1. Physical Science Unit 3 Warm-Up
Work, Power and Simple Machines

2. Wednesday 9/18/13 Define Work Give an example of work
Turned in on Tuesday
Unit 2 review, remember you MUST have shown work for math problems b/c I gave out answers.

3. 9/19/13 Label the following as work or not work
Sliding a box across the floor
Lifting the box
Carrying the box to the next room
Lowering the box to the floor
Holding 200 lbs box over your head

4. 9/20/13
Use your formula sheet to write the equation that would go with the following units. HINT: first look at what each unit measures.
Kg, N
mL, g
s, m
W, s
m, N
m/s2, s

5. 9/23/13
EOCT review
How long does it take for a car that traveled 25 m to reach a speed of 15.25m/s?

6. Have out “Simple Machine Practice”
9/24/13
Have out “Simple Machine Practice”
Identify the simple machine that is in the complex machine below
Screw Driver
Stage Curtains
Flight of stairs
Nail
Hammer putting in a nail
Shovel

7. 9/26/13
Quiz Friday:
How much power is used if it take 25 N of force to move box 13.5 m in 45 seconds?

8. 9/30/13 Turn in Chapter 14 Vocab Review at the start of the period.
Warm-Up
How much time does it take to use 375 watts of power if 285 J of work was done?

9. 10/1/13 What is a compound machine?
Why is efficiency of a machine always less than 100 %?

10. 10/2/13
A crane lifts a 875 N load a height of 15 m in 95 s. What is the power of the crane? Warm-Ups Due today. From 9/18/13 to 10/2/13 should have 9 warm-ups. Questions are on teacher web-page if you’ve lost your answers