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# Physical Science Wed 10-31 - PowerPoint PPT Presentation

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. P384 MA = 4.0 MA = 66 MA = 1 Output force = 78 N

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### Physical Science Wed 10-31

Homework

Halloween

Energy

• Still have all yellow-books and papers to grade

• All old homework is due now!!!

• P384 1-5

• P384 Review 1-8

• P384

• MA = 4.0

• MA = 66

• MA = 1

• Output force = 78 N

• Output distance = 0.53 m

• 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

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

• Required from each student:

• A list of all simple machines used in the Mousetrap game

• The following information on each machine:

• A neatly presented table/list of all simple machines in the Mousetrap game.

• Questions?

• 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 Physical Science.

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?

Halloween questions Physical Science.

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 Physical Science.

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?