Biomechanics Ch. 4
Yes you could! Important to note is that the Y-Axis represent force. The Red Line would represent the object that has the greater potential energy and this can be seen as it would have a greater impact force on the force plate.
By just looking at the graph, which line (red or white) would represent an object that had a greater potential energy?
ΔPE = 700J ΔPE = PE(final) - PE(initial)
Calculate the change in potential energy as the barbel is lowered from .75m to .05m Notice that the only things changing is the height of the barbell.
1. Kinetic Energy: Due to motion 2. Potential Energy: Due to position
Energy, the capacity to do work, has 2 main forms we are interested in. What are those 2 forms?
Answer: -40J
How much work did the Therapist do?
SE = 1/2K(ΔX)^2
How would you calculate the Strain Energy in an object? "Energy being formed due to the deformation of the object."
1. Gravitational PE: Energy due to an object's position to earth. 2. Strain Energy: Energy due to the deformation of an object.
Potential energy, due to the position of an object, has 2 types. What are the 2 types of PE?
Work
Regarding Work... - Work is calculating by the product of Force and Displacement. - Work can be both positive or negative due to displacement.
Height of 1.8M: 23.94J Height of 3.0M: 39.9 J
Solve these 2 examples regarding Potential Energy...
Direction, Force, Displacement
To calculate the work done, must know: Average acceleration Direction Average force Average velocity Displacement
All 3 do!
Which of the following energies make up the work - energy relationship? Strain energy Kinetic energy Gravitational potential energy
Strain Energy! Example: Think about when you stretch a rubber band. As the band is stretch, there is a form of energy being stored in the rubber band, and this energy being formed as a result of the deformation of the band is called Strain Energy. - Strain energy is related to the stiffness of the object, and the material property of the object.
What does this describe? "Energy due to the deformation of an object."
POWER!
What does this describe? "How quickly or slowly work is done."
Energy! Forms of Energy: Heat/Light/Sound
What does this describe? "The capacity to do work."
Work!
What does this describe? "The means by which energy is transferred from one object or system to another."
