📚 Topic Summary
In science, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object to accelerate, decelerate, change direction, or change shape. Forces are all around us, from gravity pulling us towards the Earth to the push of our feet when we walk. Understanding forces is key to understanding how the world works!
We use units called Newtons (N) to measure forces. Larger forces have higher Newton values than smaller forces.
🧠 Part A: Vocabulary
Match the following terms with their definitions:
| Term |
Definition |
| 1. Force |
A. The force that pulls objects towards each other. |
| 2. Gravity |
B. A force that resists motion between surfaces. |
| 3. Friction |
C. A push or pull that can change an object's motion. |
| 4. Motion |
D. The act or process of moving or of changing position or orientation. |
| 5. Newton |
E. The standard unit of force. |
(Match the numbers to the letters!)
✍️ Part B: Fill in the Blanks
Complete the sentences below using the words provided.
Words: push, pull, gravity, friction, motion
When you open a door, you apply a _______. _______ is a force that slows things down when they rub against each other. The Earth's _______ keeps us on the ground. A _______ is the act of moving. A _______ is the opposite of a push.
🤔 Part C: Critical Thinking
Imagine you are pushing a heavy box across the floor. What are all the forces acting on the box? Explain each one.