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23 Cards in this Set
- Front
- Back
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nonzero net force
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produces an acceleration
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Newton's 1st Law of Motion
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*law of inertia
*when (Fnet=0), a body at rest remains at rest, and a body already in motion remains in motion w/ a constant velocity |
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Newton's 2nd Law of Motion
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*Fnet=ma
*acceleration of an object is directly proportional to the net force acting on it, and inversely proportioinal to its mass |
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Newtons 3rd Law of Motion
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*F12=-F21
*for every action(force), there is an equal and opposite actin (force) |
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Inertia
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resistance to change in motion
directly proportional to mass |
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Translational Equilibrium
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*when net force acting on object is 0
*object is at rest or at constant velocity |
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Work
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*work= product of magnitude of displacement and component of force parallel to that displacement
*Fcos(angle)d *W=Fd |
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Kinetic Energy Formula
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(0.5)mV^2
one half x mass x velocity squared |
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Work Energy Theorm
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W=Change in K
K-K(initial) |
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Gravitational Potential Energy Formula
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U=mgy
mass x gravitational acceleration x height |
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Elastic Potential Energy Formula
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U=(0.5)kx^2
one half x spring constant x distance spring is from original location |
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Formulas for conservative forces only
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E(initial)=E
.5mV(initial)^2+U(initial)=.5mV^2+U |
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Non Conservative Forces formulas
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E(initial)=E + Work Friction
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Work of nonconservative forces formula
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change in E
E-E(initial) |
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Power
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rate at which work is done
P=Work/time P=FV(average) in Watts |
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Efficiency
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measure of what you get out for what you put in
Eout/Einx100 Wout/Einx100 Pout/Pinx100 |
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Linear Momentum
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vector quantity equal in magnitude to product of mass/velocity
p=mV SI unit: kg*m/s |
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Impulse
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change in linear momentum
F*change in time= vector quantity equla in magnitude to product of 1.force and 2. time interval in which it acts. direction is same as force. |
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Law of conservatioin of momentum
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total linear momentum of an isolated system of bodies remains constant.
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What is conserved in all collisions and why?
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momentum is conserved b.c external force is 0.
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Elastic Collisions
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total momentum and total kinetic energy is conserved
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For any elastic head-on collision...
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relative speed of 2 objects is same as before but opposite direction, no matter the masses.
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Inelastic Collisions
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total momentum is conserved, but total kinetic energy is not.
K1i+K2i=K1+K2+Klost m1V1i+m2V2i=(m1+m2)V |
