CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 4. Motion and Forces

3. Why is there a tidal bulge of water on the opposite side of Earth from the moon?


4. When are tides highest? What causes these tides to be highest?


5. When are tides lowest? What causes these tides to be lowest?

Review

1. What is the traditional definition of gravity?


2. Identify factors that influence the strength of gravity between two objects.


3. Define weight. What is the SI unit for weight?


4. Explain why an astronaut would weigh less on the moon than on Earth.