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

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.

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

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

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?

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

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?

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?

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

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