| A | B |
|---|
| What is Acceleration? | Acceleration is a word that implies speeding up. |
| What can acceleration also mean? | However, acceleration can mean: 1. To speed up 2. To slow down 3. To change directions |
| Define Acceleration | How much your velocity (speed) changes in time. |
| How do you know when there is positive acceleration? | Speed increases in time means positive acceleration. |
| How do you know when there is negative acceleration? | Speed decreases in time means negative acceleration. |
| How do you know when there is constant speed? | If the speed is constant or “on cruise control”, the acceleration is 0 m/s2 because the car is neither speeding up or slowing down. |
| What type of graph shows acceleration most clearly? | The position vs. time graph shows acceleration most clearly. |
| How do you know, in graphs, when there is acceleration? | Graphs have curves when there is acceleration. |
| How do you find average acceleration? | Average acceleration, ā, is calculated by dividing the change in speed by the a time interval. |
| What is the formula for average acceleration? | ā = Δv/Δt |
| What are the two measurements that one needs when finding the average acceleration? | 1. The changing speed from one moment to another. 2. The change in time. |
| What does the symbol "Δ" mean? | The symbol “Δ” means changing |
| What does "Δ" represent? | The change in velocity, Δv, represents the difference between the final speed of the object and the initial or starting speed of the object. |
| How do we write "Δ" formally? | We write it as: Δv = v final – v initial. |
| How do we calculate acceleration? | To calculate acceleration simply divide the two differences. |
| What is the unit for acceleration? | m/s^2 |
| How do we know when an object is in free-fall? | An object is in free fall if it is accelerating due to the force of gravity and moving up or down |
| Does free-fall mean to go down? | No, free-fall does not mean to go down. Gravity does not care which way you are moving |
| Define Gravity. | Force exerted by the Earth on all objects. |
| How fast does gravity pull us? | Gravity pulls all objects with the same acceleration force of 9.8 m/s^2 or how fast your speed changes as you fall. |
| Do falling objects increase their speed by 9.8 m/s every second? | Yes, falling objects increase their speed by 9.8 m/s every second. |
| How fast is free-fall? | 9.8 m/s = 22 miles per hour. |
| How fast does you speed increase when you are in free-fall? | Your speed increases about 22 miles per hour for every second that you fall. |
| When does acceleration occur? | Acceleration occurs whenever there is a change in speed, direction, or both.Acceleration occurs whenever there is a change in speed, direction, or both. |
| What is a projectile? | A projectile is an object moving under the influence of only gravity. |
| What is a parabola? | A bowl-shaped curve that projectiles influence. |
| What does a object in circular motion have? | An object in circular motion has a velocity vector that constantly changes direction. |
| When one lets go of an object in circular motion in what shape does it go? | It goes in a straight line. |
