Preparation for Test #3 (Monday, March 17)
Things to Remember
- Anything we did in class is fair game - whether I did it as an example on the board, or you did it in the student workbook.
- Anything from the Mastering Physics homework is fair game.
- Anything from the required reading assignments is fair game.
- Problems you are asked to solve may not look exactly like examples from class or homework, but will involve exactly the same processes or concepts. Don't just memorize examples, make sure you understand the physics concepts and the reasons behind the solutions.
- You MUST show all work or provide an explanation in order to receive full/partial credit. This includes multiple choice questions.
- Dr. Russell will provide you with the basic equations you will need (you can find the equation sheet on the PHYS-114 webpage)
Concepts and Skills you will be expected to demonstrate
- Given a graph of Force-versus-time determine the impulse
- Given a function showing how the force varies with time, and a time interval, determine the impulse (by integrating the force).
- Be able to use impulse to determine the change in momentum
- Use the conservation of momentum to compare the "before" and "after" of a collision (remember to draw the "before" and "after" pictures)
- Be able to determine the kinetic and potential energies (for gravity and springs) of an object if given its mass, speed and location.
- Be able to use Hooke's law (F = - k x) to relate the force, displacement and spring constant of a spring.
- Be able to use the conservation of energy (Ki + Ui = Kf + Uf) for problem that has a "beginning" and an "end"
- Given a graph of force-versus-distance determine the work done by the force as an object moves through a displacement
- Be able to use the work done by a force to determine the change in kinetic energy
- Understand the difference between conservative and non-conservative forces
- Be able to use the dot product for two vectors to determine the salar result
- Given magnitudes and directions for two vectors find the dot product
- Given the vectors in unit vector notation (i-hat and j-hat) find the dot product
- Given magnitudes and unit vector components for two vectors, determine the angle between the two vectors
- Use the conservation of energy (Ki + Ui + Wnc = Kf + Uf) for a problem that involves a "beginning" and an "end"
- for a problem that involves one object moving from one location to another location with springs, changes in height, and friction
- for a problem that involves two or more objects connected by a string, on slopes, with springs, friction, and changes in height
- Use the concepts of impulse, conservation of momentum, work, and conservation of energy to solve a problem with multiple parts. (only one concept will apply to each part) FOR EXAMPLE: A force (either given as an equation or as a graph) is applied to box A so that it acquires a velocity. Box A then collides and sticks with box B which may have a velocity. After the collision the boxes slide up a ramp with friction and compress a spring. Find the distance the spring is compressed.
NOTE: the smart way to use a practice test is to actually take it as a test with a 1-hour time limit in an uncomfortable room (classroom or library). The not-so-smart way to use a practice test is to just work through the questions as if they were homework questions. REMEMBER: There is no guarantee your test will have the same questions as on this practice test.
Here's a the answers --- but don't look at these until after you have worked the practice test.