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### Thursday/Friday September 22-23

UNIT 2Two 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

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?

ConcepTest 3.4a Firing 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.

Projectiles: Zero Launch Angle

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

Projectile Motion

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

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

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?

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?

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?

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?

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?

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