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30 Cards in this Set
- Front
- Back
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force
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push or pull
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vector
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mathematical equation of anything defined by its size or magnitude and its direction
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weight
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w=mg
ex. 59kg X 9.8 if wt lbs change to kg. weight divided by 2.2 |
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static vs dynamic friction
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static- dry friction between surfaces not moving
dynamic- dry friction between surfaces movong relative to each other |
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weight vs mass
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mass meas of linear inertia. scalar. kg
wt meas of force of gravity. vector. N |
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linear motion
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or translation
occurs when all pts of body or object move the same distance in same direction at same time rectilinear and curvilinear translation |
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rectilinear translation
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all pts on body or obj move in a straight line so the direction of motion does not change. all pts move same distance
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curvilinear translation
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all pts move so orientation of obj doesn't change and all pts move same distance. direction of motion canstantly changing
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angular motion
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or rotary motion/rotation occurs when all pts on a body or object move in circles about same fixed central line or axis
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general motion
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combination of angular and linear motions. ex running walking because trunkbis linear limbs angular
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linear kinematics
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angle or line of motion object moves. descrip of motion. speed velocity ex curvilinear angular
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distance vs displacement
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dis traveled length of path from st to end. displace. meas straight line initial pt to end pt. vector
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speed vs velocity
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speed rate of motion.. rate of distance traveled
velocity rate of motion in specific direction rate of displacement vector |
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instantaneous velocity
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velocity of object at an instant in time
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uniform acceleration
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acc is constant doesnt change. occurs when net force is constant not changing
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vector quantities
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size and direction
acceleration velocity displacement |
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horizontal projectile
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constant. vertical velocity constantly chg at rate of 9.81.. any object flying through air has both
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linear kinetics
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forces acting on an object. ex push or pull
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newtons first law
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every body continues at state of rest or uniform motion in straight line unless compelled to chg by forces
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linear momentum
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product of objs mass and linear velocity.. faster obj moves more momentum
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coefficient of restitution
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absolute value of the ratio of the velocity of separation to the vel of approach. vel of separ is diff between vel of two colliding obj after collision (how fast moving away from each other.) vel of approach is diff between vel of two obj before collision
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newtons second law
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chg of motion of an obj is proportional to force impressed and is made in direction of straight line in which force is impressed
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impulse
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product of force and time during which the force acts
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newtons third law
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every action has an equal and opposite reaction
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impulse momentum relation
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increase duration forced applied increases ch in momentum
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work
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product of force and amount of displacement in direct of that force. unit joule or Nm
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energy
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capacity to do work
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kinetic energy vs potential energy
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energy due to motion vs energy due to position
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strain energy
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energy due to deformation of an object
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power
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how quickly or slowly work is done
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