Kinetics

Question 1

Why are kinetics usefu;?

Answer 1

Explains the underlying cause of the movement pattern of technique
Provides explanation of the musculoskeletal demand movement

Question 2

What is static?

Answer 2

Body/object is stable

Question 3

What is dynamic?

Answer 3

Body/object is in motion

Question 4

What is a force?

Answer 4

Pushing or pulling action the body has

Question 5

What is force measured in?

Answer 5

Newtons (N)

Question 6

What is net force?

Answer 6

The resultant of all forces affecting

Question 7

When is the body in equilibrium?

Answer 7

During static condition

Question 8

When does equilibrium exist?

Answer 8

The net force on the body is 0

The resultant force acting on the body is 0

Question 9

What is an internal force?

Answer 9

Force from inside

Ie. Muscle force

Question 10

What is an external force?

Answer 10

Force from outside the body

ie. Ground reacting on the body forces

Question 11

What are the 3 characteristics of a force?

Answer 11

1. Direction
2. Magnitude
3. Point of application

Question 12

What is mass?

Answer 12

Amount of matter in the body

Measure of the inertia of the body

Question 13

What is inertia?

Answer 13

The resistance of a body to change in motion

Question 14

If the inertia of the body is large is it more or less force to create the same motion?

Answer 14

More

Question 15

What is weight?

Answer 15

the gravitational force attracting a body towards the earth

Question 16

How is weight worked out?

Answer 16

W=MXG

Mass x Gravity

Question 17

What is the value of gravity?

Answer 17

9.81

Question 18

What is newtons 1st law of inertia?

Answer 18

Body will remain stable unless reacted upon by external or internal force.

Gymnast will stay in handstand unless reacted on by a force.

Question 19

What is newtons 2nd law of acceleration?

Answer 19

The rate of change in momentum will happen if a force acts upon it, in the direction the force is applied.

If a ball is kicked it will accelerate away from the foot

Question 20

What equation is associated with newtons law of acceleration?

Answer 20

F=MXA

Force = mass x acceleration

Question 21

What is newtons 3rd law of action reaction?

Answer 21

Forces always occur in pairs.
For each force applied their is a second body applying force back.

Ie. floor provides force against the body

Question 22

What is momentum?

Answer 22

The quantity of motion

Linear or angular form

Question 23

How is linear momentum worked out?

Answer 23

Mass x Linear velocity

Question 24

What is impulse?

Answer 24

The product of force and the time over which the force is applied

Question 25

How is impulse worked out?

Answer 25

I=FxT

Impulse = Force x Time

Question 26

What is friction?

Answer 26

The force that is created when one body moves against another

Question 27

What are the 2 types of friction?

Answer 27

Sliding

Rolling

Question 28

What is pressure?

Answer 28

The effect of a force applied over a given area

Question 29

How is pressure worked out?

Answer 29

Pressure= Force/Area

Question 30

What is pressure measured in?

Answer 30

Pascals (Pa)

Question 31

What is the relationship between impulse and momentum?

Answer 31

Impulse causes a change in the momentum of an object
Impulse=mv-mu 
M= mass
V=final velocity 
U= Initial velocity