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## Short Assignment Requirements

Follow the instructions slides and finish the report with all needed graphs on it.

## Assignment Description

Linear Kinetics in Excel

### Linear Kinetics

   For the data set “GRF of 2 Jumpers” assume:

   Body mass is 85 kg

   Body starts with an initial velocity of zero

   Body starts in a squat and leaves the ground when the COM rises 0.31m from the starting position

   Determine:

   Takeoff velocity (when leaving the ground)

   Peak force for GRF and effective force (∑Fy)

   Average force for GRF and effective force (∑Fy)

   Jump height

   Graph (put both jumpers on one graph, be sure to label!):

   GRF vs. time

   Position vs. time

   Velocity vs. time

   Acceleration vs. time

### Set Up the Data

  Open with Excel

  Insert a Column between Columns A and B

  Repeat to insert a second column

  Label Column B ‘Mass’

  Label Column C ‘Weight’

  Column D should be ‘GRF Jumper A’

  Column E should be ‘GRF Jumper B’

### Set Up the Data

  You were given body mass for both jumpers=85 kg

  Type this into column C and drag down

  Calculate body weight and fill column D with this number

Set Up the Data

  Add two columns between columns D and E

### Determine acceleration from GRF data

Σ Fy= may Σ Fy=GRFy+Fg

ay=GRFmy+Fg

### Determine acceleration from GRF data

Σ Fy= may Σ Fy=GRFy+Fg

ay=GRFmy+Fg

Determine Velocity from

### Acceleration

  𝑣𝑓 =𝑎𝑡𝑓 −𝑡𝑖 +𝑣𝑖

Determine Velocity from

### Acceleration

  𝑣𝑓 =𝑎𝑡𝑓 −𝑡𝑖 +𝑣𝑖

### Determine Position from Velocity

  𝑝𝑓 = 𝑣𝑡𝑓 −𝑡𝑖 +𝑝𝑖



𝑝𝑓 = 𝑣𝑡𝑓 −𝑡𝑖 +𝑝𝑖

### Determine

  Takeoff velocity (when leaving the ground)

  Body starts in a squat and leaves the ground when the COM rises 0.31m from the starting position

  Peak force for GRF and effective force (∑Fy)

  Average force for GRF and effective force (∑Fy)

  Jump Height

  vi=0

  vf2=vi2+2a∆p

v2

∆p=

19.62

### Determine

  Takeoff velocity (when leaving the ground)

  Body starts in a squat and leaves the ground when the COM rises 0.31m from the starting position

  2.75 m/s

  Peak force for GRF and effective force (∑Fy)

  Peak GRF= 3214.57

  Average force for GRF and effective force (∑Fy)

  Average GRF= 2002.60

  Jump Height

  vi=0

  vf2=vi2+2a∆p

v2

∆p=

19.62

### Linear Kinetics

  Determine:

  Takeoff velocity (when leaving the ground)

  Peak force for GRF and effective force (∑Fy)

  Average force for GRF and effective force (∑Fy)

  Jump height

  Graph (put both jumpers on one graph, be sure to label!):

  GRF vs. time

  Position vs. time

  Velocity vs. time

  Acceleration vs. time

## Assignment Description

KIN445 Linear Kinetics in Excel                                                       Name:______________________________

Complete the table with the data from the two jumpers:

 Jumper A Jumper B Takeoff Velocity Peak GRF Average GRF Peak Effective Force Average Effective Force Jump Height

Make sure that each graph has a title, axis labels with units, and a legend!

GRF vs. Time

Position vs. Time

Velocity vs. Time

Acceleration vs. Time

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