DHS PS Ch. 2 - Motion (2015)
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| When an object changes its position relative to a reference point it is called? | Motion
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| How far an object has moved from its original position is know as? | Distance
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| The distance an object travels per unit of time is called? | Speed
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| Any change over time is known as? | Rate
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| What is the formula used to solve for speed? | s = d / t
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| Speed that does NOT change over time is? | Constant speed
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| Speed is usually not constant; usually an object has what kind of speed? | Changing speed
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| Speed of motion when speed is changing is called? | Average speed
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| The formula for finding average speed is? | Avg. Speed = total distance/total time
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| The direction and speed of an object is described by its? | velocity
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| This is the distance an object travels per unit of time: | speed
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| The distance between an object and a reference point is the object's? | position
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| The SI unit of distance is the? | meter
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| The distance between the final position and the starting position and the direction is the? | displacement
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| 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
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| If the acceleration is in the opposite direction as the velocity, the speed of the object will do what? | decrease
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| Describe the motion of an object that has an acceleration of 0 m/s²? | constant motion or no change in motion
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| What is the change in velocity divided by the time needed for the change to happen? | acceleration
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| If the line on a speed-time graph slopes downward to the right, then acceleration is? | negative
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| 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
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| If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase
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| The horses on a carousel are moving at a constant speed but accelerate because? | the direction of the horses' motion is constantly changing
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| This happens when an object's velocity decreases? | negative acceleration
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| The name for the slant of a line on a graph? | slope
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| Speed and direction is known as? | velocity
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| The rate of change of position at a specific point in time is known as? | instantaneous speed
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| 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
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| The speed you read on a speedometer is called? | instantaneous speed
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| 15 m/s west is an example of? | velocity
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| The relationship among speed, distance, and time is? | s=d/t
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| A single point on a distance - time graph tells the? | instantaneous speed
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| A merry-go-round horse moves at a constant speed but at a changing? | velocity
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| On a speed-time graph, a line with a negative slope shows that the object is? | slowing down
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| 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
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| Displacement must always show? | direction
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| 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
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| When velocity changes by the same amount over each time interval, acceleration is? | constant
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| On a distance vs. time graph, the line of an object at rest is a? | flat line with a slope of zero
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| The difference between speed and velocity is that velocity includes? | direction
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| Acceleration is defined as the change in velocity divided by? | time
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| On a speed vs. time graph, constant acceleration is represented by a? | straight line
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| If the acceleration is in the same direction as the velocity, the speed of the object will do what? | increase
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| 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.)
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| Momentum is equal to _______ times _______ . | mass, velocity
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| Speed is measured in _____ . | m/s
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| Distance is measured in ____ . | meters
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| Time is measured in _____ . | seconds
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| Momentum is measured in _____ . | kg x m/s
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| Acceleration is measured in ______ . | m/s2
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| Momentum is represented by a ___ . | p
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| Mass is represented by a ___ . | m
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| Velocity is represented by a ___ . | v
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| Time is represented by a ___ l | t
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