Physics Sensei step-by-step solutions
Forces problems, solved step by step
Ramps, pulleys, ropes and elevators. Pick a problem like the one you’re stuck on and walk through it one step at a time. Each one has a version for your course level.
Ramps and friction
A box sliding down a rough ramp
How fast does a box speed up on a ramp with friction, and how fast is it going after it slides?
Then try three like it, with instant feedback: practice this problem (free account).
Want to try one yourself? Go to practice (free account).