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Chapter 2
DHS PS Ch. 2 - Motion (2015)
| Question | Answer |
|---|---|
| When an object changes its position relative to a reference point it is called? | Motion |
| How far an object has moved from its original position is know as? | Distance |
| The distance an object travels per unit of time is called? | Speed |
| Any change over time is known as? | Rate |
| What is the formula used to solve for speed? | s = d / t |
| Speed that does NOT change over time is? | Constant speed |
| Speed is usually not constant; usually an object has what kind of speed? | Changing speed |
| Speed of motion when speed is changing is called? | Average speed |
| The formula for finding average speed is? | Avg. Speed = total distance/total time |
| The direction and speed of an object is described by its? | velocity |
| This is the distance an object travels per unit of time: | speed |
| The distance between an object and a reference point is the object's? | position |
| The SI unit of distance is the? | meter |
| The distance between the final position and the starting position and the direction is the? | displacement |
| If you leave your house at 9:00 am to walk to your grandma's house 4 km away, and on your way you stop at Speedway for 15 minutes and arrive at your grandma's at 9:30 am, what was your average speed for the trip to your grandma's house? | speed = distance/time 4km/.5h = 8km/h |
| If the acceleration is in the opposite direction as the velocity, the speed of the object will do what? | decrease |
| Describe the motion of an object that has an acceleration of 0 m/s²? | constant motion or no change in motion |
| What is the change in velocity divided by the time needed for the change to happen? | acceleration |
| If the line on a speed-time graph slopes downward to the right, then acceleration is? | negative |
| If a motorcycle is accelerating so that its speed is increasing what does the plotted line on a speed-time graph look like? | it slopes upward to the right |
| If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase |
| The horses on a carousel are moving at a constant speed but accelerate because? | the direction of the horses' motion is constantly changing |
| This happens when an object's velocity decreases? | negative acceleration |
| The name for the slant of a line on a graph? | slope |
| Speed and direction is known as? | velocity |
| The rate of change of position at a specific point in time is known as? | instantaneous speed |
| If you ride a motorcycle down a straight road for 700 m then turn around and ride back to your starting position, your distance is _____ your displacement. | greater than |
| The speed you read on a speedometer is called? | instantaneous speed |
| 15 m/s west is an example of? | velocity |
| The relationship among speed, distance, and time is? | s=d/t |
| A single point on a distance - time graph tells the? | instantaneous speed |
| A merry-go-round horse moves at a constant speed but at a changing? | velocity |
| On a speed-time graph, a line with a negative slope shows that the object is? | slowing down |
| When the motion of an object is shown by a straight line on a distance vs time graph with distance on the y-axis, the slope of the line is the? | speed |
| Displacement must always show? | direction |
| Tommy runs in a constant direction on a straight road. The velocity vs. time graph of Tommy's motion shows a straight line with a negative slope. What does the line tell you about Tommy's speed? | it is decreasing |
| When velocity changes by the same amount over each time interval, acceleration is? | constant |
| On a distance vs. time graph, the line of an object at rest is a? | flat line with a slope of zero |
| The difference between speed and velocity is that velocity includes? | direction |
| Acceleration is defined as the change in velocity divided by? | time |
| On a speed vs. time graph, constant acceleration is represented by a? | straight line |
| If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase |
| On a bus traveling 10 m/s South,a man stands up and walks toward the back of the bus at 1 m/s. What is the man's resultant velocity? | 9 m/s South (He is still traveling South with the bus but is walking in the opposite direction of the bus.) |
| Momentum is equal to _______ times _______ . | mass, velocity |
| Speed is measured in _____ . | m/s |
| Distance is measured in ____ . | meters |
| Time is measured in _____ . | seconds |
| Momentum is measured in _____ . | kg x m/s |
| Acceleration is measured in ______ . | m/s2 |
| Momentum is represented by a ___ . | p |
| Mass is represented by a ___ . | m |
| Velocity is represented by a ___ . | v |
| Time is represented by a ___ l | t |
Created by:
basmith
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