Forces & Newton

Question 1

WE APPLY FORCE TO?

Answer 1

to move and accelerate our body
objects to move and accelerate them
objects to move and accelerate other objects

Question 2

FORCE IS PUSH PULL

Question 3

NEWTON’S LAW OF GRAVITY
1643 - 1727

Answer 3

Newton’s law of universal gravitation states:
All bodies are attracted to one another with a force which is proportional to the product of their masses, and inversely proportional to the square of the distance between them.
Used to predict the motion of planets and stars.
Objects in sports are very small compared to planets!
The only object we must consider is the earth (gravity)

Question 4

CENTRE OF MASS/GRAVITY

Answer 4

The point around which the mass of a body is balanced.
Any object behaves as if the whole of its mass or weight is concentrated at its centre of mass/gravity.
When standing the Centre of Mass is just in front of the lumbosacral junction.
The Centre of Mass will move with any movement of the body.

Question 5

STABILITY

Answer 5

When the line of gravity intersects with the base of support an object is said to be stable
When the line lies outside that base of support it is said to be unstable

Question 6

NEWTON’S LAWS OF MOTION
IN AC, A-R

Answer 6

Inertia
Acceleration
Action - Reaction

Question 7

INERTIA

Answer 7

A body will remain at a constant state unless force is applied to it.

Question 8

ACCELERATION

Answer 8

The acceleration of a body is proportional to the sum of the forces acting on it.

Question 9

ACTION - REACTION

Answer 9

For every action, there is always an equal and opposite reaction

Question 10

FORMULAS TO REMEMBER
MOMENTUM

Answer 10

L=MV
momentum = mass x velocity