Questions and Answers
What does 107,00 kilometers per hour represent?
Who is credited with being the first to measure speed?
Galileo
How is speed defined?
Distance covered per unit of time
What is the speed equation?
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What does the slash symbol (/) mean?
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What is instantaneous speed?
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What is the average speed equation?
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What is the total distance covered equation?
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What is velocity?
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What is a vector quantity?
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What does constant speed mean?
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What does constant velocity mean?
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What is acceleration?
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What is the acceleration equation?
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What is the key idea that defines acceleration?
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What is deceleration?
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What happens when we accelerate due to a changing direction?
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Speed and velocity are commonly used interchangeably.
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What is the acceleration equation along a straight line?
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Who developed the concept of acceleration?
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What is the velocity acquired equation?
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What is instantaneous speed or velocity at any time?
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All objects can fall with the same unchanging acceleration with no air resistance.
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What is free fall?
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What occurs during each second of free fall?
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What is the equation for velocity acquired in free fall from rest?
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Instantaneous speed is zero at the highest point of a trajectory.
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The object slows as it rises during upward motion.
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What indicates downward velocities?
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What is the equation for distance traveled?
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What is unequal acceleration?
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What does air resistance affect?
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How is speed or velocity specified when falling?
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What is acceleration defined as?
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What height is considered exceptional when jumping?
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What happens when one is airborne?
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What remains constant when a jumper is airborne?
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Study Notes
Speed and Velocity
- Speed is defined as the distance covered per unit time, representing how fast an object moves.
- Velocity combines speed with direction; to fully describe an object’s motion, both aspects are needed.
- Instantaneous speed refers to the speed of an object at any specific moment.
- Average speed can be calculated with the formula: total distance covered divided by the time interval.
- The velocity acquired during free fall is determined by the acceleration multiplied by the time in motion.
Acceleration Concepts
- Acceleration denotes how quickly velocity changes, including both speed and direction changes.
- The formula for acceleration is change in velocity divided by time interval.
- A negative sign in velocity indicates downward motion, relevant for objects in free fall.
- Deceleration refers to a significant reduction in an object’s speed over time.
- Galileo's experiments on inclined planes contributed to the understanding of acceleration, observing greater accelerations on steeper inclines.
Free Fall Dynamics
- An object is in free fall when it is influenced solely by gravity, free from air resistance or other forces.
- During free fall, an object accelerates at approximately 10 meters per second, gaining this speed each second.
- The equation for distance traveled in free fall is half of the product of acceleration and the square of time.
- Instantaneous speed is zero at the highest point of a projectile's path, where its motion direction changes from upward to downward.
Motion and Forces
- Constant speed indicates steady motion without acceleration, while constant velocity indicates a straight-line motion at an unchanging speed.
- Air resistance affects falling objects, causing unequal acceleration; lighter objects, like feathers, experience a notable reduction in speed due to this force.
- Jump height above 0.6 meters is considered exceptional for human capability.
- When airborne, a jumper maintains horizontal speed while vertical speed experiences acceleration due to gravity, indicating motion dynamics during a jump.
Mathematical Definitions
- The speed equation is formulated as distance divided by time.
- The total distance covered during motion can be calculated as average speed multiplied by time.
- The change in velocity during acceleration is a critical factor influencing motion dynamics.
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Test your knowledge of key concepts from Physics Chapter 3 with these flashcards. Each card focuses on critical terms and definitions related to motion and speed. Ideal for students looking to reinforce their understanding of fundamental physics principles.
