Kinetics

Question 1

What is kinetics?

Answer 1

describe the forces associated with that movement

Question 2

What is a force?

Answer 2

alters an objects state of rest or uniform motion
units- N (newtons
§Forces move and stop bodies
§Forces deform bodies (change in
shape or size).
§Forces accelerate bodies:
§Increase speed.
§Decrease speed.
§Change direction.

Question 3

What is gravity?

Answer 3

§ Attraction between any two objects
§ Dependent on density and mass
§ Gravity (g) is the force of attraction
between an object and Earth.
§ Earths gravity = 9.81 ms-2 (10)

Weight is the force experienced due
to the gravitational acceleration.

Question 4

What is mass?

Answer 4

quantity of matter making up a body

contestant anywhere in the universe

Question 5

What is weight?

Answer 5

amount of force due to gravitational acceleration exerted on the body
changes depending on location in the universe
vector

Question 6

What are the three newton laws?

Answer 6

LAW OF INERTIA
an object will keep doing what its doing unless another force acts on it

LAW OF ACCELERATION
if a force is applied to an object the object will accelerate in the direction of the applied force- heavier objects will require more force to

LAW OF ACTION-REACTION
for every action there is an equal; and opposite reaction eg; when a force is applied by object 1 on object 2, object 2 exerts an equal and opposite force on object 1

Question 7

What is inertia?

Answer 7

the tendency of an object to resist changes in its velocity whether its motionless or in motion

Question 8

What is a ground reaction force (GRF)?

Answer 8

a force exerted by the ground on a body in contact with it (law of action-reaction)
GRF acts in 3 dimensions

Question 9

Why are GRF’s important?

Answer 9

forces experienced by legs when running

therefore these are potentially damaging forces on the musculoskeletal tissues

Question 10

What do force plates do?

Answer 10

measures instantaneous GRF in three orthogonal planes