1-15-08

To begin the class Mr. Manning handed back some old papers

He then handed back the test from yesterday,which we then proceede to go over.

We then each worked on the review packet

2.a Use the rise over run to find the slope of the graph, i got it to be 3.8. This means for every kg the downward force increases by 3.8 N b. Teh y-int tels you when Mass is zero what the downward force will be c.Downward force(N) = 3.8 N/kg * mass + 20(kg) d. Plug 500 into the above equation for mass. Solve and my answer was 1920N e. acceleration due to gravity f. If you have no mass then you do not have any wieght/downwad forc. Instrument could be measuring incorrectly g. Yes, all of the values are 20N off h. No, all of teh alues are 20N of what they should be

3. Law - describes what is happening in a large number of circumstances, broad Theory - "A widely accepted explanation of why something happens" Hypothesis - describes why something is happening, specific fact - proven

4. Sam is in dynamic equilibrium becasue she is moving. Although she is moving the forces acting on her are equal. Since she is in equilibrium the foces equal so the force she exerts is the same as friction, 20N.

5. a Velocity dislacement over time = velocity b Acceleration chand in velocity/time = acceleration c. N/A d. Changing accleration e. Hourly wage

7. Fg is the weight. G is the accleration do to gravity

13.a Yes, newtons 3rd law b The box can accleratie becasue it applys as much force as you apply to it to you. The force the box applys is inside the system and internal forces can ot cause acceleration. If the force the person apply is greater than the friction force it will accelerate

For the rest o the answers to the review packet you can visit moodle. The midterm for this class is Thursday January 22 @ 11:15am in room 127