Conceptual Physics 10th Ed. Ch 3.
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26 terms
Terms | Definitions |
|---|---|
 Speed = distance/time km/s | Formula for Speed |
| Average speed = total distance covered/time interval (320 km/4h = 80 km) | Formula for Average speed |
| 20 km/h = 6 m/s | 12 mi/h = ? km/h =? m/s |
| Velocity | The speed of an object and the specification of its direction. |
| vector force | Velocity is also considered a |
| Constant Velocity | Constant speed with constant direction is called |
| acceleration | How quickly velocity changes is called |
| Acceleration = change in velocity/time interval | Formula for acceleration |
| Velocity acquired = acceleration x time | Formula for velocity acquired |
| Freefall | motion under the influence of gravity alone |
| gravity | 10 m/s squared |
| v = g x t (g = 10) | formula for velocity of a falling object is |
| d = 1/2 gt^2 | formula for distance of falling objects is |
| d = (Vi + Vf/2) x t | if object is thrown, formula for distance is |
| t = (square root of 2d/a) a=g=10m/s^2 | Formula for for hang time |
| Vector quantity | Quantity in physics that has both magnitude and direction |
| The horses speed is 30 km/h (formula is d = 15 speed/time (0.5) | What is the average speed in kilometers per hour for a horse that gallops a distance of 15 km in a time of 30 min? |
| Yes the car moves at a constant speed. | If a car moves at constant velocity, does it also move at a constant speed? |
| Yes it maintains constant speed, but no it does not maintain a constant velocity because a constant velocity is both constant speed and constant direction. | If a car is moving at 90 km/h and it rounds a corner, also at 90 km/h, does it maintain a constant speed? A constant velocity? Defend your answer? |
| 10 km/h/s | What is the acceleration of a car that increases its velocity from 0 to 100 km/h in 10 s? |
| The acceleration is 0 because the car maintains constant velocity. | What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? |
| the gain is g which is 10m/s^2 | What is the gain in speed per second for a freely falling object? |
| v = gt velocity is 50m/s, 60 m/s | What is the velocity acquired by a freely falling object 5s after it is dropped from a rest position? What is it 6 s after? |
| the object loses g, 10m/s | When an object is thrown upward, how much speed does it lose each seconf? |
| d = 1/2gt^2, After 1 second 5m, after 4 s 80m | What is the distance fallen for a freely falling object 1 s after being dropped from a rest position? What is it 4 s after? |
| An example is a car slowing down. | Can you cite an example in which the acceleration of a body is opposite in direction to its velocity? if so, what is your example? |
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