Archimedes and Acceleration Archimedes Acceleration Pre-test/ Study Guide.
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Transcript of Archimedes and Acceleration Archimedes Acceleration Pre-test/ Study Guide.
Archimedes and Acceleration
ArchimedesAcceleration
Pre-test/ Study Guide
Bell Work
How does Archimedes principle apply to this picture? The metal cylinder originally was balanced with the metal piece on the other end. Now it is not
Answer this thought in your notebooks and draw a sketch of the setup.
Bellwork
Video and Discussion
Archimedes Four SquareUsing only your Prentice Hall Book – Draw this in your notebook and answer each
Square. You will have 20 minutes to quietly work on this.
Density1. What is the formula for density?2. How do you know if an object will float
or sink?3. Answer predicting question (in Figure 7
explanation on page 425)
Buoyancy1. What is the buoyant force?2. Copy the Figure 10 on page 427 but
DRAW THE FORCE ARROWS THE WAY WE LEARNED IN CLASS! Draw in the net force on each of the objects.
3. What force acts opposite the buoyant force?
Archimedes’ Principle(Page 427-9)1. What is “Archimedes’ Principle?”2. Why did the two canisters in Figure 11
displace different amounts of water?(Displace means to move…)
3. Does the buoyant force change on a submarine as it rises or sinks?
Practice1. Copy figure 12 on page 4292. Why does the boat float when another
object with a similar mass sinks?3. How does this apply to the boat you
made in the Penny Lab?
Acceleration!
AccelerationLet’s Review: What is Speed? Velocity?
What is a Vector?
Acceleration: RATE at which velocity changes
Refers to INCREASING speed, DECREASING speed, or CHANGING direction.
Is Acceleration a Vector?
A softball accelerates when it is thrown, hit, or caught. What
change in motion occurs in each example?
Thrown- ball accelerates as it is thrown
Hit- ball changes directionCaught- ball decelerates (negative
acceleration)
How can a car be accelerating if its speed is constant at 65 km/h?
The arrows are larger as the plane increases speed or accelerates…the arrows represent the vector quantity.
Calculating Acceleration
Final Velocity - Initial Velocity
Time
Vf - Vi
t
Beginning Velocity
Final Velocity
Time
a =
Example:As a roller coaster starts down a slope, its
velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction.
What is its acceleration?Initial Velocity: 4 m/sFinal Velocity: 22 m/s
Time: 3 s
Final Velocity – Initial Velocity/ Time22 m/s – 4 m/s
3 s
18 m/s = 6 m/s/s or 6 m/s2
3 s
Graphing Acceleration Speed vs. Time
Graph Upward means
speed is increasingLine is straight means acceleration is constant
A horizontal line (flat) would mean that the object is moving at a constant speed.
Slope on a speed vs. time graph represents acceleration
Distance vs. Time Graph Curved line means
that the objects is accelerating (nonlinear).
During each second, the object traveled a greater distance than the second before.
Slope is speed and since slope is getting steeper and steeper, you can conclude that speed is also increasing…or that the object is accelerating.
Let’s Practice
THE END!