On each Page, you are to describe that law of motion, in your own words, and provide an illustration that demonstrates that law of motion.
• Neatness will be taken into consideration for your grade.– Requirements for each page:
1. Front Page is the title Page- Newton’s Laws & Your Name
2. Newton’s First Law of Motion3. Second Law of Motion4. Third Law of Motion 5. Universal Law of Gravitation6. Last Page is One Picture with all Laws
applied to it.
Bill Nye Forces
Laws of Motion
New
ton’s
Forces
• A force is any push, or pull, on an object– Measured in Newtons - N– Vector Quantity – Direction Matters
• Same = add Opposite = Subtract
Free Body DiagramsFree Body Diagrams(Force Diagrams)(Force Diagrams)
– Represent all forces acting on an object
• Many types of forces!
– Draw all forces acting on an object & Label
– To scale– Proper direction
Net Force
same as
Sum of all forces acting on an object is called net force or total force
BRICK
3 Newtons5 Newtons
8 Newtons
Check Yourself
?
Weight
• Weight is a force– Force due to gravity (more on that later!)
• Acts downwards (towards earth) always!!!
• W=mg
g=9.8m/s/s
Normal Force
Solid surfaces exert a force, called a normal force (support force), on objects pressed against them.
100 NewtonSupport force
Downward force (weight) balanced by upward force (normal).
100 NewtonGold Brick
Weight Practice
• Calculate the Weight of:• 10 kg book x 9.8 m/s/s = 98 Newtons
• 500 kg table x 9.8 m/s/s = 4900 Newtons
• 100 kg person x 9.8 m/s/s = 980 Newtons
Friction
• Always opposes the motion of the object
Force Diagram Practice
• Draw out the following force diagrams in Your Notebook– A text book on the table– A ball falling– Holding an apple in your hand– Pushing a shopping cart to the right
Force Diagram Practice
Newton’s First Law of Motion
Law of InertiaLaw of Inertia
An object at rest remains at rest and an object in motion* remains in motion, unless acted upon by an outside force
*Moving in a straight line with
constant speed.
More mass = More Inertia =
More Resistance to Change its State of Motion
Think of Football PlayersThink of Football Players
Or Pushing a shopping cartOr Pushing a shopping cart
So……..
• If this law is true….why does the object stop???
Is Newton Wrong?!?!
Newton’s Law is True!
Another force acts on the object, which slows the object down
This force is called Friction
Friction
• Always opposes the motion of the object
On the surface….
Origin of friction is molecular interaction between solid surfaces.
• Friction is complicated. • Friction depends on support force and
on properties of the surface.