Maximum Speed
Clean Pull
In the clean pull, the lifter's objective is to maximize the vertical displacement of the bar. In order to do so the lifter must attain a maximum velocity.
In this picture, the lifter pulls the bar to a maximum height of 1.2m. She took 0.57s to reach this height. The initial velocity of the bar is 0m/s. Now we can find the velocity of at which the bar was displaced.
Given: a=9.8m/s^2 Δd=1.2m Δt=0.57s
In the clean pull, the lifter's objective is to maximize the vertical displacement of the bar. In order to do so the lifter must attain a maximum velocity.
In this picture, the lifter pulls the bar to a maximum height of 1.2m. She took 0.57s to reach this height. The initial velocity of the bar is 0m/s. Now we can find the velocity of at which the bar was displaced.
Given: a=9.8m/s^2 Δd=1.2m Δt=0.57s
Clean
Once the bar has reached maximum height, the lifter then gets under the bar to catch it. The catch occurs in a low squat. From the squat, the lifter must push up to come to a standing position. I calculated the velocity of this push.
Given: a=9.8m/s^2 Δd=0.6m Δt=0.85s
Once the bar has reached maximum height, the lifter then gets under the bar to catch it. The catch occurs in a low squat. From the squat, the lifter must push up to come to a standing position. I calculated the velocity of this push.
Given: a=9.8m/s^2 Δd=0.6m Δt=0.85s
Jerk
The bar is now resting on the anterior deltoids and next step is to push the bar up. I calculated the velocity of the bar when it begins to move. The bar begins to move at the lowest knee bend.
Given: a=9.8m/s^2 Δd=0.67m Δt=0.81s
The bar is now resting on the anterior deltoids and next step is to push the bar up. I calculated the velocity of the bar when it begins to move. The bar begins to move at the lowest knee bend.
Given: a=9.8m/s^2 Δd=0.67m Δt=0.81s
Acceleration
Acceleration is how quickly an object's velocity changes over time.
Clean Pull
Once the maximum velocity is found, you can then solve for the acceleration.
Clean Pull
Once the maximum velocity is found, you can then solve for the acceleration.
The acceleration is later used to find the net force and the force applied in the clean pull.
Clean
Below is the calculation of acceleration using the maximum velocity found above. The acceleration is later used when finding the net force and the ground reaction force of the clean.
Clean
Below is the calculation of acceleration using the maximum velocity found above. The acceleration is later used when finding the net force and the ground reaction force of the clean.
Jerk
I have also calculated the acceleration in the jerk phase of the lift as shown below. This is later use when finding the net force and ground reaction force of the jerk.
I have also calculated the acceleration in the jerk phase of the lift as shown below. This is later use when finding the net force and ground reaction force of the jerk.
More equations
When solving for the maximum velocity of clean pull, time was not in the equation. To more accurate and to check my measurements, I solve for displacement using a different Big 5 equation.
The two displacements are close (1.27m and 1.38m) but won't affect the rest of the data.
The Big 5 equation:
The Big 5 equation:
Cannot be used to solve for any variable for the clean and jerk as the initial velocity is always zero. Because there is no projectile motion as this movement is vertical, this equation is not used.