1. Gravitational Fields Unit Lesson 2: Force Fields, Cavendish experiment, & NULG
Reminder: Review overview powerpoint on LVSpace “Gravitational Fields Presentation”
Homework 1 (due next lesson)
Read section 21.3 & answer summary questions 1-4, pg 345

2. Overview – syllabus (from the 7407/8 specification)

3. Gravitational force is both a cause and an effect
Fields cause forces.
Forces affect systems (e.g.- when a force acts on a system, the system experiences changes.)

4. Section 21.3 NULG
Estimate forces.
Assumptions for Newton’s Laws: point masses, R is between centre of masses of the objects (not surfaces).
Cavendish experiment: determining a numerical value for G using a torsion balance (pg 345)
Video: Cavendish experiment (3:27)

5. Section 21.1 gravitational field strength
For next lesson:
Find out Kepler’s 3 laws and write them down.
Read section 21.1 (pg )
Homework 1 (due next lesson)
Read section 21.3 & answer summary questions 1-4, pg 345