Torque Practice
10 problems · instant feedback · full explanations
Torque is r × F: force times lever arm times sin θ. For balance problems, clockwise torques must equal counterclockwise torques about any pivot.
Q1.
What are the SI units of torque?
Multiple choice · Easy
Q2.
A 50 N force pushes perpendicular at the end of a 0.4 m wrench. What is the torque?
Numerical answer (N·m) · Easy
Q3.
A 60 N force is applied at 0.5 m from a pivot, at 30° to the lever arm. What is the torque?
Numerical answer (N·m) · Medium
Q4.
A 40 kg child sits 2 m left of a seesaw pivot. What mass must sit 1 m right of the pivot to balance?
Multiple choice · Medium
Q5.
A mechanic pulls with 120 N perpendicular at the end of a 0.25 m wrench. What torque is applied to the bolt?
Numerical answer (N·m) · Easy
Q6.
Why are doorknobs placed far from the hinges?
Multiple choice · Easy
Q7.
Torque and energy share the same SI units, but torque is a vector quantity.
True / False · Medium
Q8.
A force applied exactly through the pivot point produces zero torque about that pivot.
True / False · Easy
Q9.
A 30 N force at 0.6 m acts clockwise and a 20 N force at 1.0 m acts counterclockwise on a wheel. What is the net torque?
Numerical answer (N·m) · Hard
Q10.
Slipping a pipe over a wrench handle (a cheater bar) to loosen a stuck bolt works because it gives:
Multiple choice · Medium