DEFINING FORCE

Question 1

Forms of motion (3)

Answer 1

1) Linear: movement in a line same direction same speed
2) angular: rotation around central point
3) general: mix of linear and angular

Question 2

Define Force

Answer 2

Push or a pull to produce, change or prevent movement

Question 3

Compression, tensile and bending

Answer 3

Compression- squishing in
Tensile- pulling apart
Bending- combination of both

Question 4

Internal force VS external force

Answer 4

Internal- study if excercise when we study nature of injury

External- forces that act on an object as a result of an interaction

Question 5

Contact VS non contact forces

Answer 5

Contact -air resistance, water

Non contact- non touching forces such as gravity magnetic forces and electrical

Question 6

Define friction

Answer 6

Result of interaction between molecules of surfaces in contact

Question 7

Static friction VS Kinetic friction

Answer 7

Static- 2 object in contact motionless

Kinetic-2 objects moving on top of another

Question 8

Dynamography

Answer 8

Measurement of forces and pressure

Stain gauge- wire attached to 2 pads

Load cell- transducer converts force into electrical. You step on it

Question 9

Describe the equation F=ma

Answer 9

Force =mass * acceleration

newton’s 2nd Law

The greater the force the greater the acceleration

The more mass of an object the more acceleration needed to move it

Question 10

What is acceleration

Answer 10

• rate of CHANGE of velocity (change in speed, direction, or both)
• object acceleration =net force of all forces acting on an object (NEWTONS 2nd Law )
• any motion CHANGE is acceleration

Question 11

Quantitative analysis

Answer 11

Breaks it down into individual component

Theory formed by Russian ergonomists

Question 12

Define kinesiology

Answer 12

Study of human movement

Question 13

Define biomechanics

Answer 13

Study of the forces that produce human movement

Trying to improve performance and technique

Question 14

Define kinematics

Answer 14

Study of describing motion 
Displacement 
Velocity
Acceleration 
Position of object 

Don’t look at forces

Question 15

Describe kinetics

Answer 15

Study of FORCES causing motion

Torque
Gravity
Friction

Question 16

Static state Vs Dynamic state

Answer 16

Static state-velocity is constant, unchanging

Dynamic state-velocity is changing

Question 17

Rectilinear VS curvilinear

Answer 17

Movement along a straight path

Movement along a curved path

Question 18

Define momentum

Answer 18

Mass* velocity (p=mv)

The consequence of a motion

MASS IN MOTION

Greater mass=greater momentum

Question 19

How to calculate weight

Answer 19

Weight( Newton force)= mass * acceleration of gravity

Question 20

Linear kinematics

Answer 20

Describing motion in space and time without using force when all point on a body move same distance and direction

Question 21

What is translation

Answer 21

Linear motion =translation

Linear motion is when all points on a body move same distance , direction and time

Question 22

Calculate acceleration

Answer 22

a= change in velocity (V2-V1)

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Question 23

Describe speed, velocity and acceleration

Answer 23

Speed = change in distance /time

Velocity =change in displacement /time
(takes into account size and direction)

Acceleration= change in velocity/time

Question 24

Who uses kinematics (describing movement using position speed etc…)

Answer 24

1. Coaches solidify technique
2. Therapists return to healthy joint function
3. Paediatrician assess what is healthy motor patterns

Question 25

Terms to describe linear motion (hint it’s vectors)

Answer 25

Velocity = displacement /time Acceleration = velocity /time (CHANGE in velocity Displacement = getting from one point to another without taking into account actual distance covered