Name: ______________________________ Block: _____ Date:
__________________
Practice
A RAMP ON THE MOON
As part of a physics demonstration, a 3.0 block slides down a frictionless slope on the surface of
the moon that is half as high as it is long – so that the force of gravity along the slope is half as
great as the weight of the object.
The moon’s gravitational field has a strength of 1.6 N/kg.
Questions:
1.
What is the weight of the block on the moon?
2.
Using the scale to the below, indicate the location and speed of the block for each of the
first three seconds after it is released. Show your calculations in the space available
below or on the back of this page.
Name: _________________________________ Block: ______ Date: ____________________
Poster Project
RAMP POSTER
So far this unit, we have examined the relationship between force and acceleration for objects
on the surface of the Earth. However, just as we saw when we did the Free Fall Poster during
Unit 2, and the Projectile Poster during Unit 3, it is also possible to model the motion of objects
due to gravity on different planets. To do so we, will concepts that we have used in the past,
but we will no longer assume that the gravitational field strength will be 10 N/kg. Instead, the
gravitational field strength will have the same magnitude as the gravitational acceleration, but
different units.
THE ASSIGNMENT
For this assignment, you will use the same planet/moon
as you did for the last two posters. On a piece of legal
paper, make a scale drawing showing the motion of an
object sliding down a ramp that is half as tall as it is
long. (You may remember from geometry that this
ramp will be at a 30o angle). To make this poster
successfully, you will need to remember for this class is
that the object will be pulled with a force that is half the
force that would act on an object falling straight down.
30o
For the purposes of doing calculations, assume that the object has a mass of 3.0 kg. However,
as you create your poster you should feel free to let your imagination go – there will be no
penalty if you decide to make a picture of a car full of clowns or a bucket of boulders sliding
down the hill even though both would have a greater mass than three kilograms.
First, you will need to recall which planet or moon you are using.
Your planet: ______________________________
Field Strength on your planet: _________
Next, you will need to calculate the weight of your object:
w = m gplanet = ______ N
EXPECTATIONS
Your poster should include:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
The name of your planet/moon should be prominently displayed.
Some indication of gravitational field strength (with units) on your planet.
Some display showing the weight of your object (based upon a 3.0 kg mass).
A picture of the hill that fills at least half of the page.
A number line scale along the hill showing how far the object has moved.
An indication of the location of your after each of the first three seconds.
Some indication of the velocity of your object for each of the first three seconds.
A graph showing the speed of your object over time for the first three seconds.
Your calculations for the distance the object has traveled along the hill.
Add color and surface features (as appropriate) to make your poster as attractive as
possible. Extra points will be given for creativity and attention to detail.
When you are done, your
picture will look
something like this one.
Of course, the distance
your projectile moves
downward on your planet
will also be different than
those shown here since
this picture is based upon
the acceleration due to
gravity on Earth’s moon
while your picture will
reflect the gravitational
field strength on your
planet or moon.
Note: A velocity-time graph required for this assignment as well as some indication of the
velocity of your object after each of the first three seconds.
THIS ASSIGNMENT IS DUE AT THE BEGINNING OF THE PERIOD ON THE DAY OF OUR NEXT
UNIT TEST – TWO CLASS PERIODS FROM TODAY.
RAMP POSTER SCORING
Name: _______________________________ Block: _____ Planet: ______________________
General Details:
Planet name displayed
____
Gravitational field strength indicated (with units)
____
Weight of the object indicated (with units)
____
First three seconds labeled with units
____
Picture:
Scale displayed with units (2)
____
Appropriate spacing on scale
____
Correct Speed clearly labeled for 3 seconds (3)
____
Proper Scale Size – Picture at least 6” square
____
Slope is approximately 30o
____
Object Location correctly spaced over time (3)
____
Units included for velocities
____
Graphs correctly labeled
____
Both axes have units (2)
____
Graph has an appropriate title
____
Line correctly drawn
____
Graph:
Sub-Total:
Exceptional Presentation Bonus (3)
Total Score:
_______
+ _____
_____/ 20
Name: ______________________________ Block: ______ Date: ______________________
RUBRIC – FREE FALL POSTER
SEP Standard: 2a. Developing & Using Models
Advanced Mastery
20=100%
Mastery
18 = 90%
Proficient
16 = 80%
Object trajectory and
reflects correct linear
relationship between
time and horizontal
displacement AND a
quadratic relationship
between time vertical
displacement.
Object trajectory and
reflects correct linear
relationship between
time and horizontal
displacement AND a
quadratic relationship
between time vertical
displacement.
One of the two
required dimensions
(horizontal or vertical)
is not displayed
calculated/displayed
correctly.
Horizontal and
vertical velocities are
calculated correctly
and displayed clearly
and appropriately.
Illustration shows
increasing speed but
does not reflect a
linear relationship
between time and
horizontal
displacement and
quadratic relationship
between free fall time
and distance fallen.
Illustration and graph
are scaled to make
maximum use of the
space provided –
Picture dominates
page, notations are
easily readily.
Scale of both
dimensions reflect
mathematical
relationships
consistently.
Picture includes all
required elements.
Illustration and graph
are scaled to make
maximum use of the
space provided.
Picture uses majority
of page and includes
all required elements
A few calculation
errors evident.
Illustration does not
reflect increasing
speed.
Illustration does not
make maximum use
of space.
Some problems with
scaling of horizontal
and vertical axes but
information largely
presented correctly.
Emerging
14 = 70%
Beginning
12 = 60%
Picture does not
reflect expected
mathematical
relationships.
Picture does not
reflect expected
mathematically
relationships.
Several calculation
errors evident.
Significant calculation
errors evident.
Illustration does not
reflect increasing
speed.
No apparent
relationship between
illustration and
expected results.
Illustration and graphs
are present but do not
make maximum use
of space. Some
elements difficult to
see and/or read.
Some required
information not
presented.
Illustration does not
make maximum use
of available space.
Significant
information illegible
or unavailable.
Most elements of a
good picture are
present.
Number lines scaled
correctly only include
some small errors.
Picture includes all
required elements.
Score for Developing and Using Models:
TOTAL SCORE: ____ / 20