Biomechanics 5

Question 1

what is linear motion

Answer 1

motion in a (straight or curved) line with all body parts moving at the same speed, in the same direction, at the same time

Question 2

what is distance and it’s equation

Answer 2

how much ground is covered when in motion from one position to another. speed x time (m)

Question 3

what is displacement and it’s equation

Answer 3

shortest straight line route between two positions. velocity x time (m)

Question 4

what is speed and it’s equation

Answer 4

the rate at which an object travels a distance. distance/time. (m/s)

Question 5

what is velocity and it’s equation

Answer 5

the rate of change of speed (or displacement) in a given direction. displacement/time (m/s)

Question 6

what is acceleration/deceleration with equation

Answer 6

the rate of change of velocity/change on velocity in the time taken to make the change (positive or negative).

change of velocity/time. (m/s^2)

Question 7

what is linear motion created by

Answer 7

a direct force which passes through the centre of mass of the body

Question 8

interpret a distance/time graph

Answer 8

• stationary body
  / constant speed
  ( curved line with decreasing gradient, decreasing speed
  ) curved line with increasing gradient, increasing speed

Question 9

interpret a speed/time graph

Answer 9

• constant speed
  \ decreasing speed
  / increasing speed/acceleration
  ( positive but decreasing gradient, accelerating

Question 10

interpret velocity/time graphs

Answer 10

\ line with increasing negative velocity
, acceleration in a changed direction
/ deceleration in the changed direction (to stop if the line reaches the x axis)

Question 11

what is newton’s first law

Answer 11

a body continues in a date or rest/uniform velocity unless acted upon by an external force

Question 12

what is newton’s first law also known as

Answer 12

law of inertia

Question 13

what is velocity

Answer 13

rate if change in displacement (the shortest straight line route between start and finish). it is speed in a given direction

Question 14

what is newton’s second law

Answer 14

a body’s rate of change in momentum is proportional to the size of the force applied and acts in the same direction as the force applied

Question 15

what is the newton’s second law also known as

Answer 15

law of acceleration

Question 16

how to maximise acceleration

Answer 16

increase size of force (dependent on velocity/speed of equipment) and increase the mass of object used to increase force (heavier equipment to increase acceleration as long as velocity is not lost)

Question 17

what is newton’s third law

Answer 17

for every action force applied to a body there is an equal and opposite reaction force (eg basketballer jumps and applied force on the ground that applied an equal/upward reaction force on the player)

Question 18

what is newton’s third law also known as

Answer 18

law of reaction

Question 19

describe centre of mass

Answer 19

-point at which a body is balanced in all directions- point of concentration of mass
-com changes position and can move outside the body
-can be affected by weight and position of a body

Question 20

what is stability and what affects it

Answer 20

-ability of a body to resist motion and remain at rest and the ability to withstand force applied and return to its original position without damage (ie balanced)

-position of com: the lower, the more stable
-base of support: the larger the base the more stable
-line of gravity: the more central line of gravity to the base of support the greater
-mass of the body: the greater mass, greater inertia, greater