Biomechanics: measurements used in linear motion

Question 1

Define linear motion

Answer 1

• Linear motion is a motion in a straight or curved line, with all body parts moving at the same distance at the same speed and the same time.

Question 2

Define mass

Answer 2

• The quantity of matter a body possesses.
• Mass is constant.
• Measured in KG.

Question 3

Define weight

Answer 3

• The force on a given mass by gravity.
• Weight= mass x gravity.

Question 4

Define distance

Answer 4

• The length of the path the body follows when moving from A to B.

Question 5

Define displacement

Answer 5

• The length of a straight line from A to B.

Question 6

Define speed

Answer 6

• The rate of change of position.
• Speed (m/s) = distance/ time.

Question 7

Define velocity

Answer 7

• The rate of change of displacement.
• Velocity is speed with direction.
• Velocity (m/s)= displacement/ time.

Question 8

Acceleration and deacceleration

Answer 8

• Acceleration and deacceleration is ‘the rate of change of velocity’.
• They are directionally aware.

Question 9

Define acceleration

Answer 9

• The rate of increase in velocity.

Question 10

Define deacceleration

Answer 10

• The rate of decrease in velocity.

Question 11

Define a Scalar quantity

Answer 11

• Scalar quantities only take into consideration magnitude (size).

Question 12

Define a Vector quantity

Answer 12

• Vector quantities take into account direction and magnitude.