2. Today’s Objectives
After the lesson you will be able to:
1. Describe Newton’s three laws of motion
2. List examples that demonstrate any/all of
Newton’s three laws of motion
3. Isaac Newton
• Click here to view a video about Newton.
• Copy the information below:
• Born on January 4, 1643, in Woolsthorpe, England.
• With discoveries in optics, motion and mathematics,
Newton developed the principles of modern physics.
• In 1687, he published his most acclaimed
work, Philosophiae Naturalis Principia
Mathematica (Mathematical Principles of Natural
Philosophy), which has been called the single most
influential book on physics.
• Newton died in London on March 31, 1727.
4. Newton’s Three Laws of Motion
Explains:
• Rest
• Constant motion
• Accelerated motion
• Effect of balanced and unbalanced
forces
5. Newton’s First Law of Motion
• Inertia: “property of matter that tends to
resist any change in motion”
6. Newton’s First Law of Motion
• Newton’s first law of motion:
– An object at REST will remain at REST,
while an object in MOTION will remain in
MOTION at a constant velocity unless acted
upon by an unbalanced force.
7. Newton’s Second Law of Motion
• Unbalanced forces accelerate objects in the
same direction as the unbalanced force.
• Mass also plays a role.
F = M x A
• Force = mass x acceleration
» 1 Newton (N) = 1 kg x 1 m/sec/sec
8. Newton’s Second Law: Question???
• Which car will have the best gas mileage if
both cars are accelerating at 2 m/s2
?
CAR #1: 750kg
CAR #2: 1000kg
F=750kg x 2m/s2
=1500N
F=1000kg x 2m/s2
=2000N
9. Newton’s Third Law of Motion
• Newton’s third law of motion:
– For every action, there is an equal and
opposite reaction.
ALL FORCES COME IN PAIRS
