Kinetic Concepts for Analyzing Human Motion

Question 1

Mass

Answer 1

Quantity of matter composing a body

kg/slug

Question 2

Inertia

Answer 2

Tendency to resist change in state of motion of resistance to change in acceleration

Proportional to mass

Question 3

Force

Answer 3

push/pull
(magnitude/direction.point of application)

F=m*a

Question 4

Types of Force

Answer 4

Internal Force
External Force
Noncontact Force(ext)
Contact Force (ext)
Normal Contact (ext, con)
Friction (ext, con)

Question 5

Internal Force

Answer 5

incapable of producing changes in motion of body’s COM. (tensile force, compressive force)

Question 6

External Force

Answer 6

Interaction with the environment

Question 7

Noncontact Forces

Answer 7

Subdivision of External Force

Ex. Gravity
Electromagnetic
Nuclear

Question 8

Contact Forces

Answer 8

2 components

Normal contact (reaction) force

Friction
(human locomotion

Question 9

Net Force

Answer 9

Single resultant force derived from the vector composition of all the acting forces.

determines the net effect of all acting forces on a body

Question 10

Free body diagram

Answer 10

diagram showing vector representations of all forces acting on a defined system.

Question 11

Torque

Answer 11

rotary effect of a force
angular equivalent of force
(moment of force)

Question 12

Force

Answer 12

Fd(upside down T) product of force and the perpendicular distance from the forces line of action to the axis of rotation.

Question 13

Center of Gravity

Answer 13

point which body weight equal to all directions