Simple Machines experiment: test self-locking screws
In Simple Machines, kids twist a set of screws to lift and hold up a trio of sloshing fish tanks. In this activity, you can test the self-locking abilities of screws by seeing if water splashes out of a container when dropped.
Download and print the activity here.
- 2 plastic bottles, 1 with a screw top and 1 with a push top (if you can’t find a push top, get 2 screw tops)
- water (to fill the bottles)
- clothes that can get wet
Test self-locking screws
- Fill the water bottles.
- Push the top closed on one bottle and screw the top closed on the other.
- Go outside!
- Drop the bottles.
Which bottle stays shut and which bottle bursts open?