1. Newton’s Laws of Motion

2. Sir Isaac Newton Born January 4, 1643 in England
As a young student, Newton didn’t do well in school.
He worked hard and continued his education.
Later in life, Newton contributed ideas that became law in the worlds of science and math.

3. Newton’s Law of Inertia
“An object at rest, tends to stay at rest, and an object in motion, tends to stay in motion with the same speed and in the same direction, unless acted upon an outside force.”
Objects resist change in motion.
The more mass an object has, the greater its inertia.

4. Newton’s Law of Force and Acceleration
F = ma
Net force on object = mass of object x acceleration

5. For example…
If the force remains constant, smaller masses will have greater acceleration compared to larger masses.
If the force remains constant, larger masses will have less acceleration compared to smaller masses.
F=ma F=ma

6. For example…
small mass = greater acceleration large mass = less acceleration

7. Newton’s Law of Force and Acceleration
If the mass of an object remains constant, then acceleration increases as the force increases. ALWAYS identify the force, mass, and acceleration variables to see which ones are constant.

8. Force
Force (N) = mass (kg) x acceleration (m/s2) F ÷
m x a

9. Force
Acceleration (m/s2) = force (N) ÷ mass (kg) F ÷
m x a

10. Force
Mass (kg) = force (N) ÷ acceleration (m/s2) F ÷
m x a

11. Newton’s Law of Action-Reaction
"For every action, there is an equal and opposite reaction."
Reaction
Action

12. Newton’s Law of Action-Reaction
All forces act in pairs.
The action force acts on one object, while the reaction force acts on a second object.
This is not a cause-effect relationship.
The forces occur simultaneously.