* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Which will fall faster?
Survey
Document related concepts
Equations of motion wikipedia , lookup
Classical mechanics wikipedia , lookup
Classical central-force problem wikipedia , lookup
Specific impulse wikipedia , lookup
Length contraction wikipedia , lookup
Seismometer wikipedia , lookup
Centripetal force wikipedia , lookup
Velocity-addition formula wikipedia , lookup
Newton's laws of motion wikipedia , lookup
Transcript
2/17 & 2/18 - 8th Grade Agenda Learning Objective: Learn about Gravity Collect HW: Reading & Notetaking p.177 – 178 Balloon Rocket Lab Textbook Reading p. 389 - 392 HW: Reading & Notetaking p.180 – 181 Reminder Science Fair Board due 2/24 (50 Points) Daily Reflection • Prompt: Write 3 question about gravity. For an object to stay in motion, a orce has to act on it. F_____ The tendency of an object to resist change in its motion is nertia called I________ Which will fall faster? • Will a lighter object fall faster or a heavier object? • Will a piece of paper fall faster or a text book? Why? • Lets try. Which will fall faster? • Will a penny fall faster or stack of a3 pennies? Why? • Lets try. The force that pulls objects toward each other is called ravity G______ If two balls with different masses are dropped to the ground in a vacuum, would they fall exactly the same rate? • Yes The amount of matter in an ass object is called M_____ Why does a leaf fall more slowly than an acorn? • Because of air resistance. • In a vacuum, both would fall at the same speed What is the terminal velocity (final velocity) of a sky diver? • 122 mph • 50% of terminal velocity is reached in 3 seconds • 90% of terminal velocity is reached in 8 seconds. • 99% of terminal velocity is reached in 15 seconds. How many meters will an object fall in 1 second? • 9.8 meters • Every 1 second, speed will increase by 9.8 m/s How much do objects accelerate as they fall? • On earth objects accelerate at 9.8 m/s2 • After 1 second, object will be falling at 9.8 m/s • After 2 seconds, object will be falling at (9.8 + 9.8) 19.6 m/s • After 3 seconds, object will be falling at (9.8 + 9.8 + 9.8) 29.4 m/s • The velocity will continue to increase until it reaches terminal velocity • For a sky diver the terminal velocity is about 56 m/s (124 miles / hr) What is the difference between weight and mass? • Weight is a measure of the force of gravity on an object, and mass is a measure of the amount of matter in that object. The law of universal gravitation ravity states that the force of G______ ll acts between a___ objects in the universe. • Even a book is exerting a gravitational force on you.