Universal Law of Gravitation

Slide 1: Tuesday October 24 • Objective: SWBAT explain gravitational force changes with mass and distance. • A-Team: • Homework: Read pg. 352-354 in book, Blood Pressure in Space wksht • Catalyst: What’s one thing you’ve decided to do in order to reach your big goal this quarter?

Slide 2: Time is up (No. No complaining. Five minutes every day.)

Slide 3: Universal Law of Gravitation Before we start… today I’ll give you a hint This is the moment where you start taking some notes. Today you will do that on the front side of your worksheet.

Slide 4: Universal Law of Gravitation • Gravity is a universal force • There’s a fancy equation we need to know about Mass of object 1 Gravitational Constant m1m2 The F G 2 force Mass of object 2 d A distance apart from each other in meters (and squared)

Slide 5: 4 things to know 1. Gravity is a force, and things that are forces are measured in Newtons

Slide 6: 2. G is a constant. WARNING: It’s an ugly looking number. N  m2 6.674  10 11 kg 2 Example of another constant that you know? 

Slide 7: 4 things to know 3. As mass increases, force increases This makes sense if we look at the equation m1m2 F G 2 d If the number on the top part of the fraction gets bigger, then the whole answer is going to be bigger

Slide 8: 4 things to know 3. As mass increases, force increases

Slide 9: 4 things to know 3. As mass increases, force increases

Slide 10: 4 things to know 3. As mass increases, force increases

Slide 11: 4 things to know 4. As distance increases, force decreases This makes sense if we look at the equation m1m2 F G 2 d If the number on the bottom part of the fraction gets bigger, then the whole answer is going to be smaller

Slide 12: 4 things to know 4. As distance increases, force decreases

Slide 13: 4 things to know 4. As distance increases, force decreases Both go to Turner and get to sit next to each other in class Close together, strong attraction

Slide 14: 4 things to know 4. As distance increases, force decreases He goes to Roosevelt and she goes to Turner Further away, much less attraction

Slide 15: Let’s recap 1. Gravity is a force measured in Newtons 2. G in the equation is a constant 3. As mass increases, force increases 4. As distance increases, force decreases