Biomechanics Flashcards
Measurements used within linear motion are split in to scalar and vector quantities, describe each.
Scalar: measurements that only have size. Vector: measurements that have size and direction.
Give examples of vector quantities
Weight, acceleration, displacement, velocity and momentum.
Give examples of scalar quantities
Mass, distance and speed.
Describe how vectors are usually represented.
With the use of an arrow. The longer the arrow, the greater the size. Direction is shown by point and line of application
What is mass and how is it measured.
The quantity of matter the body possesses. Measured in KG.
How is weight different to mass
Weight is the force on a given mass due to gravity
How is weight calculated and measured
Weight (Newton’s) = mass (kg) X gravity (9.8m/s2)
What is the difference between distance and displacement.
Distance: The path a body takes as it moves from start to finish. Displacement: shortest route in a straight line between start and finish.
How is speed calculated.
Speed (m/s) = distance covered (m) ÷ time taken (s).
How is velocity calculated
Velocity (m/s) = displacement (m) ÷ time taken (s).
Describe the distance time graphs labelled B and E.
B: The distance run is changing at a constant rate at a constant speed. E: Less distance is travelled in a certain amount of time, deceleration is occurring.
Below is a velocity time graph. When the line falls below the X axis, what does this represent.
When the line goes below the X axis, there has been a change in direction.
What is represented by the line between 10-15 minutes.
The performer is travelling at a constant velocity.
What is represented between 0-10 minutes.
The performer is accelerating as there is an increase in velocity.
What is acceleration and how is it measured
Acceleration is the rate of change of velocity. Measured in m/s2.
