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Related Concept Videos

Kinematic Equations - I01:26

Kinematic Equations - I

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When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
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Kinematic Equations - II01:17

Kinematic Equations - II

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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
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Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Problem-Solving: Tuning of a Guitar String01:04

Problem-Solving: Tuning of a Guitar String

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In the case of stringed instruments like the guitar, the elastic property that determines the speed of the sound produced is its linear mass density or the mass per unit length. This is simply called the linear density. If the string's linear density is constant along the string, then the linear density is simply the total mass divided by the total length.
The string's wave speed can be regulated by varying the linear density. Tension is the other property that determines the speed of...
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Kinematic Equations - III01:18

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The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
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Related Experiment Video

Updated: Jan 21, 2026

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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Identify Kinematic Features for Powered Prosthesis Tuning.

Ming Liu, Ashling Lupiani, I-Chieh Lee

    IEEE ... International Conference on Rehabilitation Robotics : [Proceedings]
    |August 4, 2019
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    Summary
    This summary is machine-generated.

    Researchers identified key body movement features that change with powered prosthetic leg settings. This finding could help automate prosthetic tuning, making it more accessible and affordable for amputees.

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    Area of Science:

    • Biomechanical Engineering
    • Rehabilitation Robotics
    • Prosthetics

    Background:

    • Powered prosthetic legs require expert tuning for optimal user benefit.
    • Current tuning processes are costly and limited by expert availability.
    • Extracting expert knowledge can reduce costs and improve accessibility.

    Purpose of the Study:

    • To identify kinematic features sensitive to control parameter changes in powered prosthetic legs.
    • To assess the feasibility of automating prosthetic leg tuning.
    • To reduce customization costs and improve training for tuning experts.

    Main Methods:

    • Collected kinematic data from three transtibial amputees.
    • Tested four levels of push-off power during level ground walking.
    • Analyzed 13 preselected kinematic features across three joints on the prosthesis side.

    Main Results:

    • A change in push-off power significantly affected several kinematic features.
    • Six specific kinematic features across three joints were identified as sensitive to power adjustments.
    • Demonstrated a quantifiable link between control parameters and user biomechanics.

    Conclusions:

    • Preliminary identification of sensitive kinematic features is achievable.
    • This research lays the groundwork for automated tuning systems for powered prosthetics.
    • Findings can inform the development of more efficient tuning expert training programs.