A force of 20 N is applied at an angle of 60 degrees to a lever arm of 2 m. What

Practice Questions

Q1
A force of 20 N is applied at an angle of 60 degrees to a lever arm of 2 m. What is the torque about the pivot?
  1. 10 Nm
  2. 20 Nm
  3. 30 Nm
  4. 40 Nm

Questions & Step-by-Step Solutions

A force of 20 N is applied at an angle of 60 degrees to a lever arm of 2 m. What is the torque about the pivot?
  • Step 1: Identify the force applied, which is 20 N.
  • Step 2: Identify the distance from the pivot to where the force is applied, which is 2 m.
  • Step 3: Identify the angle at which the force is applied, which is 60 degrees.
  • Step 4: Use the formula for torque: Torque = Force × Distance × sin(θ).
  • Step 5: Substitute the values into the formula: Torque = 20 N × 2 m × sin(60°).
  • Step 6: Calculate sin(60°), which is √3/2.
  • Step 7: Substitute sin(60°) into the formula: Torque = 20 N × 2 m × (√3/2).
  • Step 8: Simplify the equation: Torque = 20 × 2 × (√3/2) = 20√3 Nm.
  • Torque Calculation – Torque is calculated using the formula Torque = Force × Distance × sin(θ), where θ is the angle between the force and the lever arm.
  • Trigonometric Functions – Understanding how to apply the sine function to find the effective component of the force that contributes to torque.
  • Units of Measurement – Recognizing that torque is measured in Newton-meters (Nm) and ensuring unit consistency in calculations.
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