is increased 
C)  moment of inertia is increased 
D)  easier to grip the barrel

Question 13

Why are golf club heads weighted?

Accepted Answer

A)  to increase the moment of inertia of the club with respect to the shoulder 
B)  to increase the moment of inertia of the club head rotating around the shaft 
C)  to decrease the moment of inertia of the club with respect to the shoulder 
D)  to decrease the moment of inertia of the club head rotating around the shaft

Question 14

What effect does "choking up" on a bat have?

Accepted Answer

A)  reduces moment of inertia 
B)  increases angular velocity of swing 
C)  reduces mass 
D)  both A and B 
E)  all of the above

Question 15

Regarding moment of inertia of the leg with respect to the hip, which of the following leg morphologies would favor a sprinter?

Accepted Answer

A)  massive thighs and slimmer lower legs 
B)  massive lower legs and slimmer thighs 
C)  leg morphology does not matter 
D)  need more information

Exam 14: Angular Kinetics of Human Movement