Exercise 4: Discussion

Exercise 4.1 (5 marks)

In the picture below Kari uses a catapult to simultaneously fire treats to Physics Girl and Phi Fox. The treats follow the trajectories shown. Explain how we know that Physics Girl receives her treat before Phi Fox. Please keep your answer to half a page or less and feel free to use words, equations, diagrams, or all three. (Please note that diagrams will be included in the half-page limit.)

A diagram of three characters, Kari on the left, Physics Girl on the right, and Phi Fox between of them. There are two parabolas: one used to signify the trajectory from a treat being fired from Kari on the left to Phi Fox in the middle. The other parabola signifies the trajectory of a treat being fired from Kari on the left and Physics Girl on the right. The treat going toward Phi Fox follows a is taller parabola, but has a net displacement shorter than the treat going toward Physics Girl.

Helpful hint: You can use the idea that the x and y directions can be treated separately; they are independent of one another. Ignoring air resistance, we know the acceleration in both directions (what is it?).

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Physics 1A03 - Laboratory Experiments Copyright © by Physics 1A03 Team is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, except where otherwise noted.