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44 Cards in this Set
- Front
- Back
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_____ = no acceleration
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Equilibrium
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____ = no change in translational or rotational velocity
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No acceleration
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Any system with ____ velocity is in equilibrium, even a system with constant 0 velocity
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constant
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Draw all the force vectors on the diagram and use the equations:
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The sum of the forces upward equal the sum of the forces downward
The sum of the forces to the left equal the sum of the forces to the right |
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With this method everything is positive even ____.
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gravity
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_____ = acceleration
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Non equilibrium
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Non equilibrium
Pretend it is in equilibrium then . |
The sum of the forces upward equal the sum of the forces downward
The sum of the forces to the left equal the sum of the forces to the right Now you add ma to the weaker side |
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Mass pulling on a rope and the rope is losing tension
Gravity pulls the mass downward and tension pulls upward, pretend it is in equilibrium |
Set upward forces to downward forces which gives us tension = mg
We then add MA to the weaker side, so we add it to the tension side: Tension + MA = mg |
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____ - rotational quantity, vector, equal to the product of a displacement vector a force vector and the sine of the angle between these two vectors
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Torque
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____ - rotational force pushing clockwise or counterclockwise, has units of NM
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Torque
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____ - is from the point of rotation to the point where the force line is 90 degrees to the ____
Torque equals the force times the ____. |
Lever arm
lever arm lever arm |
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Equilibirum addition - the torques ____ equal the torques ____.
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clockwise
counterclockwise |
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Two types of energy:
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mechanical and internal energy
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Mechanical is further divided into:
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kinetic and potential energy
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Kinetic energy,
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k= 1/2 mv^2
M is mass V is velocity |
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____ - an "undefined" term, such as a point or line is so small does not exist.
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energy
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Units of energy are ____ or ____
Energy is a ____. (this leads to easy ways to solve physics problems) |
joules
electron-volts scalar |
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An electron volt is ____ joules.
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1.6 x 10 ^-19 joules
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Torque problem -
Massless meterstick with masses on each end, mass on the left is 2 kg and the right is 6 kg, |
the torques clockwise equal the torques counterclockwise the center of gravity is 3/4 of the way …
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Torque problem-
If the stick is not ____, count the ____ at the center and include that in the calculations. |
massless
mass |
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Several types of potential energy:
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Gravitational
Elastic Electrostatic |
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Gravitational potential energy near the surface of the earth equals ____
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mgh
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Elastic potential energy -> ____
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1/2kΔx^2
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____ is the energy of hookes law
Hookes law -> ____ |
Elastic potential energy
f= -kΔx |
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3 kinds of systems
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Isolated
Closed Open |
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____ = no transfer of energy or mass
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Isolated
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____ = only transfer of energy
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Closed
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____ = transfer of energy and mass
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Open
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1st law of thermo -
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energy is conserved in an isolated system
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Note that the only way to transfer energy is ____.
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work or heat.
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For a closed system - the change in energy equals the work done on the system plus the heat flow into the system that is ____.
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Δe = w + q
E is energy W is work Q is heat |
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Work is the transfer of energy via a ____.
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force
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Heat is the natural transfer of energy from a ___ body to a ___ body.
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hot
cold |
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Work is a ____ it is measured in ____.
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scalar
joules |
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Power is the rate of energy transfer over time
____ Or ____, component of the force in the directional of the velocity times the velocity |
P = ΔE / t
P = FV |
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____ times the distance equals the change in mechanical energy.
The total energy change is the ____ plus the ____ which is the work. |
frictional force
mechanical energy internal energy |
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Conservative forces conserve ____
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mechanical energy
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Mechanical energy is all energy that is ____
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not internal
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Conservative forces always have a ____ associated with them
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potential energy
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Gravitational potential energy, therefore gravity is a ____
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conservative force
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____ are distance dependent
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Conservative forces
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Hookes law (elastic potential energy) is a ____.
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conservative force
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W = ____, with no heat or friction
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Δk + Δu
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With no heat first law of thermo is now ____, if there is no heat the entire energy transfer must be ____.
The possible energy transfers are the ____ and then the ____. |
Δe = w
work mechanical energies (kinetic and potential) internal energy |
