Notecard Quiz

1
Notecard Quiz

• Name ______________ Date _______ Period __
• Activity 83, Analysis 3b

2
Activity 86 Analysis

• How did you rank the stability of the carts that
  had three different centers of mass? Describe the
  observations that determined your rankings.
• How did the higher center of mass affect the
  carts motion after it hit the barrier?
• When the cart hits the barrier, a force is
  applied to the lower part of the car, causing it
  to decelerate
• The inertia of the part of the carts mass that
  is above the barrier cause it to continue to move
  forward

3
(No Transcript)
4

• Imagine three identical barrels, one empty, one
  full of water, and one half-full of water.
• Explain why the lowest center of mass is located
  there.
• The center of mass is lowest on barrel B, because
  there is more mass in the lower half of the
  barrel than the top half, making the
  concentration of mass below the center.
• Even distribution of mass puts the center of mass
  in the middle of the other two barrels

d. Relatively high center of mass and low mass
5

• Your friends parents want to haul some lumber in
  their station wagon. His parents are not sure
  whether to put the lumber in the wagon or tie it
  on the roof rack. What advice do you give them?
  Explain in terms of center of mass.
• Put the wood in the wagon
• Lower center of mass
• Safer because it makes the vehicle more stable
• Why do you think pickups and SUVs tend to roll
  over more often than passenger cars of similar
  mass? Explain in terms of center of mass.
• Due to higher ground clearance and overall
  profile, SUVs have a higher center of mass
• Easier for center of mass to move outside of the
  wheelbase and cause the vehicle to roll over.

6
Activity 86 Major Concepts
7
Read page 427 in PH
8
Buoyancy

• Title The Penny Boat Lab
• Purpose To demonstrate buoyancy by building a
  ship out of aluminum foil.
• Problem How many pennies will your ship hold?
• Hypothesis I predict my foil ship will hold
  ____ pennies before it sinks.

9
Data/Observations
Table 1 My Boat
Boat Name Number of Pennies

Table 2 Class Results
Boat Name Number of Pennies
Make 16 rows- one for each ship

Mean (average)
Median (middle value)
10
Data/Observations (cont.)

• You will draw 3 accurate pictures
• My Boat Picture
• Most Pennies Boat
• Least Pennies Boat

11
Im not sure what to do!
Thoroughly dry the pennies after you have tested
your boat. Lay your pennies out on a paper towel
and pat them dry. Then dry each penny as you put
it back in the cup. Dont destroy your boat when
you are done.

• Read the procedure!
• Read the procedure!
• Read the procedure!
• Read the procedure!
• Read the procedure!

12
To Sink or Not to Sink,That is the Question!
Happy Sailing!
13
Buoyancy Video
http//www.youtube.com/watch?v2afDLk-JzEYfeature
related