In Motion: A Physics Unit I love physics, but I hate moving.

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Presentation transcript:

In Motion: A Physics Unit I love physics, but I hate moving.

 Work with both vector and scalar quantities  Describe differences of distance and displacement  Recognize interval and instant  Describe differences of speed and velocity

VelocitySpeedDisplacement PositionDistance Origin ∆ (delta) Scalar Vector InstantInterval Key Words

To describe movement you must have two things: Origin Position Origin – a reference (start) point, where we begin to take measurements from. Position – the location an object is found away from the Origin.

Distance is the total travel of the object, regardless of the path or direction. Δ d = 3 cm Origin Position It is a scalar value - it is given only as a number for its size with a unit.

Displacement is the overall change in position of an object. It is a vector quantity and must be given with a number for its size, a unit and a DIRECTION. ∆d = 3 cm Origin Position +

The formula for Displacement is found by the final position minus the initial position A change in any quantity is found by final minus initial values. ∆d = d 2 - d 1 initial position (origin) final position delta means “change in” vector

A toy car begins at -1 cm. If the car stops at +3 cm, calculate the distance and displacement of the car. d 1 = -1 cm d 2 = +3 Position ∆d = 4 cm+ Δ d = 4 cm Origin ∆d = d 2 - d 1 ∆d = (+3) - (-1)

Draw a number line to show a car moving from a start of +2 cm and stops at the -3 cm mark. Find the displacement of the car. Origin Position ∆d = 5 cm - d 1 = +2 cm d 2 = -3 ∆d = d 2 - d 1 ∆d = (-3) - (+2)

If you walked around this block, what would your Distance be? ∆ d = 100 m 100 m Δ d = 300m Your Displacement would be? [East] 100 m

Instants and Intervals of Time

In physics, Time occurs two ways: An instant of time is a reading at a particular, precise moment. An interval of time is total amount of time between two instants. Interval = instant 2 - instant 1

∆ t = t 2 - t 1 Instant or interval of time is a SCALAR quantity. scalar “change in” Interval final instant initial instant

d = d 2 - d 1 t = t 2 - t 1