Chapter 5 : Do listed problems.  
Simulations
Quiz 5

Conceptual Questions 4, 5 plus problems below.
3 4 5 21 22 23 30 34 35 36 38 39 40 41
Helpers 1!!  or Helpers 2!! Click these then  the "Practice Questions" and "Practice Problems" links in the left hand column.
Click here for 3,000 Solved Problems in Physics (Schaum's Solved Problems Series)
PLEASE REGISTER YOUR EMAIL AT THE BOTTOM OF THE PHYSICS 4A PAGE . SCROLL DOWN THAT PAGE TO FIND THE EMAIL REGISTRATION FORM !!! REGISTER AGAIN EVEN IF YOU HAVE ALREADY DONE SO; THE DATABASE HAS BEEN REFRESHED!
Problems
3.   The base ball player has three forces on him/her as he/she slides into second base along level ground.
4. The airplane is moving along level ground before lift off.  There are five (5) forces on the plane as it accelerates down the runway. You cannot ignore air resistance which behaves as a Drag Force in the direction opposite to the instantaneous  motion direction.
5. The arrow is NO LONGER IN CONTACT with the bow. Thus there are only two forces acting on the arrow. You cannot ignore air resistance which behaves as a Drag Force in the direction opposite to the instantaneous
motion direction.
In the above 3 exercises, clearly show the forces  and the direction of motion by drawing arrows.

The other diagramming problems i.e. 21, 22, 23, and 36 through 41,   have more requirements  including writing the EQUATIONS  for Newton's law for all relevant directions:

Sum of forces in the x direction =  pos - neg
Sum of forces in the y direction =  pos - neg

Be careful when you encounter inclined planes such as in problem 40 and 41. You must decompose the gravitational force into components along and perpendicular to the incline using trigonometric  symbols for the angle.

These issues were covered in both discussion  sections, 3-20-09. I hope you attended. Otherwise, contact me or a student who did attend.

MORE HINTS LATER !