Force
Forces can produce movement or change the motion of an object
Force = mass x acceleration
= m x a
Inertia
An object will remain in a state of rest or constant motion unless acted upon by an external force. Inertia is a tendency for a body to resist change in its state of motion whether that be at rest or moving with a constant velocity
Newtons Laws of Motion
FIRST LAW
- A body will remain at rest or in a state of constant motion unless acted upon an external force.
A ball will continue in the air unless acted upon by an external force. The ball won’t move until it has been kicked (force applied).
SECOND LAW
- A force applied to an object will produce a change in motion (acceleration) in the direction of the applied force that is directly proportional to the size of the force.
Shot-put and discus. Shotput, an object with a much greater mass than the discus, must be thrown with much more force than the discus to the same acceleration.
THIRD LAW
- For every action there is an opposite and equal reaction.
If you press a stone with your finger, the finger is also pressed by the stone.
Friction
Is just one of many forces
(incluiding gravity, weight, air & water resistance)
That can be applied to objects
Friction happens when two objects come into contact with each other and it opposes motion of the object(s)
Increased friction can be good
Friction between the bowling ball and bowling lane is good. The more oil on the lane means the ball is slow down less and the harder it is for the bowler to send the ball in a curved path.
Decreased friction can be good just like in Downhill Skiing
Angular Momentum
Angular momentum is conserved when a body is in flight and there is an inverse relationship between angular velocity and moment of inertia
Summation of momentum
Summation of momentum – also known as summation of force or the kinetic link principle
Maximum velocity is created when momentum is generated in a sequential or summed manned from larger body parts close to the center of gravity to those further away
e.g. – when throwing or kicking a ball, momentum is generated at the waist (hips and trunk) and then transferred to the limbs ( arms and legs) and finally the smaller body parts(hands and feet) this sees larger mass and low velocity parts transfer momentum to smaller body parts and greater velocities.
Forces can produce movement or change the motion of an object
Force = mass x acceleration
= m x a
Inertia
An object will remain in a state of rest or constant motion unless acted upon by an external force. Inertia is a tendency for a body to resist change in its state of motion whether that be at rest or moving with a constant velocity
Newtons Laws of Motion
FIRST LAW
- A body will remain at rest or in a state of constant motion unless acted upon an external force.
A ball will continue in the air unless acted upon by an external force. The ball won’t move until it has been kicked (force applied).
SECOND LAW
- A force applied to an object will produce a change in motion (acceleration) in the direction of the applied force that is directly proportional to the size of the force.
Shot-put and discus. Shotput, an object with a much greater mass than the discus, must be thrown with much more force than the discus to the same acceleration.
THIRD LAW
- For every action there is an opposite and equal reaction.
If you press a stone with your finger, the finger is also pressed by the stone.
Friction
Is just one of many forces
(incluiding gravity, weight, air & water resistance)
That can be applied to objects
Friction happens when two objects come into contact with each other and it opposes motion of the object(s)
Increased friction can be good
Friction between the bowling ball and bowling lane is good. The more oil on the lane means the ball is slow down less and the harder it is for the bowler to send the ball in a curved path.
Decreased friction can be good just like in Downhill Skiing
Angular Momentum
Angular momentum is conserved when a body is in flight and there is an inverse relationship between angular velocity and moment of inertia
Summation of momentum
Summation of momentum – also known as summation of force or the kinetic link principle
Maximum velocity is created when momentum is generated in a sequential or summed manned from larger body parts close to the center of gravity to those further away
e.g. – when throwing or kicking a ball, momentum is generated at the waist (hips and trunk) and then transferred to the limbs ( arms and legs) and finally the smaller body parts(hands and feet) this sees larger mass and low velocity parts transfer momentum to smaller body parts and greater velocities.