# Newton's laws and equilibrium

7 videos
1 skill
4A: Apples would not fall without a force to propel them downward. These three laws described by the famous Englishman centuries ago still inform our understanding of the physical world today. When you push a patient’s bed down the halls of the hospital, you are providing a force in a direction. If we know the magnitude of the force we provide as well as the mass of the patient and the hospital bed, we can calculate the acceleration of the patient and his bed using Newton’s Second law (F=ma).

### Newton's laws and equilibrium questions

PRACTICE PROBLEMS
Questions pertaining to Newton's laws and equilibrium

### More on Newton's first law of motion

VIDEO 9:32 minutes
Newton's First Law (Galileo's Law of Inertia).

### Newton's first law of motion concepts

VIDEO 7:14 minutes
A little quiz on some of the ideas in Newton's first law

### Newton's second law of motion

VIDEO 7:14 minutes
Newton's Second Law of Motion: F=ma

### Unbalanced forces and motion

VIDEO 6:37 minutes
Thinking about what is true about how unbalanced forces relate to motion and acceleration

### Newton's third law of motion

VIDEO 8:00 minutes
Every action has an equal and opposite reaction

### Center of mass

VIDEO 9:36 minutes
In this video, Sal gives a conceptual understanding of what center of mass means.

### Introduction to torque

VIDEO 9:24 minutes
An introduction to torque