Torque
Physics ⇒ Mechanics
Torque starts at 11 and continues till grade 12.
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See sample questions for grade 12
Define torque and state its SI unit.
Describe the physical significance of the sign (positive or negative) of torque.
Explain the difference between torque and force.
Explain why opening a door is easier when you push at the edge farthest from the hinges.
A force of 10 N is applied perpendicular to a wrench at a distance of 0.3 m from the pivot. Calculate the torque produced.
A force of 12 N acts at a distance of 0.4 m from the axis of rotation at an angle of 60°. Calculate the torque produced.
A force of 20 N acts at an angle of 30° to a lever arm of length 0.5 m. Calculate the torque produced.
A force of 8 N is applied at a point 0.25 m from the axis of rotation, making an angle of 45° with the lever arm. Calculate the torque produced.
Which of the following best describes a couple?
(1) Two equal and opposite forces acting along the same line
(2) Two equal and opposite forces acting along different lines
(3) Two unequal forces acting at the same point
(4) Two forces acting at right angles
Which of the following does NOT affect the magnitude of torque?
(1) Magnitude of force
(2) Distance from axis of rotation
(3) Angle between force and position vector
(4) Mass of the object
Which of the following is NOT a unit of torque?
(1) N·m
(2) kg·m²/s²
(3) Joule
(4) dyne·cm
Which of the following is the correct formula for torque (τ)?
(1) τ = F × r
(2) τ = F / r
(3) τ = r / F
(4) τ = F + r
Fill in the blank: The cross product of the position vector and force vector gives the ________ vector.
Fill in the blank: The net torque acting on a rigid body is equal to the product of its moment of inertia and its ________ acceleration.
Fill in the blank: The SI unit of torque is ________.
Fill in the blank: The torque produced by a force is maximum when the angle between the force and the position vector is ________.
True or False: If the line of action of a force passes through the axis of rotation, the torque produced is zero.
True or False: The direction of torque is always perpendicular to the plane formed by the position vector and the force vector.
True or False: The net torque on a body determines its angular acceleration.
True or False: The torque due to gravity on a body acts through its center of mass.
