What is Force (Biomechanics), External forces, and linear kinematics

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curvilinear translation

direction of motion change although orientation of the object does not change

Displacement

displacement is the straight line distance in specific direction from initial to final postion.

velocity (rate of displacement)

displacement/ change in time

what can force do?

force can accelerate an object

Is force a vector quaunity?

force is a vector quanity

weight

force of gravity

concurrrent forces

forces that DO NOT act on the same line but do act on the same point.

External forces

forces that act on an object as a result of its interaction with the environment surrounding it. external force examples contact force, non contact force, friction, normal, gravity

Collinear forces

forces that have the same line of action

contact forces

forces that occur between objects in contact with each other

Sports excercise the only non contact force acts upon us is...

gravity

normal force (R)

is a force that is perpendicular to the surface that an object contacts.

ligament

is between bone to bone to keep structure.

Ground reaction force

is equal in magnitude and opposite in direction to the forces that the body exerts on the supporting surface through the object

what are three things about friction

is proportional to the normal force is independent of the size of surface size it is proportional to the roughness of surface area

rotary

motion in rotation

tendon

muscle bind to a bone

INTERNAL FORCES DO NOT!!!

produce any change in the motion in the motion of our body

Vector

size (magnitude) and direction (orentation)

which friction is greater static or kinetic

static is greater that kinetic

position

the location in space

ascending

time to maximum height

Force enables us to

walk, run, change direction, stand still.

Force of gravity acting on an object?

weight

descending

when the ball is falling before it hits the ground

Net force is ZERO

when the object is not moving because the normal force is equivalent to weight ( gravity). also the object is moving at a constant velocity.

Is displacement a vector?

yes

Net force a vector quantity

yes

acceleration (rate of change in velocity)

change in velocity/ change in time

Linear Kinematics

concerned with the description of linear motion

non contact force

Forces that act on an object without physically coming into contact with it.

Internal forces

Forces that actually within an object both tensile and compressive forces example body system structures such as organs, bones, muscles, tendons, ligaments cartilage etc..

In a horizontal motion of a projectile does the ball accerate horizontally while in the air does the ball speed up or slow down

No!!! its remains constant with its horizontally velocity and vertical acceleration.

Force equation: 1N equals

1kg mass x 1m/s2 or F= ma

how to calculate total time in projectile motion

2x maximum height

gravitational acceleration (g) equals

9.81 m/s2

Force

A push or a pull

Rectilinear translation

Direction of motion doesn't change

Speed (rate of Distance)

Distance/Change of time

How do we calculate friction?

F= uR

kinematics

The branch of dynamics (mechanics) concerned with the description of motion independent of force which cuase motion.

Friction force

The contact force that acts to oppose sliding motion between 2 surfaces

Net force

The sum of all forces acting on an object

can Force can come in pairs?

Yes force can come in pairs Action and reaction

what us a free body diagram used for?

a tool for analyzing forces and torques. a drawing to identify all external forces acting upon a object.with arrows showing an application and direction being applied on the object.

Motion

action or process of a change in position.

mass

amount of matter

why we use velocity in biomechanics and not speed?

because we care about direction we quantify the acceleration.


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