That is constant motion to you and me.

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Presentation transcript:

That is constant motion to you and me. LINEAR MOTION That is constant motion to you and me.

I. VECTORS AND SCALARS A scalar is a quantity that has just a magnitude. Usually just a number. NO direction. Ex. 15 sec 2.0 kg

I. VECTORS AND SCALARS A vector is a quantity that has a magnitude and a direction. It is a number and a direction (E, N, W, S, up, down, left, right……) Ex: 4.0 m South 25 mph North We use arrows to represent vectors. Position (x) Current location

II. DISTANCE VS. DISPLACEMENT Distance is a SCALAR. It is the total length travelled. Symbol (d) Ex: I ran 2.2 miles Displacement is a VECTOR. Symbol (∆d, or Δx) It is the displacement of an object from the original position. You run a lap on the track. Your distance is ¼ mile, but your displacement is 0 miles Must have a direction.

II. DISTANCE VS. DISPLACEMENT Example: A student goes to lunch and he walks 20 m East then turns and goes 80 m North. He pauses and turns and goes 10 m West. What is his distance? What is his displacement? 10 m W ∆d 80 m N 20 m E

III. SPEED AND VELOCITY Speed is a scalar. Velocity is a vector. No direction S = d/t Measured in m/s It is the total distance divided by the time. Velocity is a vector. Must have direction v = ∆d/t, or Δx/t It is the displacement divided by the time.

III. SPEED AND VELOCITY HERE IS A HINT, DRAW A PICTURE! Example: A teacher walks 10 m South, forgets something and goes back 10 m North. She then goes 10 m South and turns West and goes 40 m. Then she turns and goes 25 m North to make copies. If it took her 45 seconds to do this trip, find: Distance Displacement Speed Velocity HERE IS A HINT, DRAW A PICTURE!