11-20-08

As the bell rang, the students started to pour in from the halls anticipating yet another exciting physics class with Mr. Manning. Unusually he started the class without a daily question. He started reviewing the worksheet "More Physics Problems." Before going over the problems he reminded us to draw the "Free Body Diagram" first then to write ΣF both ways: ΣF=ma and ΣF=Fn+Fg. After that he then began to review the problems from the worksheet that were for homework. The first went over #2, **Danny Diver (mass= 70 kg) is accelerated upward by a diving board at 5.0 m/sq. s. How much force is the diving board applying to Danny?** he went through step by step on both equations making sure the students understood what was going on, he then arrived at the answer **1036N**. Then onto #3, He reminded the students they must use one of the kinematics equations from unit one to find acceleration. The question stated **A 940 kg race car accelerates from rest covering 40 in 3 s. What amount of net force is needed to cause this acceleration?** Once more going step by step, this time also showing the kinematics step he shows the class how to find the answer of **8360N**. And last but not least, **A 400 kg crate is pushed forward with a force of 1100 N. If the coefficient of friction is 0.40, what is the acceleration of the crate?** stated #4. And after explaining how to draw the FBD he shows how to find the answer -1.2 m/ sq. s. Mr. Manning then handed out another worksheet entitled "Even More Physics Problems." He reviewed the problems and how to do some of them, and let the class on their own to work either by themselves or in a group. Before the class left Mr. Manning reminded the class they had a test due the next day and that the review packet wa also due when they handed in the test.