Warm up A swimmer is resting at the edge of the pool talking to his coach. The coach then begins walking along the edge of the pool. The swimmer swims.

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Presentation transcript:

Warm up A swimmer is resting at the edge of the pool talking to his coach. The coach then begins walking along the edge of the pool. The swimmer swims to the opposite edge to beat the coach. If the swimmer is walking with an average velocity of 2.5 m/s, how fast does the swimmer have to beat the coach to the opposite side? Dimensions of the pool 50 m by 25m.

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Physics Honors A/B–Day 10/06 – 10/07/15 2D motion

Agenda 2 dimensional motion – Relative motion Projectile motion Examples Work on problems

Recall Vectors Vectors have components

Recall Vectors Vectors have components

Example problem A plane flies north at a velocity of 100 km/hr against a headwind of 25 km/hr. What is the resultant velocity?

Example problem A plane flies north at a velocity of 100 km/hr with a tailwind of 25 km/hr. What is the resultant velocity?

Example problem A plane flies north at a velocity of 100 km/hr with a sidewind of 25 km/hr east. What is the resultant velocity?

So how do we perceive relative motion Relative motion

Which coordinate am I in?

Projectile Motion What is a projectile?

What is a projectile and projectile motion? A projectile is any object that is only being accelerated by gravity. The objects we have been throwing up until now have been projectiles as well. Ex. Throwing balls at an angle above the horizontal. Ex. Throwing ball horizontally off a cliff.

Projectile Motion

At the maximum height

Projectile Motion

Ball has initial velocity in the x and y directions

Projectile Motion

How can we look at these motions Horizontal Motion (x)Vertical Motion (y) Velocity AccelerationNo acceleration; a = 0Constant a So that means what about the equations we use in each direction X – direction (Horizontal) y – direction (Veritcal)

Example Problem

Two kids are sliding a plate back and forth to each other. One misses and it slides off the table. If the table is 1.05 m high and the plate flies off the table with a horizontal velocity of 0.74 m/s. How long does it take to fall to the ground? How far from the end of the table does it land?