Biomechanics

Question 1

Biomechanics

Answer 1

the science concerned with the internal and external forces acting on the human body and the effects they produce on the body.

Question 2

force

Answer 2

a pushing or pulling action that causes a change of state (rest/motion) of a body.

(mass)(acceleration)

Question 3

Speed

Answer 3

describes the rate at which a body moves from one location to another

Distance / Time

Question 4

Distance

Answer 4

the length of a path that a body traveled

Question 5

Displacement

Answer 5

the length of a straight line connecting the start and finish points .

Question 6

velocity

Answer 6

tells you how fast something is moving but also in what direction

Question 7

acceleration

Answer 7

the rate at which velocity changes over time

Change in velocity / time

Question 8

momentum

Answer 8

mass in motion.

mass x velocity

Question 9

impulse

Answer 9

amount of force you apply for a certain amount of time to cause a change in momentum

Question 10

center of mass

Answer 10

the point at which the body is balanced in all directions.

Question 11

fosbury flop

Answer 11

the jumper transfers their center of mass through or beneath the bar, allowing them to position their body to clear the bar.

Question 12

lever

Answer 12

rigid structures hinged at one point (fulcrum) to which forces are applied to two other points (effort and load).

Question 13

first class lever

Answer 13

Fulcrum lies between the effort and the load
EFL
example - tricep extension

Question 14

second class lever

Answer 14

fulcrum lies on one end, with the effort on the other side and the load in the middle.
ELF
ex: standing heel raise

Question 15

third class lever

Answer 15

effort lies between the load and the fulcrum
LEF
ex: hitting with baseball bat

Question 16

Newtons 1st law

Answer 16

an object in motion will stay in motion until acted upon by an unbalanced force

Question 17

Newtons 2nd law

Answer 17

Force = (Mass)(Acceleration)

Question 18

Newtons 3rd law

Answer 18

for every action, there is an equal and opposite reaction.

Question 19

Conservation of Momentum

Answer 19

momentum is neither gained or lost within a closed system. total momentum before a collision equals the total momentum after

Question 20

Angular momentum

Answer 20

A measurement of an objects tendency to continue to spin.
(Angular velocity) (moment of inertia)

Question 21

Moment of inertia

Answer 21

the distance from the rotational axis

Question 22

angular velocity

Answer 22

the number of revolutions per minute

Question 23

projectile

Answer 23

an object that has been thrown vertically upwards or at an angle, following a parabolic path and is subject to the force of gravity

Question 24

Factors affecting projectile motion

Answer 24

Release velocity - greater release velocity produces greater distance

Angle of release - optimum angle of release, between 35 and 45 degrees, produces greater distances.

Height of release - the greater the height of release the greater the distance.

Question 25

The Bernoulli principle

Answer 25

As the velocity of a fluid increases, the pressure exerted by that fluid decreases.