Deck 4: Muscle and Joint Kinematics and Kinetics

Question 1

In dynamics, the sum of the forces is expressed as:

A) ΣF x d
B) ΣF=I c of g
C) ΣF=ma
D) ΣF=0
E) ΣF=M

Answer 1

C
Explanation: The sum of the forces is expressed as ΣF=ma

Question 2

Clockwise moments are expressed as:

A) Positive
B) Negative
C) Negative and positive
D) None of these
E) All of these

Answer 2

B
Explanation: Clockwise moments are given the negative term

Question 3

Counter-clockwise moments are expressed as:

A) Negative
B) All of these
C) Negative and positive
D) Positive
E) None of these

Answer 3

D
Explanation: Counter-clockwise (or anti-clockwise) moments are given the positive term

Question 4

In dynamics, the sum of the moments is expressed as:

A) ΣM = I
B) ΣM= 0
C) ΣM=F × d
D) ΣM=ma
E) ΣM=Iα

Question 5

The moment of inertia of the human body can be calculated by:

A) I c of g
B) I = mk²
C) I = m+d²
D) I = m/d²

Question 6

In dynamics equations, we often use:

A) Linear accelerations of segments and masses
B) The forces from the passive structures such as ligaments and tendons
C) Moments that are created at joints by segments
D) The specific joint friction characteristics

Question 7

Dynamics can be useful for:

A) Injury prevention
B) Improvement in performance
C) determining static muscle and joint forces
D) solving equilibrium problems

Question 8

Moment of inertia is different to inertia

Question 9

Dynamics does not require acceleration values to be known or calculated

Question 10

To solve dynamics problems you need to use accelerations

Question 11

Why are dynamics calculations important?

Question 12

What approach do we use to solve dynamic problems?

Question 13

What principle is used in dynamic calculations?

Question 14

What can dynamic calculations be used for?

Question 15

What is the moment of inertia of an object or segment?

Question 16

Which of the following are provided from static calculations of joints and muscles

A) Velocity
B) Acceleration
C) Force
D) Moments
E) None of these

Question 17

Statics and dynamics are an important part of biomechanics

Question 18

Static calculations provide joint and muscle forces

Question 19

Static calculations need to know the mass of objects

Question 20

What are some of the assumptions/considerations needed in 2D static calculations?

Question 21

How can statics calculations be used for modelling programs?

Question 22

The sum of the forces is equal to zero, is better known as what?