Chapter 3 Motion in 2 dimension

Chapter 3 Objective Differentiate between scalar and a vector Understand how to calculate a vector Describe projectile motion on the x and y axis. Warm Up Take a look at the Velocity (v) ONLY. Why is it that on the left side the v is +, but on the right side the v is -

Vector vs Scalar Vectors – Have direction and magnitude Ex: force, velocity, acceleration, displacement Scalar – Magnitude only Ex: time, area, volume

All about Vectors V1 + V2= Resultant You can add them in any order or subtract them using opposites You can multiply or divide it by a scalar quantity and still get a vector - later USE : – Pythagorean Theorem for Magnitude – SOH CAH TOA for direction

Practice: Pg

Exit Ticket The water used in a fountain is recycled. A water particle travels 85m through a fountain and returns to the same point. What is the displacement? Which of the following are scalar and which are vectors? – Acceleration of a plane as it takes off – The number of passengers on the flight – The duration of the trip – The displacement of the flight – The amount of fuel required

Chapter 3 Objective Differentiate between scalar and a vector Understand how to calculate a vector Describe projectile motion on the x and y axis. Warm Up A novice pilot sets a plane’s controls, thinking that the plane will fly 250 km/hr to the north. If the wind blows at 75 km/hr to the south east, what is the plane’s resultant velocity? Use graphical techniques

Lab We will practice with a projectile launched horizontally. We will practice with the two equations needed to solve for the horizontal velocity. We are working ahead in regards to equations so ask questions if needed. Turn to page 98. We will review the example as a class. You job is to launch a penny with horizontal velocity off of your desk. You will be able to measure the vertical and horizontal distance. You know acceleration due to gravity. You will solve for velocity. Complete this task for 5 different velocities. Since you are solving for velocity the only way to tell it you are changing velocity is by changing the horizontal distance. So start off soft and then push the penny harder and harder off of the desk. Complete the data table Delta y (should not change) Delta x (will change with a harder push) A= acceleration always the same constant Vi=vx= this is where you solve

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Chapter 3 Objective Differentiate between scalar and a vector Understand how to calculate a vector Describe projectile motion on the x and y axis. Warm Up Find the magnitude and direction of the resultant velocity vector for the following: – A fish swimming at 3.0m/s relative to the water across a river that moves at 5.0m/s – A surfer traveling at 1.0m/s relative to the water across a wave that is traveling at 6m/s.

What is a Projectile? Any object moving through air or space acted on by gravity

Projectile Motion has BOTH horizontal and vertical components **draw picture on board **4 equations!!

Cars do not have constant acceleration; what objects do? Explain free falling objects, acceleration constant and its sign, why v slows then = 0 then speeds up and its sign Pactice pg

Exit Ticket HW pg 101 Practice E 1 and 4

Chapter 3 Objective Differentiate between scalar and a vector Understand how to calculate a vector Describe projectile motion on the x and y axis. Warm Up A baseball is thrown at an angle of 25 o relative to the ground at a speed of 23.0 m/s. If the ball was caught 42.0 m from the thrower, how long was it in the air? How high was the tallest spot in the ball’s path?

Exit Ticket Study