Lecture 3- Motion I/II

Question 1

Magnitude only

Answer 1

Scalar quantities

Question 2

Magnitude & Direction (force, velocity: e.g. 1.5 m/s to right)

Answer 2

Vector quantities

Question 3

g =

Answer 3

9.81 m/s2,

Question 4

m • g,

Answer 4

W

Question 5

Does MA (Moment Arm) of a muscle 
changes with
Joint Angle?

Answer 5

Yes

Question 6

= F * MA

Answer 6

Torque

Question 7

A sketch of the outlined shape of the body or body segment, which represents it, as being isolated from its surroundings with all forces and torques that the surroundings exert on the body

Answer 7

Free Body Diagram

Question 8

condition in which an object is at rest if originally at rest, or has a constant velocity (linear and angular) if originally in motion.

Answer 8

Equilibrium of the Force System (Statics)

Question 9

Lever Class

E –>F–>Load

Answer 9

First

Question 10

Lever Class

E –>Load–>Fulcrum

Answer 10

Second

– your gastrocnemius

Question 11

Lever Class

Fulcrum –> Effort –> Load

Answer 11

Third

Biceps

Question 12

The ability of the tibialis posterior to lift the arch depends

Answer 12

Retinaculum ??

Question 13

Property of the mass.

Answer 13

Inertia

Question 14

Property of the mass and its distribution with respect to the axis of rotation

Answer 14

Moment of Inertia

Question 15

force x distance x cos θ

Answer 15

Work

Question 16

Capacity to perform work

Answer 16

Energy

Question 17

Energy due to an objects motion (½ mv2)

Answer 17

Kinetic

Question 18

Energy due to an objects position (m g h)

Answer 18

Potential / Gravitational

Question 19

Energy stored by compression or stretching

Answer 19

Elastic

Question 20

The RATE that work is done

Answer 20

Power

Question 21

Work / time interval –or– Force x Velocity

Answer 21

Power

Question 22

Property of a moving body

Answer 22

Momentum

Question 23

Mass x Velocity

Answer 23

Both Mass and Velocity affect the time or the distance it takes to stop a moving object

Momentum

Question 24

Change of Momentum

Force x Time interval

Answer 24

Impulse

Question 25

Reduction of Momentum

Answer 25

Shock Absorption

Question 26

) accounts for net forces generated by “bone-on-bone” contact

Answer 26

Joint reaction force (JRF)

Question 27

What contributes to JRF?

Answer 27

muscle force (due to muscle activity)
gravity related forces (mass of whole body or body segments)
forces due to motion (inertia)
ligamentous