solve/robotics
Robotics
Arms, drones and humanoids, simulated in MuJoCo.
Guides
Quizzes
Why a 20 kg arm only lifts 5 kgDynamics · UR5e arm
Easy
answerlab
Turning radius of a two-wheel robotKinematics · Warehouse robot
Easy
lab
How late can a drone brake?Dynamics · Skydio X2
Medium
lab
The walk-to-run speed limitLocomotion · Unitree G1
Medium
lab
How hard should a gripper squeeze?Manipulation · Franka Panda hand
Easy
lab
The steepest lean a drone can holdDynamics · Skydio X2
Medium
How far the capture point jumpsLocomotion · Unitree G1
Medium
Perfect in sim, falls on hardwareSim-to-real · Unitree G1
Hard
One joint at 1,000 degrees a secondKinematics · UR5e arm
Hard
answer
Backflip motors, sliding off a rampDynamics · Unitree Go2
Medium
answer
Hand still, elbow swingingKinematics · Franka Panda
Hard
answer
5 mm too high, 200 newtonsControl · Kinova Gen3
Medium
answer
One motor dead, spinning 5.6 turns a secondControl · Skydio X2
Hard
20 kg at the chest, falls with 12 at arm's lengthStatics · Unitree H1
Medium