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Related Concept Videos

Torque01:10

Torque

23.2K
Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
841
Torque Free Motion01:15

Torque Free Motion

899
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
899
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

6.2K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
6.2K
Potentiometer01:30

Potentiometer

2.3K
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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Related Experiment Video

Updated: Mar 13, 2026

Method to Measure Tone of Axial and Proximal Muscle
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Published on: December 14, 2011

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Manual Detection of Spatial and Temporal Torque Variation through a Rotary Switch.

H Z Tan, Shuo Yang, Z Pizlo

    IEEE Transactions on Haptics
    |January 1, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Human perception of torque variations in rotary switches relies on spatial, not temporal, features. This finding offers insights for designing better rotary switches.

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    Area of Science:

    • Human-Computer Interaction
    • Mechanical Engineering
    • Sensory Perception

    Background:

    • Rotary switches are common input devices.
    • Understanding user perception of torque feedback is crucial for design.
    • Current understanding of torque perception in rotary switches is limited.

    Purpose of the Study:

    • To investigate whether torque perception is determined by spatial or temporal characteristics of rotary switches.
    • To determine the key factors influencing manual detection of torque variations.
    • To provide data for improved rotary switch design.

    Main Methods:

    • Three experiments were conducted to measure manual detection thresholds of torque variation.
    • Experiment I varied the spatial period of sinusoidal torque profiles.
    • Experiment II varied the temporal frequency of torque profiles.
    • Experiment III assessed detection at different user-controlled rotation speeds.

    Main Results:

    • Detection thresholds were measured across a range of spatial periods (2.8° to 180°) and temporal frequencies (2 to 300 Hz).
    • Comparison of results from all experiments indicated that torque variation detection is dependent on spatial, not temporal, characteristics.
    • User-controlled rotation speed in Experiment III did not alter the primary spatial dependency.

    Conclusions:

    • The manual detection of torque variations in rotary switches is primarily governed by spatial parameters.
    • Temporal aspects of torque profiles have a lesser impact on user detection.
    • Findings can inform the engineering and design specifications of rotary switches for enhanced user experience.