The objects whose average speed you\'re to measure (in m/s) are A water drop rol

Question

The objects whose average speed you're to measure (in m/s) are A water drop rolling down a windowpane A marble rolling across a table after rolling down a ramp A ball pitched as fast as you can across a yard or field A ball, dropped from rest from a height of 2 m (or higher, if safe) Yourself, walking at your usual pace a distance of 10 m Yourself, walking at your usual pace a distance of 20 m Prediction Look over the list of average speeds to be measured, and record your prediction 5pred for each of them in m/s. For some, it may be easier to make predictions in units of cm/s initially, then convert to m/s. Which of the objects, if any, do you think will move with a constant speed from start line to finish line?1 Why? How do you think you'll be able to tell?

Explanation / Answer

1. .05 m/s 2. 1 m/s 3. 20 m/s 4. 3 m/s 5. 2 m/s 6. 2 m/s 5, 6 for sure. 1, 2 depend on the amount of friction present. 5, 6 assume you are walking at a constant pace. 1, 2 are more or less constant. If there is friction on the marble, it will slow down. The water droplet might reach a terminal velocity due to friction, however. 3,4 both are effected by gravity, meaning that their speeds will change over time due to F = ma

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