Ball falls at 16 feet/second, at 22 mph If you fall for 2 seconds 3 seconds Mass vs weight Weight is a function o the gravitational field you're in, measured with a scale, measures how much the earth is pressing you down, weight changes based on the gravitational pull you're in. If you could stand on the surface of Jupiter your weight would be much higher, Jupiter has much more gravity. On the moon astronauts would have less weight . Dependent upon the gravitational field you're in. Mass Constant throughout the universe, not dependent on the gravitational field you're in. Why astronauts float? There in a constant free fall they’re truly in an elevator shaft that never ends, going 5 miles/sec, • but the earth curves at Since they're going 5 miles every 1 second, 18,000 miles/hour, moving 5 miles in 1 second, also • dropping 16 feet. Although they've dropped 16 feet the earth has curved 16 feet, they're not getting any closer to the earth, virtually free falling around the earth The only exception is if something slows them down • Things that can slow them down, something hitting them, ◦ How long would it take that ball to hit the ground? When you throw an object at 16 feet, leveled it will take 16 feet to hit the ground How fast you have to get going in order to orbit around the earth 18,000 miles/hr • Need to do this above the earths atmosphere (100 miles) because of friction if you move this fast • within earths atmosphere the friction is bad What does your speed remain in space? • Makes no difference how you fly because theres no friction • How far can you see If you're standing at the ocean how far can you see to the horizon?