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Science Test: 3/7/17
Mrs. G's Physical Science
How can you describe the motion of an object? | You must know the direction it is moving and how fast. |
True//False: A frame reference is not necessary to describe motion accurately & completely | False |
Movement in relation to a frame reference is called __________. | Relative Motion |
What is distance? | The length of a path between 2 points. |
What is the best way to measure the length of a room? | Meters |
True//False: Five blocks south is an example of displacement. | True (Displacement is movement from place or position) |
Compare/Contrast distance & displacement | Distance- length between points Displacement- direction & length from starting point to end |
What would your total displacement be if you walked from front door, around block, back to door. | 0 You come from starting point and you end there. |
A vector is a quality that has _______ and _______. | 1. Magnitude 2. Direction |
What three things can describe the magnitude of the vector? | length, amount, and size |
To combine two displacements that are in opposite directions, the magnitudes _________ from one another. | Subtract |
What is the displacement of a cyclist who travels 1 mile north, 1 mile east, and one mile south | 1 mile east |
The vector sum of two or more other vectors is called __________. | Resultant Vector |
What is speed? | Speed is the ratio of distance an object moves to the amount of time the object moves. |
What is the unit for speed? | Meters per second |
True//False: You can determine how fast you were going at the midpoint of a trip by calculating average speed for the entire trip. | False |
A student walked 1.5 km in 25 minutes and then realized he was late, so he ran the remaining .5 km in 5 minutes. What is the average speed on the way to school? Speed = Distance/Time | 4 km per min |
What type of speed does automobile's speedometer display? | Instantaneous Speed |
What does the slope of a line on a distance time graph represent? | Speed |
How do speed and velocity differ? | Velocity- both speed and direction if motion, a vector Speed- ratio of distance an object moves to the amount of time |
Examples of change in velocity are... | A moving object gains speed, changes direction, slows down |
True//False: If a car travels around a gentle curve on a highway at 60 km/h, the velocity does not change | False |
How do velocities combine? | Vector addition when two or more vectors combine |