# Foundations of Physics: Motion, Forces & Newton's Laws
> Learn the basics of physics: the scientific method, motion, speed vs. velocity, acceleration formulas, and Newton's three laws of motion for physical science.

Tags: physics-basics, scientific-method, newtons-laws, motion-and-forces, acceleration-formula, kinematics, physical-science, education
## Unit 1: The Foundations of Physics
- Introduction to Motion, Forces, and the Nature of Science by Ready Global Academy.

## The Nature of Science
- Definition: Physics studies the fundamental laws of nature (how and why things exist and move).
- The Scientific Method: Observation → Question → Hypothesis → Experiment → Conclusion.

## Variables in Experiments
- **Independent Variable (IV):** The factor changed on purpose (e.g., amount of force).
- **Dependent Variable (DV):** The factor that changes as a result (e.g., acceleration speed).
- **Controlled Variables:** Factors kept constant for a fair test (e.g., mass, surface type).

## Motion: Distance vs. Displacement
- **Distance:** Total length of path traveled (scalar).
- **Displacement:** Straight-line distance and direction from start to finish (vector).

## Speed vs. Velocity
- **Speed:** Distance / Time (e.g., 10 m/s).
- **Velocity:** Displacement / Time (e.g., 10 m/s East).
- Example: A car driving 50 km North then 30 km South has a displacement of 20 km North.

## Acceleration
- Definition: The rate of change of velocity.
- Formula: `a = (vf - vi) / t` (Final velocity - Initial velocity / time).
- Units: meters per second squared (m/s²).
- Negative acceleration indicates deceleration.

## Graphing Motion
- **Position vs. Time Graph:** Slope equals velocity. Horizontal line means the object is at rest.
- **Velocity vs. Time Graph:** Slope equals acceleration. Horizontal line means constant velocity (zero acceleration).

## Newton's Laws of Motion
- **1st Law (Inertia):** Objects resist changes in motion. More mass equals more inertia.
- **2nd Law (F=ma):** Force = mass × acceleration. Force and acceleration are directly proportional.
- **3rd Law (Action-Reaction):** For every action, there is an equal and opposite reaction (e.g., rocket launches, swimming).

## Summary
- Key pillars of Unit 1 include the Scientific Method, calculating motion/acceleration, and applying Newton's Three Laws to physical scenarios.
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