gravity. warm up: 1.what are your ideas about gravity? ◦what is it? ◦what causes it? ◦what...
TRANSCRIPT
Warm Up:
1. What are your ideas about gravity? ◦What is it? ◦What causes it? ◦What changes it? ◦How does it affect things?
2. What variables do you think affect gravitational force?
Objective/ SWABAT:
Predict how the gravitational force between two bodies would differ for bodies of different masses or different distances apart.
WA St Standard PS1F
Explore what affects gravity using Gravity Force Lab applet
1. Go to: http://phet.colorado.edu/en/simulation/gravity-force-lab
2. Click the to run the program.
3. COPY and Answer questions 1-6 in your journal
Warm Up:1. When considering gravity, where is the distance between the objects
measured from?
2. What is an
independent (manipulated)
and dependent (responding)
variable?
Hint: DRY MIX
Collect and graph dataToday you will create three graphs relating independent variables to the gravitational forces experienced by the objects.
These graphs will be turned in.
Graph dataToday you will create three graphs relating independent variables to the gravitational forces experienced by the objects.
Tomorrow these graphs are due!If you complete these graphs. Please begin on the questions 1-9, due Friday.
Warm Up: Show me your amazing graphs1. Get out the graphs you created2. Check to make sure each has labeled axes, title,
units, data table, trend line and YOUR NAME 3. What does this graph mean?
Whiteboard and Interpret
In 6.42 minutes…or less to prepare, then we will present the whiteboards.1. Graph the shape of your assigned independent
variables to the gravitational forces experienced by the objects.
2. Write 2 statements that describe the relationship of the variables graphed
3. Present your board
Discuss with your group which two variables you believe affect gravity the most.
Review of Gravity
Objective/SWBAT: Explain how weight of an object can change while its mass remains constant.
WA St Standard PS1F
Can you calculate the attractive force you and the Earth experience because of each other?
Careful with units!•Radius of the Earth is 6,371 km. (needs to be in meters)•Mass of the Earth is
5.974 x 10^24 kg.•1 kg = 2.2 lb•N= (kg m) /s2
School House Rocks GRAVITY
http://www.universetoday.com/34824/force-of-gravity/
White board your portionWhole classTake DETAILED Notes
Calculate the attractive force you and the Earth experience because of each other.
Careful with units!•Radius of the Earth is 6,371 km. (needs to be in meters)•Mass of the Earth is
5.974 x 10^24 kg.•1 kg = 2.2 lb•N= (kg m) /s2
School House Rocks GRAVITY
Warm Up:What is acceleration?What causes an object to accelerate?How might acceleration relate to gravity?
Acceleration1. Acceleration is a change in direction or speed
of an object.2. Acceleration is caused by a net force acting
on an object.
Does this data show acceleration? What is causing the velocity to change?
What is the shape of a velocity: time
graph for this data?
Position is changing at a NON-CONSTANT rate, Velocity is changing
Velocity is changing at a CONSTANT rate, acceleration is constant
Rate of acceleration is CONSTANT- 9.8 m/s2 on Earth
Confused? Fg and g
Fg is the mutual force created by the 2 objects interacting. g is the acceleration due to gravity.
Entry task: Bowling ball and a Soccer Ball(on a half sheet with your name):
Write a claim of which ball will hit the ground first. Then…Explain which will hit first a bowling ball or a soccer ball using force diagrams.
1. Draw 2 force diagrams.
2. One that shows the forces acting on a bowling ball as it falls.
3. The other showing the forces acting on a soccer ball as it falls.
What falls faster?A feather or a bowling ball?
https://www.youtube.com/watch?v=E43-CfukEgs
Exit ticket Explain which will hit first a bowling ball or a soccer ball using force diagrams.1. Draw 2 force diagrams.2. One that shows the forces acting on a bowling ball as it
falls.3. The other showing the forces acting on a soccer ball as it
falls.4. Add a statement about what might change with terminal
velocity
Free Fall- the affect of acceleration and inertia
http://www.telegraph.co.uk/news/science/space/9849206/Felix-Baumgartner-fell-faster-than-we-thought-supersonic-skydiver-hit-Mach-1.25.html
http://arstechnica.com/science/2012/10/skydiver-breaks-speed-of-sound-after-jumping-from-edge-of-space/
Terminal Velocity https://www.youtube.com/watch?v=9imImfmt2BE
Warm Up:Make sure you have the value of “g” written in your notes. Notes can be used on the Quest tomorrow.
Now that you know the acceleration due to the force gravity is 9.81 m/s2… I bet you are wondering where that number comes from, right?
See how “g” applies Do you weigh the same on Earth and the moon? Why is that?
?
?
Putting it all together…1. What 3 variables affect gravitational force?2. What is Newton’s Law of Gravitation?3. What is Newton’s second law?
You may calculate the gravitational
force on the astronaut on the Earth given the
Following:
Radius of the Earth 6,371,000 m
Mass of the Earth 5.974 x 10^24 kg
g = 9.81 m/s/s
Putting it all together… Why is it that the weight of the astronaut changes?
What 2 variables affect gravitational force?
What is Newton’s Law of Gravitation?
What is Newton’s second law?
You may calculate
the gravitational
force on the
astronaut on the moon given the
Following.
Radius of the Earth 6,371,000 m
Radius of the Moon 1,737,100 m
Mass of the Earth 5.974 x 10^24 kg
Mass of the Moon 7.347 x 10^22 kg
Write it on you whiteboard. Show your math.
g = 9.81 m/s/s
g = ?
Calculate weight (force due to gravity) in the following problems by using the equation:
weight = mass x free-fall acceleration w = m gg (on Earth) = 9.8 m/s2
(1) ALWAYS write the equation(2) plug in the numbers and units,(3) give the answer with the correct units.
1. A physical science text book has a mass of 2.2 kga) What is the weight on the Earth? b) What is the weight on Mars (g = 3.7 m/s2)
2. If the textbook weighs 19.6 newtons on Venus, What is the strength of gravity on Venus?
3. Of all the planets in our solar system, Jupiter has the greatest gravitational strength. If a 0.5 kg pair of running shoes would weigh 11.55 newtons on Jupiter, what is the strength of gravity there?
4. If he same pair of shoes weighs 0.3 newtons on Pluto, what is the strength of gravity on Pluto?
5. What does the pair of shoes weigh on Earth?
http://www.history.com/shows/the-universe/videos/the-universe-gravity
Senate Constitutional Convention:
The Universe: Gravity Episode
Please answer the Guided Questions