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Physics 1-2
| Question | Answer |
|---|---|
| Quadratic Equation | (-b +- (root(b^2 - 4ac))) / 2a |
| Addition of Vectors (Same Direction) | Use the Tip to Tail method where you place the tail at the same position as the tail of the other vector. The result of two vectors that point in the same direction is the sum of the magnitudes. |
| Addition of Vectors (Opposite Direction) | Have a magnitude equal to the difference in the magnitudes of the original vectors and its direction will be the same as the vector with the greater magnitude. |
| Addition of Vectors (At An Angle) | If the vectors are at an angle to each other other than 0 or 180, special methods must be used. You can still use the Tip to Tail if you move the vectors parallel to their original direction until one vector tail is at the tip of another. |
| Analytical / Components Method | You would have to break down each vector into its horizontal (x) and vertical (y) components, sum the corresponding x components, sum the corresponding y components, then use Pythag to find the magnitude. |
| Steps of the Component Method | You have to find the x and y components first, which sometimes can be done by taking the cos or sin (make sure these are in degrees). Then add and use Pythag. To find the degree, you can use a set up like tan-1 (Ay/Ax). |
| East | Right |
| West | Left |
| North | Up |
| South | Down |
| Displacement | Vector that points from an object's initial position towards its final position and has a magnitude that equals the shortest distance between the two positions. |
| Speed | Distance / Elapsed time |
| Instantaneous Speed | The speed of a particular object at a point in time |
| Velocity | Displacement / Elapsed Time |
| Instantaneous Velocity | How fast an object moves and the direction of motion each time. |
| Acceleration | change in velocity / elapsed time |
| Significant Figure Rules | 1) the zeroes at the beginning of a number are NOT sig 2) zeroes at the end of a number left of the decimal point are NOT sig 3) zeroes at the end of a number right of a decimal point ARE sig 4) zeroes in between significant figures are sig |
| Significant Figure Rules Continued | 5) in multi/division, the answer is rounded to the same number of sig figs as the term with the fewest sig figs 6) in addition subtraction, the number is rounded to the same decimal place as the most precise decimal place in the least precise term |
| Freefall | One application of uniformly accelerated motion is object in free fall. The rate of acceleration (g) of all objects in free fall is 9.8 m/s^2. |
| Perform #1 on the Homework | -- |
| Perform #2 on the Homework | -- |
| Perform #3 on the Homework | -- |
| Perform #4 on the Homework | -- |
| Problem #5 on the Homework | -- |
| Problem #6 on the Homework | -- |
| Problem #7 on the Homework | -- |
| Problem #8 on the Homework | -- |
| Problem #9 on the Homework | -- |
| Problem #10 on the Homework | -- |
| Lecture Problem #1 | -- |
| Recitation Problem #1 | -- |
| Recitation Problem #2 | -- |
| Recitation Problem #3 | -- |
| Recitation Problem #4 | -- |
| Another way to get the Vavg equation | (Vi + Vf)/2 |
| How does a position (displacement) vs time graph look when an object is stationary? Remember that displacement is NOT distance! | A horizontal straight line (through it wouldn't be resting on the x-axis) |
| How does a position (displacement) vs time graph look when an object is showing uniform motion? | It is linearly increasing |
| How does a position (displacement) vs time graph look when an object is showing constant acceleration? | It is increasing with a slope |
| How does a velocity vs time graph look when an object is stationary? | A horizontal straight line resting on the x-axis (because the velocity is zero). |
| How does a velocity vs time graph look when an object is showing uniform motion? | A horizontal straight line (through it wouldn't be resting on the x-axis) |
| How does a velocity vs time graph look when an object is showing constant acceleration? | It is linearly increasing |
| How does a acceleration vs time graph look when an object is stationary? | A horizontal straight line resting on the x-axis (because the acceleration is zero). |
| How does a acceleration vs time graph look when an object is showing uniform motion? | A horizontal straight line resting on the x-axis (because the acceleration is zero). |
| How does a acceleration vs time graph look when an object is showing constant acceleration? | A horizontal straight line (through it wouldn't be resting on the x-axis) |
| In three scenarios: a ball with an initial velocity of Vo, a ball with a pos initial velocity that is thrown straight up, a ball with a neg initial velocity that is thrown straight down -- which of the following represents free fall? | All three scenarios represent free fall — as long as air resistance is neglected and the ball has already been released. Free fall is defined as motion in which the only force acting on an object is gravity. |
Created by:
smurtab