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Questions and Answers
What kind of motion is exhibited by a moving object that is speeding up at a constant rate?
What kind of motion is exhibited by a moving object that is speeding up at a constant rate?
Accelerated motion
Which equation is the correct mathematical representation of the position versus time graph x = xi + vt?
Which equation is the correct mathematical representation of the position versus time graph x = xi + vt?
x = xi + vt
The object is at rest. This position versus time graph represents the motion of an object moving in a straight line.
The object is at rest. This position versus time graph represents the motion of an object moving in a straight line.
True (A)
The object is moving at a constant speed. This position versus time graph represents the motion of an object moving in a straight line.
The object is moving at a constant speed. This position versus time graph represents the motion of an object moving in a straight line.
Which is the best description of g, the magnitude of the acceleration due to the force of gravity?
Which is the best description of g, the magnitude of the acceleration due to the force of gravity?
After releasing a ball thrown directly downward, what is the magnitude of its acceleration?
After releasing a ball thrown directly downward, what is the magnitude of its acceleration?
When you drop a ball, it falls and increases in speed at a rate of 9.8 m/s every second.
When you drop a ball, it falls and increases in speed at a rate of 9.8 m/s every second.
Which of the following objects is considered to be in free fall?
Which of the following objects is considered to be in free fall?
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Study Notes
Kinematics Overview
- A moving object that accelerates at a constant rate exhibits linear motion, depicted in a velocity versus time graph as a straight line with a positive slope.
- The equation x = xi + vt represents the relationship between position (x), initial position (xi), velocity (v), and time (t) in uniform motion.
Analyzing Motion through Graphs
- A position versus time graph with a horizontal line indicates the object is at rest, meaning there is no change in position over time.
- A position versus time graph with a straight, upward-sloping line signifies the object moves at a constant speed, indicating uniform or consistent velocity.
Gravitational Acceleration
- The symbol g quantifies the acceleration due to gravity, with an approximate value of 9.8 m/s², which applies to objects in free fall near Earth's surface.
- Throwing a ball downward results in an acceleration of 9.8 m/s² immediately after release, as it is still influenced by gravity.
Dynamics of Falling Objects
- A dropped ball accelerates downward at a rate of 9.8 m/s², meaning it increases speed by this amount every second until it impacts the ground.
- An object in free fall, like a hammer tossed upward on the moon, experiences this acceleration regardless of initial velocity due to the lack of atmospheric resistance.
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