Defining Motion

• žMotion is defined as a change in position over a period of time

• žFor each situation, a frame of reference must be in place.

• žGenerally, the starting position and time are set as the origin

  • Position = 0 meters

  • Time = 0 seconds

Unit 1a: Velocity

​Imagine that the images are super-imposed on each other to show the change in position – or, motion!

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Defining Motion

• Displacement measures your change in position.

• A vector quantity is a magnitude AND a direction.

• Directions can be N-S-E-W or +/-

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• A scalar quantity is just a number value or measurement (magnitude)

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Distance is a scalar quantity

Distance vs. Displacement

Unit 1a: Velocity

Displacement is a vector quantity

• ​You can have a negative displacement.

• A negative displacement indicates backwards or downwards motion.

• ​You cannot travel a negative distance!

Distance is a scalar quantity

Distance vs. Displacement

Unit 1a: Velocity

Displacement is a vector quantity

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Velocity

•Speed is a scalar quantity – it has magnitude only

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Speed

Velocity vs. Speed

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