Transcript Physical Science Wed 10-31 - elyceum-beta

Physical Science Wed 10-31
Homework
Halloween
Energy
Any more Simple Machines
Pictures?
• Still have all yellow-books and papers to
grade
• All old homework is due now!!!
Homework assignment
• P384 1-5
• P384 Review 1-8
Homework
•
1)
2)
3)
4)
5)
P384
MA = 4.0
MA = 66
MA = 1
Output force = 78 N
Output distance = 0.53 m
Homework: Section 1 review
1) Work = force x displacement
Power = how fast (rate) work is
completed
2) a. yes
b. no
c. yes (gravity)
3) Smaller input force, greater input distance
4) Long ramp has greater mechanical
advantage over a shorter ramp
Homework:
5) W = 75 J
6) MA = 2.4
7) a. W=1200 J
b. P=300 W
8) P = 20,000 W or 20 kW
Mousetrap game Analysis
Mousetrap game analysis
• Required from each student:
• A list of all simple machines used in the
Mousetrap game
• The following information on each machine:
Type and
Class of
Machine
Description Input
Of parts or
(effort)
Actions used Force
in making
Output
(Load)
Force
Fulcrum
(If there
Is one)
Example
Type and
Class of
Machine
Description
Of parts or
Actions
used
in making
Input
(effort)
Force
Output
(Load)
Force
Fulcru
m
(If there
Is one)
1st class
Lever
Blue
See-Saw
Weight
Of
yellow
ball
Force
applied
to
Green
Man
At
center
of
seesaw
By Friday, 3:00 pm
• A neatly presented table/list of all simple
machines in the Mousetrap game.
• Understandable, readable
• Questions?
Homework/Classwork
• Pg 390 1-8 Review of Simple Machines
• Halloween Physical Science Connections
Answer the following questions that
connect Halloween to Physical
Science.
1) Connect the following concepts to some aspect
of the Halloween celebration events
• Acceleration
Constant Velocity
• Unbalanced Forces
Balanced Forces
• Free Fall
Friction Forces
• Newton’s 1st Law
Newton’s 3rd Law
• 2nd Class Lever
Wheel and Axle
• Momentum
Frame of reference
• Work
Power
Halloween questions
2) If you go out trick or treating, what will be your
overall displacement?
3) Estimate how many residences do you visit on
your best trick or treat run?
4) Estimate the length between one door to the
next on your journey to gather candy?
5) Use your answers in 3 and 4 to estimate your
overall distance
Halloween questions
6) Estimate the total number of pieces of
candy you got on your best run.
7) If the average piece of candy weighs 5.5
grams, estimate the total mass of your
candy haul in kilograms
8.a) What is the total weight of your candy?
Halloween questions
8.b) Draw a free-body diagram of a
Jack-O-Lantern being pushed across a
table.
9) You are accelerating at 3.4 m/s2 away
from a pack of demented Teletubie
dressed 7 year olds with your bag of
candy from question 7. What is the net
force applied to your bag?
• 10) Create a short story-description of a
Halloween event to which you can relate
the following ideas correctly:
– Terminal Velocity
– Force of Air Resistance
– 1st class Lever
– Wedge
– Change of momentum
• Answer all on a clean sheet of paper
• Best story (description) gets a 3 point
bonus for the 2nd marking period