Educational worksheet on Newton's First Law of Motion, featuring a diagram of a car stopping and a person sliding forward, with fill-in-the-blank questions to reinforce understanding.

Problem Overview:

The task involves filling in the blanks in sentences related to Newton's First Law of Motion. The goal is to complete the sentences and then use the boxed letters to solve a puzzle.

Solution:

#### Step 1: Understanding Newton's First Law
Newton's First Law of Motion states:
- An object at rest tends to stay at rest.
- An object in motion tends to stay in motion at a constant velocity (speed and direction) unless acted upon by an external force.

#### Step 2: Filling in the Blanks

1. One example of an outside force that slows down moving objects is _______ _______ _______ _______ _______ _______.
- Answer: Friction, air resistance, gravity, etc. (Any one of these would work.)
- Boxed Letters: F R I C T I O N

2. Newton's law says that an object in motion will stay in _______ _______ _______ _______ _______.
- Answer: Constant motion.
- Boxed Letters: C O N S T A N T

3. Newton said that a moving object will travel at a steady _______ _______ _______ _______.
- Answer: Speed or velocity.
- Boxed Letters: S P E E D

4. Objects stay at rest or in motion until an outside _______ _______ _______ _______ interferes.
- Answer: Force.
- Boxed Letters: F O R C E

5. When an object is not moving, it is at _______ _______ _______.
- Answer: Rest.
- Boxed Letters: R E S T

6. A moving object will go in a _______ _______ _______ _______ _______ _______ line.
- Answer: Straight.
- Boxed Letters: S T R A I G H T

7. Isaac Newton described how objects behave with his _______ _______ _______ _______ of motion.
- Answer: Laws.
- Boxed Letters: L A W S

8. Another name for Newton's First Law of Motion is:
- Answer: The law of inertia.
- Boxed Letters: I N E R T I A

#### Step 3: Extracting Boxed Letters
From the answers above, the boxed letters are:
- F R I C T I O N
- C O N S T A N T
- S P E E D
- F O R C E
- R E S T
- S T R A I G H T
- L A W S
- I N E R T I A

#### Step 4: Solving the Puzzle
Using the boxed letters, we can form a word or phrase. Typically, these letters are rearranged to spell out a relevant term. In this case, the letters spell out:

"INERTIA"

Final Answer:

\boxed{INERTIA}