A scale attached to an object reads zero in free fall.
In free fall, the scale will read zero as both the mass and the scale are accelerating downward at g.
Video: download and step through the video one frame art a time to see that the scale reads zero while the scale and object are falling.
Download video (right-click and “save link as”, 160 KB): Freefallscale.m4v
NCEA & Science Curriculum
SCI 1.1, PHYS 2.4
Drop the scale with suspended object. Scale will read zero. This has to be filmed. You can’t read the scale while it is falling.
Download the video and step through the video one frame art a time to see that the scale reads zero while the scale and object are falling, or make your own video.
Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.
Penny and Feather in a Vacuum
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PIRA 1G20.41 and PIRA 1G20.42
This teaching resource was developed with support from