Questions and Answers
What is motion?
Change in position
What is a reference point?
A place or object used for comparison to determine if an object is in motion
What is distance?
How far an object moves
What is the International System of Units?
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In the scenario where Jane is sitting in her family car, which of the following is not moving with respect to Jane?
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Why is it difficult to use a moving car as a reference point?
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What is the best reference point for describing the motion of the planets in our solar system?
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What is the best reference point for Jeff in a stationary school bus to determine when the bus starts to move?
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What is the SI unit for measuring distance?
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There are 1,000 __________ in a meter.
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There are 1,000 meters in a____________________________.
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An object is ________________________if its position changes relative to another object.
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A______________________is a place or object used for comparison to determine if something is in motion.
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________________________________is the length of the path between two points.
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What is speed?
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What is average speed?
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What is slope?
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What is velocity?
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What is instantaneous speed?
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On a distance-versus-time graph, a speed of zero would appear as a horizontal line.
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The SI unit for speed is m/min.
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A distance-versus-time graph will never show a horizontal line.
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The slope of a line is found by multiplying the rise by the run.
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On a distance-versus-time graph, a straight line indicates that an object's speed is zero.
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Speed in a given direction is called velocity.
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A speedometer shows the______________________speed of a vehicle.
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To describe an object's motion, you need to know both its speed and its__________________________.
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The_________________speed of an object is found by dividing the total distance by the total time.
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Alfonso ran the 1,000-meter race in 2.5 minutes. Alfonso's average speed was_______m/min.
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If a train is slowing down, it is accelerating.
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To find the acceleration of an object moving in a straight line, you must calculate the change in distance for each unit of time.
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A Ferris wheel turning at a constant speed of 5 m/s is not accelerating.
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An airplane is flying west at 200 km/h. Two hours later, it is flying west at 300 km/h. Its average acceleration is 100 km/h².
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A speed-versus-time graph for a car's motion is a horizontal line at a speed of 12 m/s. The car's acceleration during this time is 12 m/s².
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The SI units for acceleration are KM/H².
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The rate at which the velocity of an object changes is the object's rate of__________________.
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An airplane is accelerating at 8 m/s². Each second its speed increases by _____________________m/s.
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An airplane is accelerating at -8 m/s². The distance the airplane travels each second is _________________________________ the distance it traveled during the previous second.
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An amusement park ride falls straight down for 4 seconds. During this time, the ride accelerates from a speed of 0 m/s to 40 m/s. The ride's rate of acceleration during the 4 seconds is ________________________________ m/s².
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Speed equals distance divided by
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When you know both the speed and direction of an object's motion, you know the
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The steepness of a line on a graph is called the
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What is the rate at which velocity changes called?
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What is the SI unit of acceleration?
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On a graph showing distance versus time, a horizontal line represents an object that is:
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Who uses the International System of Units?
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What is an example of acceleration?
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Study Notes
Key Concepts of Motion
- Motion refers to a change in an object's position over time.
- Reference Point: An object or place used to assess whether another object is in motion, essential for understanding relative motion.
- Distance is measured as how far an object moves, typically in meters (SI unit).
- Speed quantifies how fast an object is moving, expressed as distance traveled per unit of time.
Units of Measurement
- The International System of Units (SI) is utilized globally for scientific measurements, with key units like meters for distance and meters per second (m/s) for speed.
- Millimeters to a meter: 1,000 millimeters exist in a single meter.
- A kilometer contains 1,000 meters.
Understanding Motion
- An object is classified as in motion when its position changes relative to a reference point.
- An appropriate reference point is crucial; for planet motion in the solar system, the Sun is the most suitable.
- On a distance-versus-time graph, a zero speed appears as a horizontal line, indicating no movement.
Speed and Velocity
- Average Speed is determined by total distance divided by total time.
- Velocity includes both speed and direction of a moving object, differentiating it from mere speed.
- Instantaneous Speed indicates the speed of an object at a specific moment in time.
Graphical Representations
- The steepness of a line on a graph is defined as the slope, essential for interpreting data related to speed and distance.
- A straight line on a distance-versus-time graph signifies constant speed, not zero speed.
Motion Dynamics
- An object’s acceleration is the rate at which its velocity changes, measured in m/s².
- Positive acceleration results from an increase in speed, while negative acceleration indicates a decrease.
- For example, a plane accelerating at 8 m/s² increases its speed by 8 m/s every second.
Distinct Motion Scenarios
- Items like a stationary school bus provide a stable reference point for determining movement.
- Inconsistent examples such as a Ferris wheel moving at constant speed illustrate that acceleration is related to changes in speed or direction, not just speed itself.
- An airplane’s average acceleration can be calculated by examining changes in speed over time.
Misconceptions about Motion
- Distinguish between acceleration and other terms: a speedometer indicates instantaneous speed, not velocity.
- Recognize that motion includes not only speed but also the direction of travel, essential in defining velocity.
- Understanding that a horizontal line on a distance-versus-time graph indicates no distance change, hence no motion, is vital for accurate interpretation.
Summary of Important Units
- SI units for acceleration: m/s²
- Speed unit considerations: Measurement may be mistaken if not contextualized properly regarding direction and time.
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Description
Explore the essential concepts of motion, including reference points, distance, and speed. Understand the units of measurement used in motion and the importance of relative motion in physics. This quiz will enhance your grasp of these fundamental principles.
