Technische Mechanik ยท interactive
Textbook in Motion
Exam-sheet drawings that move. Each page integrates the real equations of motion in your browser; change the numbers and watch what happens.

Problem 7
Two Masses Collide After a Quarter Pipe
Same start, two coefficients of restitution. Friction, a spring, every impact.

Problem 20
Double Pendulum, Twice
Two identical pendulums, a hair apart at the start. Drag the rods and watch them part ways.

Problem 18
Newton's Cradle with e < 1
Lift one, two or three balls; pick e and watch the row slowly merge into one swing.

Problem 11
Pendulum on a String That Goes Slack
Release it above the horizontal: the string sags, the mass falls, the string jerks tight.

Problem 15
Inverted Double Rod on a Shaker
Shake the pivot fast enough and the rods stand upside down. Ease off and they fall.