Unit 1: Objects Move and Collide

Essential Questions:

What are forces and how do they affect the motions of objects?

Do objects always need a force to keep moving?

What happens when a moving object collides with something?

How do fossils provide evidence of an ancient collision that wiped out the dinosaurs?

Unit Vocabulary:

• cause

• collision

• effect

• exert

• force

• friction

• infer

• mass

• speed

• velocity

Student Work