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chapter 11 Motion
motion
| Question | Answer |
|---|---|
| 14 km represents what? | distance |
| 30 m/s represents what? | speed |
| 34 min represents what? | time |
| 3 m SW represents what? | displacement |
| 12 m/s2 NORTH represents what? | acceleration |
| 150 mph NW represents what? | velocity |
| 6 m/s2 represents what? | acceleration |
| The study of energy and what it does to matter | physics |
| The study of motion | mechanics |
| A system of objects that are not moving with respect to one another. This needs to be established to accurately describe the motion of something. | frame of reference |
| Movement in relation to a frame of reference | relative motion |
| How far something has moved, or the exact length/path between 2 points | distance |
| Distance and direction of something from its starting point | displacement |
| A quantity that has size or magnitude only | scalar |
| A quantity that has both size/magnitude and direction | vector |
| A student walks 5 m N, 5 m E, and 10 m S. What is her distance? | 20 m |
| A student walks 5 m N, 5 m E, and 10 m S. What is her displacement? | 7 m SE (square root of 50 using Pythagorean theorem - a=5 and b=5)) |
| A student runs the 800 m in track, which is 2 full laps around the track. What is their distance and displacement? | distance = 800 m displacement = 0 m (finish back where started) |
| The distance something travels in a certain amount of time | speed |
| The distance and direction something travels in a certain amount of time | velocity |
| Speed that doesn't change over time | constant speed |
| The total distance traveled / total time for a trip. | average speed |
| The speed at any given point in time | instantaneous speed |
| Change in speed, direction, or both | acceleration |
| What are some vector quantities? | displacement, velocity, and acceleration |
| what are some scalar quantities? | distance, speed |
| If a distance runner covers 1600 m in 280 s, what is his speed? | 5.7 m/s |
| Florence Griffith-Joyner set the women's world record in the 200 m in 1988. She ran it in 21.34 s and still holds the world record today. What is her speed? | 9.3 m/s |
| The max speed on many highways is 121 km/h. What distance can you travel at that speed if you went for 2 hours continuously? | 242 km |
| The average tree sloth moves at a top speed of 0.743 m/s. How long would it take a sloth to "sprint" across our classroom (roughly 13 m)? | 17.5 s |
| What is negative acceleration? | deceleration |
| In 1970 the world record was set for drag racing. The car went from 0 to 110 m/s in 6.5 s. What was the acceleration? | 16.9 m/s2 |
| A fighter jet landing on an aircraft carrier must reduce its speed from 42.5 m/s to 0 m/sin 2 seconds. What is the acceleration? | - 21.3 m/s2 (deceleration!) |
| What does constant speed look like on a d vs t graph? | straight line angling up the steeper the angle, the faster the speed |
| What does constant speed look like on a s vs t graph? | straight line across horizontal |
| What does acceleration look like on a d vs t graph? | line curving up or curving down |
| What does acceleration look like on a s vs t graph? | line or curve up or down |
| What does zero speed look line on a d vs t graph? | straight line going across horizontal axis (right on the x axis) |
| If you calculate slope of a d vs t graph, what are you finding? | speed (slope = rise (y value difference which is distance)/run (x value difference which is time)) |
| If you calculate slope of a s vs t graph, what are you finding? | acceleration speed (slope = rise (y value difference which is speed)/run (x value difference which is time)) |
| What is G force? | a measure of the force felt on your body standing still at the surface of the earth |
| What causes + G forces? | rapid acceleration which pushes down on your body |
| What causes - G forces? | rapid declaration which pushes up on your body |
| What causes blackout on a roller coaster | too many + G forces |
| What is the problem with experiencing too many - G forces | redout - blood vessels in brain bursting |
| What is the term for adding two vectors like velocity | resultant vector |
| If a plane is flying at 500 km/h S and the wind is blowing at 65 km/h W, what is the resultant velocity? | 504 km/h SW (Square root of 500 squared + 65 squared) |
| All measurements in science must have a ___ and a _____. | number and a unit of measure |
| All measurements in science are made to the right number of significant digits which includes all the lines you know for sure plus one _____ between the lines | guess |
| convert 5 m to km | .005 km |
| convert 5 km to m | 5000 m |
| convert 4 cm to mm | 40 mm |
Created by:
tbrandt
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