Monday October 22, 2012
Physics

Bellwork:
    1.  Why is that when you are walking across ice, you should try not to run?
       
    2.  If a machine were being designed to dig mines, would a leading edge that is small and tapered be     better than a wide and flat surface?  Explain?

Discuss torque, center of gravity, and balance.

Torque activity, determine how torque works and how to determine the mass of an unknown object using your knowledge of torque.

Physical Science A

Bellwork:
    1.  How does the output force compare to the input force if the mechanical advantage of a machine is     less than one, equal to one, and more than one?

    2.  IF you put in 400 joules into a machine and get 300 joule out, what is the efficiency of the machine?

    3.  How much work is done by a girl who pushes a cart of bricks if she applies a force of 500 N over a     distance of 10 meters in a time of 20 seconds?

Discuss simple machines and energy.

Demo: bowling ball


HW:  Review Questions.  Please answer the questions we will go over the answers tomorrow.

Test will be on wed.  We will take the practice test tomorrow and go over any questions that you may still have.