exam 2 unit 4 biomechanics kinematics

whats distance

total amount of travel covered

whats displacement

difference in distance from start to end points

define angular displacement

directional displacement specifically how far around the center point

(forward + or back -)

how is Angular displacement used to measure rotational movement

measures the exact angle the record has turned,

define speed

how much ground is covered

equation for speed

speed= distance / time

define velocity

how fast and what direction something moves

equation for velocity

velocity= speed / time

define acceleration

any change in velocity over time

change in velocity / change in time

factors that influence changes in velocity

-mass

-direction of force

-net force (PUSH/PULL)

DEFINE MOMENTUM

measure of how difficult it is to stop a moving object

factors that influence momentum

mass

velocity

equation for momentum

Momentu,(P)= mass x velocity

define principle of conversion

when 2 objects colide each object has it’s own momentum

conversion of momentum in sports

baseball and bat collide so the momentum from bat is higher causing ball to go against the regular direction

define coefficient of restitution

when a object is compressed how fast it goes back to regular shape

how does coefficient influence behavior of objects in collisions

momentum is the main factor but coeddifcenr indicated how the object REACTS when hit

define agular momentum

rotated version of linera inertia (how hard it is to stop a spinning object)c

equation for angular momentum

moment of inertia x angular velocity

how does change in body position influence rotatable movement

change in body shape helps speed /slow down rotational without outside force