Motion
What is Linear motion
Linear motion – Refers to all objects or parts travelling the same distance, in the same direction, at the same time. It refers to an individual, body parts or objects such as sports equipment. Examples of linear motion include tobogganing, diving and the forward movement of the upper body while running or walking.
what is Static balance and give an example?
This occurs when a body is not moving, for example, when a gymnast balances on a beam or a performance.
What is Buoyancy?
The ability of the body to float in water is called buoyancy.
What is Newtons 3rd Law of Motion?
Every action has an equal and opposite reaction
what is Angular motion?
Refers to motion in a curved or circular path. An example is the movement of a hammer thrower or discus thrower preparing for release.
What is the bodys Centre of gravity?
The Centre of Gravity of an object is the point at which all the weight is evenly distributed and which the object is balanced
Does body density influence how we float? why?
Yes, Body density also affects the way we float. Thin people have greater density and tend to sink whereas people carrying higher proportions of fat have lower density and tend to float.
What is Applied Forces?
Are generated by muscles working on joints and are applied to surfaces.
What is Momentum?
Refers to the amount of motion possessed by a moving object. The momentum of a body can be changed by altering its mass or velocity. The greater the momentum of the body, the harder it is to change it
what is the Line of gravity?
The LOG is an imaginary vertical line passing through the COG and extending to the ground. It must be located within the supporting base to increase stability.
What is Drag?
Drag is the force that opposes the forward motion of an object, reducing its speed and velocity. A good example of this is when a swimmer pushes off the wall. The body needs to be streamlined to act best against the drag placed on it.
How does the body Absorb Force?
Forces exerted on the body are absorbed through the joints. Joints produce flexion and bend to help absorb the shock of landing and catching objects
What is Acceleration?
Acceleration occurs when the motion is speeding up.
The ability to accelerate depends largely on the speed of muscular contraction.
what is the Base of support?
The larger the base of support, the greater the stability. A wide base of support (e.g. placing your feet wide) will give a person greater stability. A narrow base of support decreases a person’s stability.
What is lift?
Lift is the component of force that works at right angles to the drag and keeps things in the air
What are 2 things to take into consideration when Applying Force to an Object?
Quantity of force applied to an object – greater the force applied = greater the acceleration
Mass of an object – if its increased in either weight or size more force is required to move the object the same distance
Give an example of when Linear and angular motion are combined
in running the arms and legs move in angular motion while the upper body moves in linear motion.
When making a tackle in rugby, what are generally the 2 most important aspects of balance & stability?
Centre of gravity & base of support
what is the The Magnus Effect?
A spinning ball creates a section of high pressure, air flow on the side of the ball that is spinning towards the direction of its flight. This adds increased surface drag over that side of the ball. On the opposite side of the ball, low air pressure results as the ball is spinning in the same direction as the air flowing past it, where it encounters less drag resistance. As a result of this, the ball will curve towards the side of low pressure. This is known as the Magnus Effect.
How does one increase power in regards to force?
An increase in strength or speed, at which muscles contract, result in an increase in power, and more force applied.