exam - biomechanics

Question 1

linear motion

Answer 1

straight line

Question 2

momentum

Answer 2

mass x velocity

Question 3

newtons 1st law

Answer 3

an object will remain at rest unless acted upon by a force

Question 4

newtons 2nd law

Answer 4

acceleration - force applied will produce a change in motion

Question 5

newtons 3rd law

Answer 5

action- for every action there is a equal and opposite reaction

Question 6

external forces that act upon an object/body

Answer 6

1. gravity
2. mass
3. force
4. acceleration

Question 7

angular motion

Answer 7

angular motion involves rotation around a central axis or a fixed point. examples are : twirling in ice, skating or doing a pivot in netball

Question 8

displacement

Answer 8

change of position of a body, the start and finish are the same, therefor resulting in 0 displacement

Question 9

factors affecting path of projectile

Answer 9

height of release
speed of release
height of release

Question 10

what can be done to increase stability

Answer 10

• body mass
• friction between body/surface
• base of support
• position of the centre of gravity

Question 11

spins

Answer 11

top - causes the ball to drop more quickly that it would without spin
back - floats, has lower length and distance
side - curves, follows a curved path

Question 12

summation of momentum

Answer 12

the sequential and coordinated movement of each body segment to produce maximum velocity

Question 13

projectile motion

Answer 13

an airborne body that is affected by the forces of gravity one air resistance, anything that is launched into the air and affected only by the forces of gravity and air resistance can be considered projectile, factors influencing flight path

Question 14

torque

Answer 14

the turning effect of a force, torque is the tendency of an object to rotate
force x lever arm force
greater the torque = greater the angular acceleration

Question 15

inertia

Answer 15

refers to the resistance of a rotating object to change its state of motion, the tendency of an object to resist change in its state of motion

Question 16

force

Answer 16

push/ pull

Question 17

friction

Answer 17

increasing the friction between the body and the surfaces it is in the contact with increases with stability of the body, the reduction in friction means that the stability of the skier or bobsled rider is easier to disrupt

Question 18

high momentum of inertia

Answer 18

• greater momentum
• hard to control
• low accuracy
• low acceleration

Question 19

low moment of inertia

Answer 19

• easy to control
• high accuracy
• high acceleration
• lower momentum

Question 20

levers

Answer 20

1st - axis
2nd - resistance
3rd- force `

Question 21

acceleration

Answer 21

rate of change of velocity over time

Question 22

velocity

Answer 22

displacement divided by the change in time

Question 23

coefficient restitution (rebound)

Answer 23

1. contact surface
2. temperature
3. impact velocity