Topic 2.1 Kinematics Flashcards Preview

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Flashcards in Topic 2.1 Kinematics Deck (11)
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Define displacement

o Displacement: The distance travelled in a particular direction from a specified origin. A vector.


Define velocity

o Velocity: The rate of change of displacement with time. A vector. Unit: ms-1


Define speed

o Speed and Distance: The scalar versions of velocity and displacement.


Define acceleration

o Acceleration: The rate of change of velocity with time. A vector. Unit ms-2


• 2.1.2: Explain the difference between instantaneous and average values of speed, velocity and acceleration

o Instantaneous: The value of a quantity measured at an instant in time, as opposed to an average quantity measured over a period of time.


• 2.1.4: Identify the acceleration of a body falling in a vacuum near the Earth’s surface with the acceleration g or free fall

o Acceleration Due to Gravity: Ignoring air resistance, a free-falling object accelerates at the surface of the Earth at approx. 9.8ms-2 This is numerically equal to gravitational field strength.


• 2.1.6: Describe the effects of air resistance on falling objects

o Terminal Velocity: Air resistance is proportional to speed, so an accelerating object will achieve terminal velocity


Calculate and interpret the gradients of displacement-time graphs

o DISPLACEMENT-TIME GRAPHS: Gradient is velocity.


Calculate and interpret the gradients and area under the curve of velocity-time graphs

o VELOCITY-TIME GRAPHS: Gradient is acceleration. Area under graph is displacement.


Calculate and interpret the area under the curve of acceleration-time graphs

o ACCELERATION-TIME GRAPHS: Area under graph is change in velocity.


Define relative velocity

o RELATIVE VELOCITY: A velocity measured from the point of view of another moving object (eg the velocity of a car with respect to the bicycle it passes).