Name: Torque Lab
Go to: http://phet.colorado.edu/simulations/sims.php?sim=Torque and click Run Now.
- Click the tab at the top that says torque
- Set the force equal to 1 N.
- Click Go let this run for at least 10 seconds
- What is the torque on the wheel (include direction).
- What eventually happens to the lady bug?
- From Newton’s second law, a force will cause an ______.
- When considering angular motion, a torque will cause an ___________ (consider both torque equations)
- What must be the centripetal force that keeps the lady bug moving in a circle
- Why does this force eventually fail?
- Reset all, and set the force back to 1 N.
- Observe the acceleration vector as you start. Describe how it changes.
- Will the acceleration vector ever point directly to the center? Why / Why not? (the next steps might help you answer this question)
- Reset all. Set the force back to 1 N.
- Hit start, wait about 2 seconds, and set the brake force to 1 N. Hit enter and observe.
- Describe the motion of the wheel:
- What happened to the acceleration vector?
- What is the net torque?
- Reset all. Set the Force back to 1 N. Hit Start.
- After a few seconds, set the brake force equal to 3N and hit enter.
- Right after you set the break force, calculate the net torque (check with the graph)
- Eventually the disc stops and the net torque is zero. This is because the breaking torque changed as you can see in the graph. Why did it change?