Exercise 3: Ball Thrown Up

Note: we are not taking any measurements with this exercise but discussing things qualitatively. Instead of dropping the object from the height of 1.0 m, let’s imagine you throw the object straight up into the air. Think about what happens to the ball the second after it has left your hand and is moving up (‘just after leaving hand’ in the chart below) and the second before it returns to your hand and is moving down (‘just before returning to hand’). If we set our coordinate system so that the origin is at the ground and upwards is the positive direction:

Exercise 3.1 (1 mark)

Fill in chart by circling one of each:

+ (positive) / 0 (zero) / – (negative)

and

↑ (increasing with time) / ↓ (decreasing with time) / c (constant with time)

Remember: velocity and acceleration have a magnitude and direction

Note that on Crowdmark you will choose the correct version of the table as a multiple choice question.

Exercise 3.2 (1 mark)

Using the concept of vectors and referring to your coordinate system, choose the best description of what happens to the velocity and speed just before the object returns to your hand (the highlighted cells in the above chart). Choose the correct answer on Crowdmark.

a. The velocity is zero and the speed is decreasing since the object is experiencing a constant negative acceleration.

b. The velocity is negative and the speed is decreasing since the object is experiencing a constant positive acceleration.

c. The velocity is positive and the speed is constant.

d. The velocity is zero and the speed is increasing since the object is experiencing a constant negative acceleration.

e. The velocity is negative and the speed is increasing since the object is experiencing a constant negative acceleration.

 

Before you continue!

Before continuing, be sure you have completed Exercises 3.1 and 3.2 on Crowdmark for grading.

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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.