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Chapter 7 - On the move (7.1 - Speed and velocity (Speed (Displacement is…
Chapter 7 - On the move
7.1 - Speed and velocity
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Motion at constant speed
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For an object moving at constant speed on a circle of radius r, its speed, v = 2pir/T
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Velocity
When an object is moving at a constant velocity its moves at the same speed without changing its direction of motion, if an object changes its direction of motion, speed or both then its velocity changes.
7.2 - Acceleration
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Non-uniform acceleration
Non-uniform acceleration is where the direction of motion of an object changes, or its speed changes, at a varying rate. Acceleration = gradient of the line on the velocity - time graph
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7.7 - Projectile motion
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Vertical projection
When an object has no horizontal motion, its acceleration is 9.8ms.-2 downwards and its displacement, y and its velocity, v can be given in the following equations
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Horizontal projection
When two things are projected horizontally it does not matter how high the horizontal velocity of both objects are they will still both touch the ground at the same time as their vertical components are the same
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