2-D Kinematics
Drop-Shoot predictions
• Clicker questions about the drop-shoot
demonstration
• Do this AFTER talking about components,
and why we split things into X & Y
• Independence of X & Y vectors
What do you prefer?
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1. HW C due Thur, lab due Wed
2. HW C due Wed, lab due Thurs
3. No prefer
One ball is dropped. The other is shot horizontally
simultaneously. Which hits the ground first?
1. Dropped ball
2. Horizontally shot ball
3. Both at the same time
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One ball is dropped. The other is shot horizontally
simultaneously. Which has larger verticalcomponent to its velocity at the end when they hit?
1. Dropped ball
2. Horizontally shot ball
3. Both are the same time
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Projectile firing across flat ground
• Several clicker questions to be done
BEFORE the projectile launcher demo
• Do these AFTER drop-shoot demo and 12 numerical questions (3.24 & handout #1)
Which object has a faster horizontal
component to velocity? All have the same
TOTAL speed.
1. Object launched at 30 degrees
2. Object launched at 45 degrees
3. Object launched at 60 degrees
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Which object spends more time in the air
when flying over FLAT ground? All have the
same TOTAL speed.
1. Object launched at 30 degrees
2. Object launched at 45 degrees
3. Object launched at 60 degrees
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When firing a projectile across FLAT ground, the
projectile will go furthest if launched at an angle:
1. 0-30 degrees
2. 30-60 degrees
3. 60-90 degrees
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Launch projectile over FLAT ground
• 15 degrees
• 30 degrees
• 40 degrees
• 45 degrees
Show the next few Clicker questions before
50, 60, 75 degrees.
Which goes further?
1. Object launched at 30 degrees
2. Object launched at 60 degrees
3. Both go the same distance
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Firing projectiles across NOT-FLAT ground
• Clicker questions upcoming
When firing a projectile down a hill, the projectile
will go furthest if launched at an angle:
1. Greater than 45 degrees
2. Equal to 45 degrees
3. Less than 45 degrees
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When firing a projectile up a hill, the projectile will
go furthest if launched at an angle:
1. Greater than 45 degrees
2. Equal to 45 degrees
3. Less than 45 degrees
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Hunter-Monkey demo
• Clicker question predictions
Where will the bullet go?
1. Above the monkey
2. Below the monkey
3. Hit the monkey
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Bullet fired much faster. What will it do?
1. Above monkey
2. Below monkey
3. Hit the monkey
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Bullet fired much slower. What will it do?
1. Above monkey
2. Below monkey
3. Hit the monkey
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