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Physical Science Wed 10-31

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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.
- Understandable, readable
- Questions?

- Pg 390 1-8 Review of Simple Machines
- Halloween Physical Science Connections

1) Connect the following concepts to some aspect of the Halloween celebration events

- AccelerationConstant Velocity
- Unbalanced ForcesBalanced Forces
- Free FallFriction Forces
- Newton’s 1st LawNewton’s 3rd Law
- 2nd Class LeverWheel and Axle
- MomentumFrame of reference
- WorkPower

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

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?

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