psd2 054 ☈ Name:

  1. On Monday I rode a RipStik up a gentle slope, turned around, and came back down the slope.
    Arc of a RipStik graph
    1. ___________________ What is the name of the shape formed by the curve on the graph?
    2. ___________________ Between zero and ten seconds, what is happening to my velocity?
    3. ___________________ At exactly ten seconds, what is my velocity according to the graph?
    4. ___________________ Between ten and twenty seconds, what is happening to my velocity?
  2. The data in the table and graphs are from a lab three ball dropping experiment.
    Ball fall
    _______________ _________ According to the data and graphs, what is the acceleration of gravity?
  3. A marble with a mass of 5 grams sits on a banana leaf 10 centimeters vertically above the table. The acceleration of gravity g of 980 cm/s².
    1. _________ __________ Calculate the Gravitational Potential Energy of the marble.
    2. _________ __________ At the bottom of the banana leaf the same marble is moving at a velocity of 100 cm/s. Calculate the Kinetic Energy of the marble.
    3. ______________ As a percentage of the original Gravitational Potential Energy, how much energy was lost to friction and other sources of energy loss?
  4. Mathematical models Mathematical models on the half shell background rectangle major grid lines axes x-axis and y-axis a square root path a quadratic path data points as circles linear regression line data points as rectangles data points as diamonds text layers Mathematical relationships x-axis labels A B C
    1. _____ Identify by the letter which of the mathematical relationships on the graph represents the time versus distance relationship for a RipStik moving at a constant linear velocity with no acceleration.
    2. _____ Identify by the letter which of the mathematical relationships on the graph represents the time versus distance relationship for a ball falling under the constant acceleration of gravity g.
    3. _____ Identify by the letter which of the mathematical relationships on the graph represents the height versus velocity relationship for a marble rolling from a height h down a banana leaf and onto a flat table.
  5. 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.
      Graphical analysis

      Pulleys

      Force(gmf)Load (gmf)
      00
      2070
      40140
      60210
      80280
      100350
      background rectangle major grid lines axes text layers Pulley data force (gmf) load (gmf) y-axis labels 0 40 80 120 160 200 240 280 320 360 400 x-axis labels 0 20 40 60 80 100
    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%?
  6. Write out Newton's first law.
  7. Give a mathematical statement of Newton's second law.
  8. Write out Newton's third law.
  9. __________ __________ 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.

Body mass index= mass in kg height in meters2
slope= ( y2 − y1 ) ( x2 − x1 )
Volume V = length l × width w × height h
mass m = density ρ × Volume V
ρ= m V
distance d = velocity ѵ × time t
ѵ= Δd Δt

Gravitational Potential Energy GPE = mgh
acceleration of gravity g = 980 cm/s²
Kinetic Energy KE = ½mѵ²
momentum = mass m × velocity ѵ
Force F = mass m × acceleration a
efficiency= Actual Mechanical Advantage Ideal Mechanical Advantage