Kines 162 Exam 1 Terms & Definitions for Physics

Goals of Physics in Sport and Exercise

Performance improvement

technique improvement

equipment improvement

technique improvement

injury prevention and rehabilitation

Kinematics

Deals with the description of motion without considering the forces that cause motion.

Kinetics

Deals with the relationship between the motion of bodies and the forces acting upon them

length & distance

describes space in which movement occur

describes position of player, or how far they ran

Basic SI Units

Length = meter

Time = Sec

Mass = kilograms

Scalar

Magnitude only

mass, volume, density, distance & speed

Vector

magnitude & direction, orientation, point of application

displacement

force

velocity & acceleration

Time

Highly valuable metric in sports, exercise, physical activity, research

basic aspect for motion

Mass & Inertia

inertia is the property of an object to resist change in its motion

mass is the measurement of inertia

1 inch =

2.45 cm = 0.00254 m

1 foot =

30.48 cm = 0.3048 m

1 yard =

0.9144 m

1 mile =

1.609 km

1 cm =

10 mm

1 m =

100 cm

1000 m =

1 km

Qualitive

non numerical description

direct observation

Quantitive

numerical result

data from motion capture

reference system

necessary to specify position of the body, segment, or object so as to describe motion or identify whether any motion has occurred

linear kinematics variables

position refers to location of object in space relative to a reference system

distance refers to total path traveled

displacement refers to shortest path between start and end point

average vs instantaneous

change in time over certain distance, versus distinct value at specific point in time and space

stride length - stride rate relationship

at specific velocities stride lenght stops increasing

Position - velocity - acceleration

graphical representation/illustration

relationship of the tangential slope at each data point

dirivative

rate at which a value changes with respect to another value

components of projectile motion

any object that is thrown or projected into the air

they follow a curved path

horizontal motion

motion that is parallel to the ground

Vertical motion

any projectile thrown straight up in the air

has no forward motion

projectile motion in sport

time of flight, peak height, horizontal displacement

relative angle

included angle between two segments

absolute angle

angular orientation of a body segment with respect to a fixed line of reference

right hand rule

determines direction of rotations in terms of positive or negative

thumbs up positive

thumb down negative

planes and axes of motion

angular to linear relationship

angular motion of shoulder and wrist for softball swing

linear motion of the arm and the ball it hit.

3 main measurements

length/distance, time, mass/inertia