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20 Cards in this Set
- Front
- Back
Mass as expression of density and volume |
As expression of density and volume, mass=density *volume (ie, mass is proportional to density and inversely proporyonal to volume) |
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Mass as a function of force snd acceleration |
F=ma. In a standing object, acceleration is the gravitational constant (9.8 m/s^2), and force is considered equal to eight. Thus, weight=mass*9.8 |
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Law of conservation of mass |
The mass of a closed system must remain unchanged over time. |
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Forces in equilibrium. In standing objects |
An object remains still when the forces acting upon it are in equilibrium (eg, an object sitting in a table is motionless because the force of the gravity killing it to the floor is equal to the force of the table pushing it up) |
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Friction |
Friction is the force caused when one object is rubbed against another. It works opposite to the main force. |
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Tension |
A pulling force that is exerted by a string, cable or chain |
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Elastic force |
The force exerted by an object trying to return to its original length |
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Speed |
Speed=distance /time It is a scalar quality |
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Velocity |
Velocity =(x2-x1)/(t2-t1)(ie,displacement /time ). It is a vector quantity. |
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Acceleration |
Acceleration =change in velocity /change in time. It is a vector quantity. Also, acceleration=force/mass. |
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Equivalence principle |
All objects fall to the earth at the same speed, regardless of their mass. |
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Cause of ocean tides |
Ocean Torres are caused by the gravity of the moon pulling on the waters of the ocean. |
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Friction and heat |
When one object slides on another, it decelerates and thus loses energy. Due to the law of conservation of energy, the kinetic energy that is lost is converted to heat energy. |
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First law of motion (inertia) |
An object at rest will remain at rest, and an object in motion will remain in motion, unless an outside force works upon it. |
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Second law of motion |
The greater the mass of an object, the greater the force that is necessary to move it. Thus, force=mass*acceleration |
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Third law of motion |
For every action, there is an equal and opposite reaction |
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Function of a lever |
A lever multiplies force by allowing you to move a smaller force a longer distance (the actual object has great mass but travels a small distance (proportional to the size of the fulcrum) |
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Operation of wheel and axle |
A wheel and axle can be used both as a lever and as a method of reducing friction |
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Operation of pulley |
A pulley functions as a lever in reducing the amount of force needed, and as a method of changing the direction of a force |
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Function of incline plane |
Allows an object to be slid up instead of lifted |