Directions
• Copy down ALL of the answers in BLUE,
writing in complete sentences!
• I recommend studying theses answers as they
are most of the questions on the assessment
on Tuesday
Inquiry 15.1
#3
• What force is acting on the marble?
–Gravity is the force acting on the marble.
Inquiry 15.1
#6
• How did question 4 demonstrate the law of
inertia?
– The marble fell until it hit the sand.
Inquiry 15.1
#7
• How does the marble move as it falls off the
ruler? (Straight down or at an angle?)
– The marble falls at an angle not straight down.
Inquiry 15.1
#10
• How does the forward speed of the marble
affect the motion of the marble once it leaves
the ruler?
– The faster the speed the further the distance.
• How much farther did the marble travel from
high speed to low speed?
– In the table the marble fell 4.9 cm farther at the
higher speed.
Inquiry 15.1
#12
• Describe the path of something that has
forward motion but is also being pulled down
by gravity.
– Sun’s force of gravity is pulling each planet towrds
it. But the planets are trying to move forward in a
straight line.
Inquiry 15.1
#13
• Which part of an object that is
falling towards the Earth feels a
stronger gravitational pull?
– The bottom because it is closer to
the center of the Earth.
Inquiry 15.1
#14
• Why does a rocket have to
work harder when it is not
orbiting an object?
– The closer you are to the object
(Planet) the rocket is having to
fight gravity, when the rocket is
in orbit, the rocket is far enough
away that the force of gravity is
very weak.
Inquiry 15.1
#15
• Why doesn’t a satellite we put into space
come crashing back into the Earth or float
away?
– The satellite is trying to move forward (away) in a
straight line but Earth’s gravity is pulling on it,
creating a curved orbit.
Inquiry 15.1
#16
• How does gravity affect an object that is in
motion?
– The gravity causes an object that is in motion to
move in a curve (or angle) not a straight line.
Inquiry 15.2
#2
• Describe the motion of the marble.
• The marble is not moving
Inquiry 15.2
#4
• How does the metal ring produce an
unbalanced force that influences the marble’s
motion?
– The metal ring is pushing on the marble causing
the marble to move.
Inquiry 15.2
#6
• What happens to the marble when you lift the
metal ring?
– The marble goes and crashes into the walls of the
container.
Inquiry 15.2
#14
• What is a balanced force?
– Equal amounts of force pushing in opposite
directions, causing no movement.
Inquiry 15.2
#15
• What is an unbalanced force?
– Where one force on an object is greater than
another.
Inquiry 15.2
#16
If Mr. K pushes on a chair with a force
of 10 N and Mr. R pushes in the
opposite direction with a force of 3N.
Which way will the chair move?
The chair will
move towards
Mr. R.
Inquiry 15.2
#17
• If Mr. G and Mr. R push a chair in the same
direction each with a force of 6N and Mr. K
pushes the chair in the opposite direction with
a force of 10 N, which way will the chair
move?
– Mr. G and Mr. R total 12 N and Mr. K totals 10 N,
so the chair will move towards Mr. K.
Inquiry 15.3
#5
• What is the path of the marble like around the
water balloon?
– The marble went in an oval (ellipse) not in a
circular orbit.
Inquiry 15.3
#8
• Which planet do you think would have the
fastest orbital speed?
– Mercury would have the fastest orbital speed.
Inquiry 15.3
#9
• What evidence do you have to support your
answer to question 8?
– The Closer the marble was to the balloon the
faster the marble orbital speed was.
Inquiry 15.3
#11
• Why do stars wobble?
– Planet's orbiting the stars pull on the stars causing
them to wobble.
Inquiry 15.4
#5
• How long does it take the moon orbiter to go
around 10 times with 5 washers?
– Times will vary but should be over 4 seconds in
your data table.
Inquiry 15.4
#8
• How long does it take the moon orbiter to go
around 10 times with 25 washers?
– Times will vary but should be under 4 seconds.
Faster!
Inquiry 15.4
#10
• Which has more mass Jupiter or Earth?
– Jupiter has far more mass.
Inquiry 15.4
#13
• Which planetary satellite travel faster (has a
greater orbital speed)?
– Io’s speed is faster.
Inquiry 15.4
#16
• How does a planet’s gravitational force affect
a moon’s orbital speed?
– The greater the gravitational force the faster a
moon’s orbital speed will be!
Rotating Sky#5
• What is a geocentric system?
– A system where earth is at the center.
Rotating Sky
##7
• What is a heliocentric system?
– A system where the Sun is at the center.
Rotating Sky
#9
• How did Galileo’s observations of Jupiter's
moons prove that everything didn’t revolve
around the Earth?
– There were 4 moons orbiting Jupiter. If something
orbited another object other than Earth, than
everything in the Solar system did not go around
the Earth.
Rotating Sky
#11
• What 2 facts keep a planet in orbit?
– Inertia – planet moving forward
– Gravity – planet being pulled towards the Sun.