# Air Resistance and Terminal Velocity

Instructions: answer the questions, check them carefully, and when you are sure they are all right, press submit. The number of correct answers will be displayed.

Question 1: When an object falls it increases speed, or accelerates. Air resistance causes the acceleration to:

Question 2: In the situation of an aeroplane flying horizontally at the speed of sound, 343 m/s, what is the acceleration?

Question 3: In an aeroplane gaining height, which of these is true?

Question 4: Which of these explains why a scrunched up sheet of paper falls faster than a flat sheet of paper?

Question 5: Which of these parameters explains why an object falling through air accelerates faster than the same object in water?

Question 6: In an experiment, a student drops one paper shape, and measures the acceleration and speed. He puts a second identical paper shape inside the first, and repeats the experiment. What does he observe?

Question 7: A boat doubles its speed. How much more thrust must the boat's engine provide to achieve this?

Question 8: The atmosphere on Mars is 1% the density of Earth's atmosphere, and Mars' mass is about 10% that of Earth's. At terminal velocity, what is the ratio of Mars' terminal velocity to Earth's?

Question 9: The atmosphere decreases in density the higher we go.
In which direction was Felix Baumgartner accelerating for most of his journey down, when he jumped 39 km in freefall on 14 October 2012?

Question 10: Which of these is the greatest when an aircraft is descending?