Biomechanics

Question 1

Scalar

Answer 1

Magnitude
Mass
Distance
Speed

Question 2

Vector

Answer 2

Magnitude and direction
Weight
Acceleration
Displacement
Volocity
Momentum

Question 3

Weight

Answer 3

Gravitational force exerted on the body

Question 4

Mass

Answer 4

Quantity of matter in the body

Question 5

Distance

Answer 5

Path body takes from start to finish

Question 6

Displacements

Answer 6

Shortest route in a straight line between starting and finish point

Question 7

Speed

Answer 7

Bodies movement per unit of time with no reference to direction

Question 8

Volocity

Answer 8

Rate of change of displacement
Displacement/ time taken

Question 9

Acceleration

Answer 9

Rate of change of Volocity
Change in velocity/ time

Question 10

Momentum

Answer 10

Mass x velocity

Question 11

Forces acting in performer during linear motion
Internal

Answer 11

Generated by the skeletal muscles

Question 12

Forces acting in performer during linear motion
External

Answer 12

Comes from outside the body
Friction
Air resistance
Weight
Gravity

Question 13

Vertical forces

Answer 13

Gravity- greater mass, greater weight force pulling downwards
Reaction force- two bodies contact

Question 14

Horizontal forces
Friction

Answer 14

Static- forces exerted on ones surface, no motion between surfaces (before)
Sliding- two bodies contact and skip abs slide over each other
Skiing, friction opposes motion, forward direction

Factors affecting
Surface characteristics (spikes)
Temperature of two surfaces
Mass of object

Question 15

Horizontal force
Air resistance

Answer 15

A force that acts in the opposite direction to motion of a body travelling through the air

Depends on
Volocity
Cross section
Shape and surface characteristics

Question 16

Impulse

Answer 16

Force x time
Newton seconds
Increase impulse increase rate of momentum causes a change in velocity

Question 17

Net impulse

Answer 17

Combination of positive and negative impulses

Question 18

Positive impulse

Answer 18

Start of race accelerating

Question 19

Zero impulse

Answer 19

Middle of race
Positive and negative are equal
Constant velocity

Question 20

Negative impulse

Answer 20

End of race
Decelerating

Question 21

Angular motion

Answer 21

Movement around a fixed point
Occurs when a force is applied outside the centre of mass

Question 22

Torque

Answer 22

Turning force, causes an object to turn about its axis of rotation

Question 23

Angular motion in relation to Newtons laws

Answer 23

1
A rotating body will continue to turn about its axis of rotation with constant angular momentum unless an external force (torque) is acted upon it
2
The rate of change of angular momentum of a body is proportional to the force (torque) causing it and the change that takes place in the direction in which the force (torque) is being applied
3
When force (torque) is applied by one body to another the second body will exert an equal and opposite force (torque) on the other body

Question 24

Angular displacement

Answer 24

Smallest change in angle between the start and finish point of rotation
Radians
57.3

Question 25

Angular velocity

Answer 25

Rate of change of angular displacement Ad/ time

Question 26

Angular acceleration

Answer 26

Rate of change of angular velocity Radians2 Change in av/ time

Question 27

Moment of inertia Mass of an object

Answer 27

Increase mass Increase resistance to change So increase moment of inertia

Question 28

Moment of inertia Angular momentum’s

Answer 28

Moment of inertia x angular velocity Open body- increase displacement of mass- increase MoI- slow to spin Closed body- decrease displacement of mass- decreases MoI- increase spin

Question 29

Projectile motion Horizontal displacement

Answer 29

Shortest distance from starting point to finishing point in a line parallel to the ground

Question 30

Projectile motion Factors affecting HD

Answer 30

angle of realises Speed of realises Height of release

Question 31

Factors affecting HD Angle of release

Answer 31

Release height = landing height 45 Release height- landing height +45 Release height+ landing height -45

Question 32

Factors affecting HD Speed of release

Answer 32

Greater velocity of projectile greater HD traveled

Question 33

Factors affecting HD Height of release

Answer 33

Greater height of release greater HD

Question 34

Factors affecting flight path Parabola

Answer 34

A curve with matching left and right Sides Weight and air resistance

Question 35

Factors affecting flight path True parabola

Answer 35

Projectiles with a larger weight have small air resistance Shot put

Question 36

Factors affecting flight path Distorted parabola

Answer 36

Lighter mass increases effects of air resistance Deviates from true parabola Shuttle cock

Question 37

Factors affecting flight path Vector component Horizontal and vertical

Answer 37

H- horizontal motion of an object V- upward motion of object

Question 38

Drag force

Answer 38

Force that acts in the opposite direction to nation Has a negative effects on velocity

Question 39

Types of drag

Answer 39

Surface drag- friction between surfaces and environment Summers will wear specialised clothing and shave Form drag- effect from environment. Streamline position

Question 40

Factors affecting drag

Answer 40

Velocity of moving body Cross section area Shape and surface characteristics

Question 41

Factors affecting drag Velocity of moving body

Answer 41

Increase velocity increases drag

Question 42

Factors affecting drag Cross section

Answer 42

Increase CS increase drag Tour de France- low to handle bars

Question 43

Factors affecting drag Shape and surface characteristics

Answer 43

Streamline/ aerodynamic Shuttle cock has feathers and light so looses speed quickly