Biomechanics Flashcards
What is the difference between quantitative and qualitative analysis?
Quantitative looks at the numerical data whereas qualitative is the quality of the performance
What is quantitative analysis based on?
Measurement of kinetic (force) and kinematic (distance, speed, acceleration) variables
What is goniometry?
The measurement of joint angles
What is electromyography?
Records the electrical activity within a muscle just prior to contraction
What is force defined as?
A push or pull
In what ways can forces affect objects?
- change shape of object
- move the object
How can force be calculated?
Mass x acceleration
What is gravity?
A constant force that acts through the centre of mass of an object towards the earth
What is friction?
Occurs when two surfaces come in contact with each other
What is drag force?
When an object moves trough air or water
What is mass?
The measure of the amount of matter na object is mad duo of
What are the units for mass?
Kilograms
What does weight refer to?
The force that is exerted on the body by gravity.
How can weight be determined?
Mass x gravity
What are the units for weight?
Newton’s
Is inertia?
The tendency for a body to resist a change in its state of motion
Is it harder or easier to change the state of motion of an object with greater levels of inertia?
Harder
What is momentum?
The measure of the amount of motion an object has and its resistance to changing that motion.
What are the units for momentum?
Kg m/s
What is the equation to determine the momentum of an object?
Mass x velocity
What is the equation for weight?
Mass x gravity
What are sporting examples of friction?
- chalk increases friction and therefore grip for weightlifters and gymnasts
- polished skis reduce friction and increase speed
What are sporting example that reduce drag forces?
In swimming the swimsuits, caps, body position all reduce drag forces in the water to increase speed
How much momentum does an object at rest have?
None