074 SC 130 Physical science 01 March 2013 • Name:

Graph one shows the time versus distance data gathered for four different balls in laboratory 022. The first four questions are matching. Use the letters A, B, C, and D at the end of the lines on the xy scattergraph.

1. _____ Ball not moving: stationary.
2. _____ Ball slowing down.
3. _____ Ball moving at a constant non-zero speed.
4. _____ Ball speeding up.
5. ________ __________ Determine the speed of ball A between 4 and 5 seconds.
6. ________ __________ Determine the speed of ball C between 3 and 7 seconds.

7. Table one
   force (gmf)	load (gmf)
   20	50
   80	200
   140	350
   180	450

   The data in table one were measurements made for a three load line pulley. Plot the data in table one on graph two.
8. ____________ Based on the table one data and graph, what is the actual mechanical advantage for the pully system?
9. ____________ The pulley system in table one had three load lines. What is the ideal mechanical advantage?
10. ____________ Use the preceding two questions to calculate the efficiency of the pulley system.
11. __________ _____ A student measures a bar of soap with a length of 8.0 cm, a width of 5.6 cm, and a height of 2.4 cm. What is the volume of the soap?
12. __________ _____ A student measures a bar of soap with a length of 8.0 cm, a width of 5.6 cm, and a height of 2.4 cm. The soap has a mass of 90.0 grams. What is the density of the soap?
13. ____________________ A marble with a mass of 5 grams rolls 30 centimeters in 0.60 seconds. Calculate the momentum of the marble.
14. ____________________ A marble with a mass of 5 grams rolls 30 centimeters in 0.60 seconds. Calculate the kinetic energy of the marble.
15. ____________________ Calculate the height h necessary for a marble to have a gravitational potential energy equal to the kinetic energy of a 5 gram marble that rolled 30 centimeters in 0.60 seconds. Use 980 cm/s² for the acceleration of gravity g.
16. Temperatures (report answers in Celsius)
    • _________ °C What is the temperature of a mix of melting ice and water?
    • _________ °C What is the temperature of melting solid coconut oil?
    • _________ °C What is the typical daily room temperature in Pohnpei?
    • _________ °C What is the temperature of the healthy living human body?
    • _________ °C What is the temperature of a boiling water?
17. _________ _____ The classroom is at E 158° 09.651'. I was was at E 158° 09.308'. Use a value of 1842 meters per minute to calculate the distance from the classroom to me.
18. _________ _________ Floraleen walked from E 158° 09.693' to E 158° 09.600'. How far did Floraleen walk in minutes?
19. _________ _________ While walking from E 158° 09.693' to E 158° 09.600' Floraleen measured a distance of 188 meters. Calculate the number of meters per minute.
    
    The following questions require some thought and reasoning. The answers are not single word answers. Your answers should be supported by explanations backed up by citing the theories you have explored in class.
    
    
20. If a bar of soap has a density of one gram per centimeter, then what would the soap do when placed in water? Why?
21. If a ball is rolling around in a circle at a constant unchanging speed, then what will be the shape of the line on an xy scatter graph? Why?
22. If you drop a ball from 490 centimeters above the ground, then the ball will take one second to hit the ground. How high is the ball one half second after release? Is the ball half-way down? Less than half-way down? More than half-way down? Why?
23. During a RipStik ride under the solar panels I held a ball in the palm of my outstretched hand. I was moving at a constant speed and then I suddenly stopped. The ball kept going. Why did the ball keep going?
24. When using pulleys to lift loads you have to pull a string. The more pulleys, the more string you have to pull. What might be the nature of the mathematical relationship between the number of pulleys and the length of rope that must be pulled for a lift?
25. On Pohnpei, an uhm (um in some languages) uses black basalt rocks. Basalt does not conduct heat. Explain why this would be useful for an uhm rock.

$\text{slope m}=\frac{(\mathrm{y2}-\mathrm{y1})}{(\mathrm{x2}-\mathrm{x1})}$
Volume V = length l × width w × height h
mass m = density ρ × Volume V
$\rho =\frac{m}{V}$
distance d = velocity ѵ × time t
$ѵ=\frac{\Delta d}{\Delta t}$
$a=\frac{\Delta ѵ}{\Delta t}$
ѵ = at
d = ½at²
d = ½gt²
where g is the acceleration of gravity.
g = 980 cm/s² (cgs)
g = 9.8 m/s² (mks)
Gravitational Potential Energy = mgh
Kinetic Energy = ½mѵ²
momentum p = m ѵ
$\text{Force}=\Delta \text{momentum}$
$\text{Force}=\text{mass}\times \frac{\Delta ѵ}{\Delta t}$
Force = mass × acceleration
$\text{efficiency}=\frac{\text{actual mechanical advantage}}{\text{ideal mechanical advantage}}$
where:
a is acceleration
d is distance
Δ is "the change in" (greek lowercase delta)
m is mass
p is momentum
t is time
ѵ is velocity