MOTION THE LAWS OF NEWTON
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Transcript of MOTION THE LAWS OF NEWTON
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MOTIONTHE LAWS OF NEWTON
Ostmann ScienceKate Bond Middle School
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In Newtons lingua…1. Every body perseveres in its state of rest, or
of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.
2. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
3. To every action there is always opposed an equal and opposite reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
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NEWTONS FIRST LAWIS ALSO CALLED… LAW OF INERTIA
SOCCER BALL STAYS AT REST UNTIL
PLAYER KICKS IT!
GIANT SNOWBALL
Tendency to stay the same
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NEWTON’S SECOND LAW
F = m x a
OR
How quickly an object changes speed depends on it’s mass and the magnitude of the force acting on it.
a = F/ m a = F/ m
The second law is an equation that relates force, mass, and acceleration.
Mass stayed the same
Force got smaller
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NEWTONS THIRD LAW
For every action...
…there is as an equal and opposite…
…REACTION.
The third law in SPACE
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MASS VS. WEIGHT
WEIGHT
A measurement of an object’s force.
Whose mass is greater, the man on the earth or the moon?
TRICK QUESTION!
YOUR MASS IS THE SAME ON THE MOON AS IT IS ON EARTH.
MASS
A measurement of how much matter an object has.
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Speed vs. Velocity
Velocity = 0 m/s
Speed = 17.08 m/s
Same start and end point = didn’t go anywhere
Horse won the race by traveling 17.08meter/second over 10 meters
Displacement
Distance
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SPEED
Describes how fast an object is moving.
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HOW FAST AN OBJECT IS MOVING IN A CERTAIN DIRECTION
VELOCITY
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MOMENTUM
VELOCITY
= (MASS) X (VELOCITY)
The larger the mass, the greater the momentum
The greater the velocity, the greater the momentum.
The force an object has due to it’s movement.Object must be moving.
VELOCITY
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Laws of Motion:RAPRAP
HOMEWORK: Write your own song, rap, poem or story about Newton’s Laws of Motion.
Your composition must include the following:1. Explanation of Law 12. Example of Law 1 from everyday life3. Explanation of Law 2 ( must include the equation F=m*a)4. Example of Law 2 from everyday life5. Explanation of Law 36. Example of Law 3 from everyday life
DUE: TOMORROW!
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Case Study: Luciano’s Pound Puppies
Circus Physics DOGS
QUESTIONS TO CONSIDER WHILE WATCHING THE VIDEO
1. What forces do you see in the video?
2. Why does the dog slide down the slide?
3. Which of Newton's Laws applies when the dog jumps off of Luciano?
4. What is an example of Newton's First Law?
5. What is an example of Newton's Third Law?
HOMEWORK:
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Digging Deeper:Newton’s 1st law
QUESTION: Why doesn’t the dog fall to the ground while he leaps through the hoop?
HE HAS INERTIA
Gravity
Uninterrupted forward force
The dog will keep moving until a force like gravity pulls him down.
Gravity pulls on the dog at a constant rate downward.
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Digging Deeper:Newton’s 2nd Law
To find the dog's acceleration, we can use Newton's 2nd Law:Net Force = Mass x Acceleration OR "F = ma".
The dog’s net force pulls him down the slide.
How fast is his acceleration as he slides down?
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Digging Deeper:Newton’s 3rd Law
Lucky the dog jumps off of Luciano, causing Lucky to momentarily accelerate horizontally at 2.45 m/s2.
If the dog has a mass of 15 kg and Luciano has a mass of 80 kg, what horizontal acceleration does Luciano feel?HINTs:
Luciano and the dog experience the same force.F = ma
M = 80kga = ?
m = 15 kgA = 2.45 m/s2
M x a = m x A(80kg)a = (15kg)(2.45m/s2)
a = (15kg)(2.45m/s2)80kg
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Journal Assessment
Write a paragraph summarizing this presentation.
Your summary must be at least TEN sentences long to get full credit.
Use your notes to help you remember the concepts addressed in the presentation.
Remember to include introductory and conclusion sentences.
If you are confused about a topic, write your question in the summary.