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physical-science
Test notes
| Question | Answer |
|---|---|
| What is the difference between distance and displacement? | Distance is the sumtotal of all the points, but displacement is a straight line from beginning to end |
| Explain what a vector is and give examples of it. | A vector is a quantity that has both magnitude and direction. Examples: displacement direction velocity acceleration momentum force lift drag thrust weight etc. |
| Explain what a scalar is and give examples of it. | A scalar just shows magnitude. examples:length area volume speed pressure temerature energy work power etc. |
| What is 1D kinematics | things moving in the x direction |
| what is 2D kinematics | motion in the y direction |
| what are the ways to see kinematics | diagrams graphs words and mathematically |
| what is position | where you are located. variable is x |
| what is distance | how far youve traveled regardless of direction |
| on a position v.s. time graph what component do you associate time and distance with | distance with y. time with x. |
| weight= | mass*gravity |
| What is SOH | sin of theta=opposite/hypotenuse |
| What is CAH | cos of theta=adjacent/hypotenuse |
| what is TOA | tan of theta=opposite/adjacent |
| you watch a diver and time the time it takes her to hit the water's surface. Your stopwatch indicates that the diver took 3.5 seconds to hit the water. What was her velocity? What is the hit from which she dived? | velocity=34.3 meters per second height=60 meters |
| What is newton's first law of motion? | The law of inertia. Unless an unbalanced force is applied to it, a moving object will stay in motion and an object at rest will not move. |
| What is a force? | A force is not a thing it is a concept. It acts on an object to cause it to change in some way |
| What is newton's second law? | An object's acceleration depends on its mass and the force affecting it F=MA or any variation of it A=F/M |
| What is newton's third law? | M1V1=M2V2 p=mv For every action there is an equal and opposite reaction |
| what is terminal velocity | the constant velocity of a falling object when the force of air resistance equals the force of gravity |
| what is air resistance | fluid friction acting on an object movin through the air |
| Explain a proportional relationship | if one variable goes up so does the other |
| explain an inversely proportional relationship | if one goes up the other goes down |
| what component does sin work with | the y component |
| what component does cos work with | the x component |
| a fan hangs from a rafter by two wires. The fan is 100N and the angle of the wires is 40degrees. Each wire is called a tension (tension 1 and 2). Solve for the tension. | T=78N |
| define momentum | mass and the velocity of the mass |
| define impulse | the product force acting on an object and the time during which the force acts |
| What is the SI unit for momentum | kg*m/s |
| what's the SI unit for impulse | N*s |
Created by:
ashbash
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