pse1 054 064 ↹ 21 February 2014 ↹ Name:

1. The graph shows pulley data gathered by a student in physical science.
   1. Plot the data provided in the table on the graph below and draw a line through the points.
      
   2. ____________ Based on the data, what is the Actual Mechanical Advantage for the pulley system?
   3. ____________ The pulley system had four load lines. What is the Ideal Mechanical Advantage?
   4. ____________ Use the preceding two questions to calculate the efficiency of the pulley system.
   5. ______________ What was the likely cause of the efficiency being less than 100%?
2. ____________ During a RipStik ride in the classroom I held a ball in the palm of my outstretched hand. The ball and I were moving at a constant speed and then I suddenly stopped. The ball kept going. Which of Newton's laws explains why the ball kept going?
3. _____________ Which of Newton's law governs the accelerating motion of a RipStik?
4. __________ __________ A RipStik was accelerated using a force of 15 Newtons. The mass of the RipStik and the rider was 75 kilograms. Calculate the acceleration of the RipStik.
5. Temperatures in Celsius:
   • _________℃ What is the temperature of a mix of melting ice and water?
   • _________℃ What is the temperature of melting solidified coconut oil?
   • _________℃ What is the typical daily indoor room temperature in Pohnpei?
   • _________℃ What is the typical daily sunny day outdoor temperature in Pohnpei?
   • _________℃ What is the temperature of the healthy living human body?
   • _________℃ What is the temperature of a boiling water?
6. For the following pulley systems, write on the picture the Ideal Mechanical Advantage for each system:
   
7. The following xy scattergraph plots heat conduction temperature plotted as squares. The linear line is the best fit trend line mathematical model. The round circles are a mathematical model called a logistic model.
   
   Linear mathematical model: temperature = 0.40*time + 27.23
   Logistic mathematical model: $\text{temperature}=\frac{7}{(1+e^{-0.6(\text{time}-8)})}+27$
   ______________________ Which mathematical model best fits the data, the linear or the logistic model?

$\text{slope}=\frac{(y_2-y_1)}{(x_2-x_1)}$
Force F = mass m × acceleration a
$\text{efficiency}=\frac{\text{Actual Mechanical Advantage}}{\text{Ideal Mechanical Advantage}}$