SWABT define and calculate Speed and Velocity.

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Presentation transcript:

SWABT define and calculate Speed and Velocity. OBJECTIVES SWABT define and calculate Speed and Velocity.

Vocabulary Speed Velocity Instantaneous Speed Instantaneous Velocity

Speed Speed is a measure of how fast something moves. SI unit: m/s other: miles/h , km/h (for long distances) Speed is a scalar quantity Speed is always positive.

Average speed

Velocity Velocity is change in displacement at a given time and in given direction. Velocity is a vector quantity Velocity --------Magnitude (SPEED) + Direction Unit of Velocity ----- m/s, miles/h, km/h Velocity is positive for positive displacement ( moving to right, east or + ve direction) Velocity is negative for negative displacement (moving to left, west or - ve direction)

Average velocity

Velocity and Speed Train engineers use speed only. speed = 90 km/h Pilots use velocity (direction & speed). speed = 300 km/h direction = west

Instantaneous velocity The velocity at any instant is called instantaneous velocity.

An object’s speed at any given instant is Instantaneous speed. Speedometer tells the car’s speed at any instant.

Khan Academy https://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-velocity-and-speed/e/average-velocity---speed-multi-motion--no-graph-