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UNIT 2 Two Dimensional Motion And Vectors. ConcepTest 3.4a Firing Balls I. 1) it depends on how fast the cart is moving 2) it falls behind the cart 3) it falls in front of the cart 4) it falls right back into the cart 5) it remains at rest.

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UNIT 2 Two Dimensional Motion And Vectors

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Unit 2 two dimensional motion and vectors

UNIT 2Two Dimensional Motion

And Vectors


Unit 2 two dimensional motion and vectors

ConcepTest 3.4aFiring Balls I

1) it depends on how fast the cart is moving

2) it falls behind the cart

3) it falls in front of the cart

4) it falls right back into the cart

5) it remains at rest

A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball?


Unit 2 two dimensional motion and vectors

ConcepTest 3.4aFiring Balls I

when viewed from train

when viewed from ground

1) it depends on how fast the cart is moving

2) it falls behind the cart

3) it falls in front of the cart

4) it falls right back into the cart

5) it remains at rest

A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball?

In the frame of reference of the cart, the ball only has a vertical component of velocity. So it goes up and comes back down. To a ground observer, both the cart and the ball have the same horizontal velocity, so the ball still returns into the cart.


Thursday friday september 22 23

Thursday/Friday September 22-23

Projectiles: Zero Launch Angle


Unit 2 two dimensional motion and vectors

TODAY’S AGENDA

Thursday, September 22

  • Projectile Motion

  • Mini-Lesson: Zero Launch Angle

    • Problem Quiz 1 Vectors

  • Hw: Complete Practice C Problems (all)

UPCOMING…

  • Fri:More Zero Launch Angle

  • Mon:Projectile Motion @ any angle

  • Tues:LAB 3: Projectile Motion

  • Wed:Problem Quiz 2 Projectile Motion


  • Unit 2 two dimensional motion and vectors

    Projectile Motion

    Something is fired, thrown, shot, or hurled near the earth’s surface.


    Unit 2 two dimensional motion and vectors

    One Dimensional Projectile


    Unit 2 two dimensional motion and vectors

    Two Dimensional Projectile


    Unit 2 two dimensional motion and vectors

    Horizontal Component of Velocity


    Unit 2 two dimensional motion and vectors

    Horizontal Component of Velocity


    Unit 2 two dimensional motion and vectors

    Vertical Component of Velocity


    Unit 2 two dimensional motion and vectors

    Horizontal and Vertical Motion


    Unit 2 two dimensional motion and vectors

    Horizontal and Vertical Motion

    Perpendicular

    components of

    motion are

    independent of

    each other.


    Unit 2 two dimensional motion and vectors

    Launch Angle


    Unit 2 two dimensional motion and vectors

    Launch Angle


    Unit 2 two dimensional motion and vectors

    Zero LaunchAngle

    Vo


    Unit 2 two dimensional motion and vectors

    Sample Problem

    1)

    The Zambezi River flows over Victoria Falls in Africa. The falls are approximately 108m high. If the river is following horizontally at 3.60 m/s just before going over the falls, what is the final velocity of the water when it hits the bottom? Assume the water is in freefall as it drops.

    Find the time of flight

    Find the final vertical velocity


    Unit 2 two dimensional motion and vectors

    continued…

    Find the time of flight

    1)

    Find the final vertical velocity

    Ө

    Final horizontal velocity


    Unit 2 two dimensional motion and vectors

    Sample Problem

    2)


    Unit 2 two dimensional motion and vectors

    Sample Problem

    3)


    Unit 2 two dimensional motion and vectors

    Sample Problem

    4)

    A lunch pail is accidently kicked off a steel beam on a building under construction. Suppose the initial horizontal speed is 1.50 m/s.

    a)How far does the lunch pail fall after it travels 3.50 m horizontally?


    Unit 2 two dimensional motion and vectors

    Sample Problem

    4)

    A lunch pail is accidently kicked off a steel beam on a building under construction. Suppose the initial horizontal speed is 1.50 m/s.

    b)If the building is 2.50 x 102 m tall, and the lunch pail is knocked off the top floor, what will be the horizontal displacement of the lunch pail when it reaches the ground?


    Unit 2 two dimensional motion and vectors

    Sample Problem

    4)

    A lunch pail is accidently kicked off a steel beam on a building under construction. Suppose the initial horizontal speed is 1.50 m/s.

    c)If the building is 2.50 x 102 m tall, and the lunch pail is knocked off the top floor, what is the final velocity the lunch pail when it reaches the ground?


    Unit 2 two dimensional motion and vectors

    Sample Problem

    5)

    The LZ N07 is a newly designed airship in the manner of the old Zeppelin airships built in Germany between 1908 and 1940. This airship can travel with a horizontal speed of 1.30 x 102 km/h.

    If a parcel is dropped from this airship, so that it lands 135 m in front of the spot over which it was released, how far above the ground is the airship?


    Unit 2 two dimensional motion and vectors

    Sample Problem

    6)

    A squirrel on a limb near the top of the tree loses its grip on a nut, so that the nut slips away horizontally at a speed of 10.0 cm/s.

    If the nut lands at a horizontal distance of 18.6 cm, how high above the ground is the squirrel?


    Unit 2 two dimensional motion and vectors

    END


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