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66 Cards in this Set
- Front
- Back
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Dynamics (def)
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When force applied does not change shape of object
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Force (examples)
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Gravity, tension, weight
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Force (def)
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A push or a pull
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Every structure in the movement of the body does so according to ______ and _________ principles
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physical and physiological
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What is significant about Edward Muybridge's study of horses?
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the horse could be understood like a machine
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Anthropometics (def)
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study of the body's size and form
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What did Borelli compare?
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The body to a system of levers and how lead effects them
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Kinematics (def)
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How far
How long How fast How big is he/she --- The movement: stride length, arm motion, foot position, posture, breathing, speed mass, acceleration |
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Kinetics (def)
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What friction is under feet
What force on joints What tension in muscles ----- Friction: gravity, air resistance, muscle force |
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1 m = ?ft
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3.28ft
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1 m - ? inches
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39 inces
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F = ___ * ___
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m*a
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____ = m*a
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F
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Speed and velocity are measured in:
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milers per hour or m/s
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acceleration is measured in:
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m/s/s
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Inertia
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Resistance to a change in state of motion
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Mass (def)
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how much matter there is in a body
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Greater mass = Greater _____
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inertia
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Units of mass
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kg or slugs (english)
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Is mass the same as weight?
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no
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We can look at every activity as getting masses to _____ and _____.
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speed up and slow down
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3 Basic dimensions
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length, time, mass
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Force (def)
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a push or a pull
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Force (examples)
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friction, gravity, weight
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Muscles can only (push or pull?)
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pull
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Magnitude (def)
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how big a force is
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Characteristics of a force (4)
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Magnitude
Direction Point of application Line of action |
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Vector is represented with a ___
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arrow
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Vector quantity is made up of:
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magnitude and direction
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In a vector the arrow represents:
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direction
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in a vector the stick of the arrow represents:
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magnitide
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Garfield example: why impossible?
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there is no outside force
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Internal force (def)
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acts within the object of system whose motion is being investigated (dont change motion of body)
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tensile as it relates to internal forces:
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internal pulling
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compressive as it relates to internal forces:
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internal pushing (squeezing)
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Internal force (ex)
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clothing when looking at subject as a whole
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GRF
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Ground reaction force: pushes up on you from ground
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External force (def)
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acts on object as a result of interaction with the environment surrounding it (change motion of body)
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TRUE/FALSE: muscles dont move us in the environment
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true: we manipulate external forces to cause our body to move
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External force: Noncontact
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occur even if object are not touching eachother
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External force: Noncontact examples
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gravity, magnetic
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External force: Contact
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occure between objects in contact
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External force: Contact examples
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fluid (air & water resistance)
Rection forces with another body (ground, implement) |
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vertical rectionforce occurs:
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perpendicular to body
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shear reaction force occurs:
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parallel to body
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free body diagram (def)
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sketch that sows a defined system in isolation with all the external forces acting on the system
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mechanics (def)
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concerned with the effects of forces acting on objects
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net force (def)
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overall effect of multiple forces acting on a body
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Newtons 1st law:
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Law of Inertia:
a body in motion will stay in motion and a body at rest will stay at rest unless acted upon by an unbalanced external force. |
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Newtons 2nd law:
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Law of acceleration:
An unbalanced force applied to a body causes an acceleration of that body |
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Newton's 3rd law:
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Law of action-reaction:
for ever action, there is an equal and opposite reaction. |
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For every pus/pull there are how many bodys?
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2
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Acceleration means a change in:
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velocity
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Velocity (def)
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how fast and what direction object is going
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Bigger mass = (bigger/smaller) acceleration
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smaller
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Smaller mass - (bigger/smaller) acceleration
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bigger
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Newton - N (def)
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amount of force necessary to accelerate a mass of 1 kg at 1m/s^2
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1N = __kg * ___ m/s/s
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1 and 1
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pythagoras theorem
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a^2 + b^2 = c^2
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SIN =
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opp/hyp
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COS =
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adj/hyp
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TAN =
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opp/adj
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Friction (Def)
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component of a contact force that acts parallel to the surface in contact.
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Static friction (def)
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surfaces not moving relative to eachother
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Dynamic friction (def)
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surfaces move relative to eachother
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Motive force (def)
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way of applying force
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