| A | B |
|---|
| Acceleration is | the rate of change of velocity |
| What does the graph above illustrate about acceleration? | The acceleration is constant. |
| Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? (Disregard air resistance. g=9.81 m/s².) | at least 19.6 |
| Objects that are falling toward Earth move | faster and faster |
| Identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration. | scalar, scalar, vector |
| A cave explorer travels 3.0 m eastward, then 2.5 m northward, and finally 15 m westward. Use the graphical method to find the magnitude of the net displacement. | 12 m |
| A student adds two vectors with magnitudes of 200 and 40. Takling into account significant figures, which is the only possible choice for the magnitude of the resultant? | 200 |
| A car travels down a road at a certain velocity, Vcar. The driver slows down so that the car is traveling only half as fast as before. Which of the following is the correct expression for the resulting velocity? | ½ Vcar |
| Which of the following is the best coordinate system to analyze a car traveling northeast from one city to another? | positive x-axis pointing east; positive y-axis pointing north |
| Which of the following is the best coordinate system to analyze an object thrown into the air? | x-axis: parallel tothe ground; y-axis: perpindicular to the ground |
| Which of the following is the best coordinate system to analyze the movement of a submarine diving at an angle of 45º to the surface of the water? | x-axis: horizontal at the water level; y-axis: up and down |
| Which of the following is the motion of objects moving in two dimensions under the influence of gravity? | projectile motion |
