Torque — Science definition
Turning effect of a force about a specified pivot.
Where it is taught
- Springs, Torque & Static Equilibrium — Forces, Rotation & Equilibrium, Physics & Environmental Science, Grade 12
In use
Torque magnitude about a chosen pivot is τ=rF sinθ, with θ between the radius-to-application-point and the force.
Springs, Torque & Static Equilibrium
Questions using torque
Problem 1
Hints
State what the supplied observations or conditions establish, and separate that from any assumption.
Answer and explanation
Zero net force prevents translational acceleration; zero net torque prevents angular acceleration.
Problem 2
Answer and explanation
No. The vector force sum must also vanish, and the starting state must be at rest.
Static equilibrium means the body remains at rest without translational or rotational acceleration. It needs ΣF=0 and Στ=0 about a selected pivot in the rigid-body model. Equal opposing torques alone can coexist with nonzero net force, while balanced forces can still form a turning couple. For this weightless-bar example equal downward loads at equal opposite arms balance torque, and the upward support must balance their combined 60 N force.
No. The vector force sum must also vanish, and the starting state must be at rest.
Response criteria
- Interpret labels, structures, axes, units and directions correctly.
- Explain the physical or environmental relationship or mechanism.
- Respect stated assumptions and distinguish observation from inference.