Newton's Law of Gravitation
Earth and Space

All masses fall at the same rate

Classroom Activity for 11-14 Supporting Physics Teaching

What the Activity is for

Modelling falling.

The aim is to provide a framework to discuss the two effects that mass has on acceleration when something falls.

What to Prepare

  • the modelling program VnR
  • the file that shows how the model is built, and will help you to prepare your support for students thinking through their own constructions (see below)

What Happens During this Activity

Using VnR, build up a model like this one. Probably you'll want to have a couple of masses to hand – 1 kilogram and 5 kilogram – to use to prompt questions, so making the whole experience more interactive for the class than is possible with this clip, which just lays out the argument.


Download to use with this activity.

Newton's Law of Gravitation
is expressed by the relation F=G(m_1)(m_2)/r^2
can be used to derive Kepler's First Law

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