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Science Library Quiz

Gravity and freefall

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: If it takes a hammer 1.0 second to fall $5$ metres on Earth, how long does it take to fall the same distance on the Moon?





Question 2: Approximately how fast is a heavy ball travelling after 4 seconds of freefall?




Question 3: A falling object accelerates at about 10 m/s2 if we ignore air resistance. How fast do you have to throw a ball upwards for it to take 3 seconds before you catch it again?




Question 4: A rifle can fire a bullet at 900 m/s. Ignoring air resistance, how long would the bullet stay in the air if it is fired straight up? Rifle muzzle velocity





Question 5: Astronaut David Scott dropped a hammer and a feather on the Moon. What did this demonstrate?




Question 6: How many fundamental forces are there?





Question 7: A skier makes a jump as shown in the photo. What shape is his flight? Ski jump




Question 8: A rocket accelerates upwards at 20 m/s2 for 8 seconds. How high is it?




Question 9: When a parachutist freefalls and opens his chute, the force of gravity on him




Question 10: When a parachutist freefalls and opens his chute, his velocity




Question 11: A ball follows the shape of a parabola when it bounces. What are the vertical and horizontal components of its motion: Ball bouncing




Question 12: A boy throws a ball straight up into the air. The time the ball takes to reach the top of its flight...




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Question: A smooth, heavy steel ball is droppd from rest. After $t_1$s it passes point X, after $t_2$s it passes point Y. The distance $h$ is the distance between X and Y. What is the acceleration of free fall?




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