4 Newton's Laws of Motion - BC Science Physics 11
4 Newton's Laws of Motion - BC Science Physics 11
4 Newton's Laws of Motion - BC Science Physics 11
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Investigation 4-3 Newton’s Third Law<br />
Purpose<br />
To observe demonstrations <strong>of</strong> Newton’s third law and identify the action and reaction forces<br />
Procedure<br />
Part 1: Exploding Carts<br />
Figure 4.3.2 Laboratory carts<br />
1. Push two identical laboratory carts together so that their spring bumpers are compressed. Release the carts on<br />
a flat table or floor. Observe as they accelerate away from each other.<br />
(a) What force makes the carts accelerate?<br />
(b) Why do the two carts, <strong>of</strong> identical mass, accelerate at the same rate?<br />
(c) How does this demonstration illustrate Newton’s third law?<br />
2. Predict what will happen if you double the mass <strong>of</strong> one <strong>of</strong> the carts by placing an extra cart on top <strong>of</strong> it. Test<br />
your prediction.<br />
(a) Has the force repelling the carts changed?<br />
(b) What has changed?<br />
3. Try making the mass <strong>of</strong> one <strong>of</strong> the carts much greater than the mass <strong>of</strong> the other.<br />
(a) Is the force changed?<br />
(b) What has changed?<br />
<strong>11</strong>8 Chapter 4 Newton’s <strong>Laws</strong> <strong>of</strong> <strong>Motion</strong> © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6
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