course phy121
What is the definition of rate of change? Rate of change is the difference between the finan and initial values of a variable.
What is the definition of average velocity?
The averge speed an object traverses a distance at.
What is the definition of average acceleration?
The average rate at which the velocity of an object changes.
What are the four equations of uniformly accelerated motion.
(I had to refer to my notes for these)
vF = v0 + (a * `dt)
`ds = (v0 + vF)/2 * `dt
`ds = v0 * `dt + .5 * a * `dt^2
vF^2 = v0^2 + 2a * `ds
You will be expected to know these.
What is the definition of work?
Work = m * `ds
What is the definition of kinetic energy?
Kinetic engery is the energy of motion. I'm not sure of the equasion.
What is the definition of potential energy?
Potential energy is the energy stored by an object due to lifting or displacing it.
What does the work-kinetic energy theorem say?
KE = work done on an object by the Fnet
I'll will refer to my notes tonite and try to find the equasions for potential energy and kinetic energy."
1. What is the definition of rate of change?
The given definition is as follows:
The rate of change of A with respect to B is (change in A) / (change in B).
2. What is the definition of average velocity?
The definition of average velocity is as follows:
average velocity is average rate of change of position with respect to clock time
By the definition of rate of change we therefore have
average velocity = (change in position) / (change in clock time).
3. What is the definition of average acceleration?
The definition of average acceleration is as follows:
average acceleration is average rate of change of velocity with respect to clock time
By the definition of rate of change we therefore have
average acceleration = (change in velocity) / (change in clock time).
4. What are the four equations of uniformly accelerated motion.
`ds = (v0 + vF)/2 * `dt
vF = v0 + (a * `dt)
`ds = v0 * `dt + .5 * a * `dt^2
vF^2 = v0^2 + 2a * `ds
5. What is the definition of work?
The work done by force F acting through displacement `ds is `dW = F * `ds, provided both the force acts along the same line as the displacement.
6. What is the definition of kinetic energy?
kinetic energy = 1/2 m v^2
7. What is the definition of potential energy?
The change potential energy is work done against a conservative force; in the example of gravity the change in potential energy when lifting an object is the work done to accomplish the lift; if the object falls the potential energy decreases by the same amount.
8. What does the work-kinetic energy theorem say?
The theorem says that the work done on an object by the net force acting on it is equal to the change in its kinetic energy.
You should compare your answers to these. Some of your answers were pretty good, while some weren't correct.
I suggest that you insert self-critiques into a copy of the questions and the answers you gave here, marking insertions with &&&&.
There are eight questions here, and eight answers. You should ideally be able to remember these questions and their answers without having to refer to your notes. At the very least you should be able to answer the questions clearly and completely, at any time.
Then you will be in a position to apply these ideas, and you will better recognize how they are applied in qa's and Introductory Problem Sets, as well as in the text.
At the link http://www.vhcc.edu/ph1fall9/fall%2008/081119.htm you will find a more extensive set of questions, covering the entire semester.