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PHY unit 2
zPHY unit 2
| Question | Answer |
|---|---|
| MKS system | meter-kilogram-second, foundation of SI (international system of units) |
| MKS unit for mass | kilogram (kg) |
| MKS unit for time | second (s) |
| MKS unit for length | meter (m) |
| distance | length of a path between two points (m-meters) |
| displacement | change in position (m-meters) |
| speed | rate of change of distance, distance over time (m/s) |
| velocity | rate of change of position (m/s) |
| acceleration | rate of change of velocity (m/s^2) |
| force | a push or pull, the product of mass and acceleration (F=ma) |
| work/energy | product of force and distance (W=FxS) -(Joule N m =kg ms^2/s^2 |
| power | rate at which work is expended/done (joule/sec = WATT) |
| intensity | power per unit area (the rate of power divided by the area over which this occurs) (watts/m^2) |
| pressure | force per unit area (pascal = N/m^2) |
| friction | energy that goes into overcoming the forces of friction is converted to heat |
| energy | the ability or capacity of an object to do work |
| potential energy | energy of an object due to its position |
| kinetic energy | energy of motion |
| period (T) | the length of time to complete one full cycle of movement -measured in seconds |
| frequency (f) | number of complete cycles of oscillation per second -measured in Hz f=1/T |
| scalar quantity + examples | only magnitude is stated. -distance -area -volume -mass -density |
| vector quantity + examples | magnitude and direction are stated -displacement -velocity -acceleration -force -intensity |
| Newtons 1st law of motion | an object will remain at rest or in a state of uniform motion unless there is an unbalanced force acting on it |
| Newtons 2nd law of motion | an unbalanced force acting on an object will cause the object to move with an acceleration proportional to the force and inversely proportional to the mass of the object |
| conservative energy | energy is conserved and available for doing work |
| harmonic motion | oscillation in a repetitive manner over time |
| interchange between kinetic and potential energy during a cycle of vibration | |
| what happens to energy that is dissipated via friction? is energy conserved | |
| F=ma | force = mass x acceleration |
| p= F/A | pressure = force/area |
| I= P/A | intensity= power/area |
| T= 1/f / f= 1/T | period / frequency |
| area of square and rectangle | |
| volume of cube or rectangular solid | |
| circumference and area of a circle | |
| surface area and volume of a sphere | |
| be able to solve problems like the ones in the homeworks | look on BS |
| characteristics of friction between objects | does NOT depend on velocity |
| characteristics of drag due to motion in fluids (air/liquid) | amount of energy lost depends on velocity of an object and its area of contact with the medium. |
Created by:
liz gelles