# Basic Concepts of Biomechanics

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What is linear motion?
The straight line or curved progression of an object as a whole e.g. a skier turning in a curve or going straight
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What is angular motion?
When an object acts as a radius and moves in a circular path around a set point e.g. the lower leg kicking a rugby ball
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What is general motion?
A combination of linear and angular motion e.g. running
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What is inertia?
The resistance a body has to a change in its state of motion
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What is force?
It is often described as pushes and pulls on a body/object
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What is mass?
The quantity of matter that a body contains. The weight of an object is proportional to its mass
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What is centre of mass?
The point where the mass of an object is concentrated. It is the object's point of balance
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What can a force do?
change the shape of a body, change the direction of a moving body, accelerate a moving body, slow down or stop a moving body, to move a body which is at rest
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What does the effect a force has depend on? (S.A.D)
It depends on the size of the force, where you apply the force and the direction of the force
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What is Newton's FIRST law of motion?
'A body continues in a state of rest or uniform velocity unless acted upon by an external force' - A golf ball will stay on the tee until the golfer strikes the ball with their club
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What is Newton's SECOND law of motion?
'The acceleration of an object is directly proportional to the force causing it and is inversely proportional to the mass of the object' (F=ma) - A hockey ball will accelerate faster if the ball is hit with a greater force by the hockey player
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What is Newton's THIRD law of motion?
'For every action there is an equal and opposite reaction' - When a batsman in cricket hits a ball with their bat, the cricket ball exerts an equal but opposite force on the cricketer's bat
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What are the three factors affecting stability?
The position of the centre of mass, position of the line of gravity, size of the area of support
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Why is a headstand more stable than a handstand?
There is three points of contact with the floor, a larger base of support and the centre of mass is lower whereas a handstand has a narrow base and a higher centre of mass
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## Other cards in this set

### Card 2

#### Front

What is angular motion?

#### Back

When an object acts as a radius and moves in a circular path around a set point e.g. the lower leg kicking a rugby ball

### Card 3

#### Front

What is general motion?

What is inertia?

What is force?