Laws of Motion
First Law of Motion: Inertia
Objects in motion, will stay in motion, and objects at rest, will stay at rest, until a force acts upon it.
You just read about the three laws of motion. If you need to refresh about the first law, here is the Page about the first law of motion
NOW TAKE NOTES:
1. Here are some examples of inertia.
Draw at least two of these examples in your science notebook in the circle for the first law of motion, inertia.
-car suddenly stops and your body flies forward and you strain against the seat belt
-when riding a horse, the horse suddenly stops and you fly over its head
-the magician pulls the tablecloth out from under the table full of dishes
-the difficulty of pushing a dead car
-car turns left and you appear to slide to the right
2. Check out some of these inertia demos!
3. Now you try demonstrating inertia with a penny, a notecard and a cup. Place the penny on the card, on top of the cup. Then quickly pull the card and the penny should fall straight down into the cup. The penny (object at rest), wants to stay at rest (sitting where it is at right now), so if you pull the card quick enough, gravity just takes over and it falls. If you move the card slow enough, then you don't see this happen though..
4. Check out this Table Cloth Trick- Inertia
Steve Spangler- table cloth trick explained
5. So, why do we wear seatbelts? And why are there airbags in our car? And how can we do the tablecloth trick? And why do we fall forward when we trip? INERTIA!
Second Law of Motion: Force = Mass x Acceleration
The larger the mass, the more force is required to move it.
If you need to review from the link at the beginning: here's the page about the second law of motion.
1. Now draw at least two of these examples of the second law in the correct circle in your notes:
-hitting a baseball, the harder the hit, the faster the ball goes
-accelerating or decelerating your car (the more gas, the more force, the faster it goes)
-the positioning of football players - massive players on the line with lighter players in the backfield (the larger players can handle the hits and not get moved as much, the smaller mass players can be faster and easier to accelerate)
-a loaded versus an unloaded truck
- pushing over a baby verses pushing over a giant sumo wrester
-trying to push a small box verses a big box (requires more force)
2. Now answer these questions in your science notebook:
Why is it harder for me to push over a sumo wrestler than a small child? ____________
And which item would I have to apply more force to accelerate it, the cup or the desk? _____________
If I hit the ball even harder in baseball, will the ball go even further, or not as far? _____________
Third Law of Motion: Equal and Opposite
For every action, there is an equal and opposite reaction.
If you need some refreshing about the third law of motion. (this is the page from the beginning)
1. Check out this video about equal and opposite in space, pool tables, newton's cradle, and rocketry.
2. Now, draw at least two of these examples in the part of your notes for the last law of motion:
-rockets leaving earth (fire and exhaust push down, rocket flies up)
-guns firing (guns kick in proportion to the size of the bullet)
-two cars hit head on and people in both cars feel the force
-pool or billiards
-jumping out of a boat onto the deck
-walking forward by pushing back
-you sit on the chair, the chair sits on you
-someone punches your face, but that also means your face punches their hand (both hurt)
-pushing down on a diving board to propel yourself up
-squids move with jet propulsion (they push water back and out of their siphons, and that propels them forward)
3. Critical Thinking: Think about Newton's three laws of motion. How do you think Newton's cradle works? Why is it that the ball number is the same on both sides? View a newton's cradle and then discuss and explain in your science notebook.
Newton's Cradle
4. So, Why does a rocket go up? How do we walk forward? EQUAL AND OPPOSITE!
5. Check out this summary of Newton's Laws:
Watch this video with your partners: Newton's Laws of Motion- Hockey
Exit Ticket:
Take a quiz to see how well you know Newton's Laws of Motion. The quiz is on the front table.
Finished and still have some time?
Get the extra credit/extension handout from the front table called Roller Coaster Lab. Then, Go to this link funderstanding.com/slg/coast and ask for the Roller Coaster Lab handout. Complete this and receive 10 tickets!
OR
Practice your vocab with Quizlet.