Mechanics: Kinematics

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What is the definition of velocity?
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Velocity is the speed of an object in a given direction.
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Differentiate between speed and velocity.
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Speed is a scalar quantity indicating how fast an object is moving, while velocity is a vector quantity indicating speed and direction.
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What is displacement?
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Displacement is the change in position of an object, measured as a vector from the initial to the final position.
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How do you calculate average velocity?
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Average velocity is calculated by dividing the total displacement by the total time taken.
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What is acceleration?
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Acceleration is the rate of change of velocity of an object over time.
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Give the equation of motion for uniformly accelerated motion.
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The equation is v = u + at, where v is final velocity, u is initial velocity, a is acceleration, and t is time.
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What is the significance of the slope in a velocity-time graph?
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The slope of a velocity-time graph represents acceleration.
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What does the area under a velocity-time graph represent?
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The area under a velocity-time graph represents displacement.
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What is the difference between instantaneous velocity and average velocity?
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Instantaneous velocity is the velocity at a specific moment, while average velocity is calculated over a time interval.
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Define free fall.
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Free fall is the motion of an object subject only to gravitational force, neglecting air resistance.
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What is the numerical value of acceleration due to gravity on Earth?
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The acceleration due to gravity on Earth is approximately 9.81 m/sĀ².
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How does air resistance affect the motion of a falling object?
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Air resistance opposes the motion, reducing acceleration and terminal velocity.
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How is instantaneous speed calculated from a distance-time graph?
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Instantaneous speed is calculated by determining the slope of the tangent to the curve at a given point on a distance-time graph.
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Explain projectile motion.
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Projectile motion is the curved path an object follows when thrown or propelled near the Earth's surface, influenced by gravity and initial velocity.
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What is uniform motion?
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Uniform motion refers to motion at a constant speed in a straight line, where the acceleration is zero.
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