What is the difference between these science terms: inertia, mass, weight?

**Inertia** measures how difficult it is to move an object.

**Mass** measures how much material is in an object.

**Weight** measures the force of gravity acting on an object. Often times referred to how heavy an object is.

** Problem: **Compare ** Freddie** (a small stuffed toy) with **Ellie** (a real elephant).

Each Question is stated two different ways. First a common description is given. Second, a more scientific description is given. The scientific terms inertia, mass, and weight are printed in red.

1. a. Who is heavier, Freddie the frog or Ellie the elephant?

1.b. Who has more weight, Freddie the frog or Ellie the elephant?

2. a. Who would be harder to move, Freddie or Ellie ?

2. b. Who has more inertia, Freddie the frog or Ellie the elephant?

**3.a. **Who has more material in their body, Freddie or Ellie?

**3. b. **Who has more mass, Freddie the frog or Ellie the elephant?

**Answer:** Did you choose Ellie the elephant as the answer for each question? If so, you understand that:

- things that are
**heavier**have more**inertia.**

- the more mass an object has the greater is its inertia.

- the more inertia something has the harder it is to move it.

**Summary:** Complete each sentence using these works:

less more

**1. **Ellie has __________ weight than Freddie. (more, less )

**2. **Fredie has ______ mass than Ellie. (more, less)

Because Ellie is _________ and more __________ than Freddie, Ellie has ________ inertia.