Transcript Newton`s 1st Law

Newton’s Laws of Motion
Unit 4
Vocabulary Foldable (8 section)
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Obtain Paper
Fold into 4 sections
Fold sides inwards, so can open flaps
Cut on lines for each side, 4 flaps/side
Write: Inertia, Mass, Force, Weight, Equilibrium, Friction,
Net Force & Normal Force on flaps
• On back, write Newton’s Laws, 1, 2, & 3 & your name on
bottom
Newton: Isaac not Fig
• Mathematician & Physicist in 1700’s
• Came up with 3 basic ideas that applied to
physics of most motion
• These ideas became Newton’s “Laws” of
motion because they have been tested &
proved many, many times over the years.
Newton's 1st Law & Football
1st Law
• An object at rest remains at rest,
and an object in motion remains in
motion with the same velocity
(speed & direction) unless acted
on by an unbalanced force.
What does this mean?
• If you, or an object, do nothing & nothing
happens to you, you will never go anywhere.
• If you, or an object are moving at a specific
velocity, that’s speed in a specific direction, &
nothing happens to you, or the object, you will
continue going in that direction at the speed,
FOREVER.
• You, or an object do NOT change movement
unless an unbalanced force is applied to you.
Example
• Non-movement
• Golf ball is on tee, will not move until
unbalanced force is applied.
• Movement
• Golf ball hit by golf club (unbalanced
force), golf ball moves.
The golf ball on Earth will eventually stop
moving because of gravity, an external,
unbalanced force.
At your table, state Newton’s 1st law in your own
words & come up with at LEAST 3 examples
Inertia
• Newton’s 1st law is also known as the “Law of
Inertia”.
• Inertia means a tendency to do nothing or
to remain unchanged
• Inertia...examples
Your turn
You have some items at your table, try one or
two of the “tricks” to see it you can
demonstrate inertia
Inertia on Earth
• Items do Not continue moving on Earth
because there are unbalanced forces:
• Gravity
• Friction
• Air resistance (friction due to air)
Inertia vs. Mass
Three Collisions in One Accident
• As a group at your table read the article
“Three Collisions in One Accident”
• As a group, discuss and answer the questions
on the worksheet.
• Turn in the worksheet into your class periods
box when completed.