Laboratory: Experiments,
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,Studied planetary motion Johannes Keller
Studied uniform and accelerated motions Galileo Galilei
When two chunks of matter interact, they influence Force
each other. These influences are commonly called
pushes or pulls. What is the formal name of these
influences?
After carefully reading Newton's third law of motion, The two forces are always equal in magnitude under all conditions.
what conditions does it place on the equality of the two
forces resulting from an interaction?
A block slides across a tabletop and, therefore, they The two forces have equal magnitude.
interact with each other. The block applies a downward
force on the table and the table applies an upward
force on the block. How do these two forces compare
in magnitude?
A large truck moving at 30 m/s (67 mph) collides into a The two forces are in opposite directions with the two forces having equal
highway sign on the side of the road. The sign falls over magnitude.
and the truck continues at a slightly slower speed and
merges back into the driving lane. The interaction
between the truck and sign results in the truck applying
a force on the sign and the sign applying a force on the
truck. Which of the following properly relates these two
forces?
Mass is a measure of inertia. Inertia is a property of all of the above.
matter that results in matter resisting
A 3.0 kg tool is loaded on a spaceship and taken to 3.0 kg
Mars. When an astronaut uses the tool to perform
maintenance, what is its mass?
A 2-liter bottle of soft drink has a mass of 2070 g. What 2.07 kg
is this mass in SI units? (Pay attention to units, not just
numerical values.) Enter your result in the third column
of Table 1 in your text.
A 2-liter bottle of soft drink has a mass of 2070 g. What 20.3 N
is the weight in SI units? Enter your result in the fourth
column of Table 1 in your text.
What force does Earth exert on matter that is Gravitational force
commonly called weight?
,What is the weight in SI units of an average Bengal tiger, 2200 N
say 500 lb? Enter your result in the third column of
Table 2 in your text.
What is the mass in SI units of an average Bengal tiger, 224 KG
say 500 lb? Enter your result in the fourth column of
Table 2 in your text.
A soccer ball is sitting stationary in the middle of the -The field applies an upward contact force on the ball.
field. Note that Earth applies a gravitational force and - Earth applies a downward gravitational force on the ball.
the field (ground) applies a contact force . Which of the -The two forces acting on the ball cancel each other such that there is
following statement is true? Mark all correct responses. nounbalanced force.
Which of the following statements are parts of If a body is moving, it will continue to move at constant velocity (speed and
Newton's first law of motion? Mark all correct direction) in the absence of an unbalanced force. If a body is at rest, it will
responses. remain at rest in the absence of an unbalanced force.
What is the difference between speed and velocity? Speed is magnitude only; velocity is magnitude and direction.
Which of the following statements are parts of - When an object is pushed by an unbalanced force, the object will accelerate
Newton's second law of motion? Mark all correct in the direction of the unbalanced force.
responses. - The equation F = ma is a mathematical expression of Newton's second law.
- The resulting acceleration is proportional to the unbalanced force.
Assume that the same unbalanced force is applied to 1.8300 kg truck
each of the following four objects. Rank these objects 2.1800 kg car
according to their accelerations using 1 for the smallest 3. 5 kg can of gasoline
acceleration and 4 for the largest acceleration. 4. 0.93 kg toy doll
Which of the following properly describes the Earth applies a downward force on the helicopter and the helicopter applies an
interaction between a helicopter and Earth? Hint: upward force on Earth with these forces having equal magnitude.
Interactions are between pairs of objects; no other
object should be mentioned except for the helicopter
and Earth.
There are six concepts identified by boxed text in the - When measured in grams (g), the mass is divided by 1000 to give mass in
margins of the experiment theory. In your spreadsheet kilograms.
(and future spreadsheets), you are to summarize three - Inertia is the property of matter that causes matter to resist change in motion.
of the identified concepts. Reviewing the rubric in the - Mass is a measure of inertia
spreadsheet, you should see that you are graded on - The kilogram (kg) is the SI unit of mass
identifying a concept (2 points), defining/describing it
(2 points), and doing so thoroughly (2 points). For
example, consider the concept "mass." Which of the
following are discussed in the text and, therefore,
should be included in a summary of this concept?
, Consider the following evaluation of this experiment: - Explanation of how results support theory.
"Interactions were observed to cause forces (pushes or - Identifying experimental results
pulls) on objects that were studied. The vector nature of - Identifying supporting theory as related to title (in this cases, "interactions")
force was evident in that forces of different magnitudes
acted in different directions (upward, downward,
backward). In all cases, Earth acted downward due to
the force of gravity, which is also called weight."
According to the rubric for the Evaluation (in your
spreadsheet), what three points does this evaluation
make?
Your Reflection (in your spreadsheet) should identify True
experimental result(s), identify experience(s) from
everyday life, and explain how result(s) relate to
experience(s).
Rank the following objects from 1 for the smallest mass 1. styroforam bowl
and 6 for the largest mass. 2. dropper popper
3. tennis ball
4. toy truck
5. baseball
6. two-liter soft drink
Multiply the mass of the single die by ten (10) and yes
compare this result to your mass measurement of ten
dice. The law of conservation of mass states that mass
cannot be created or destroyed; it can only be
rearranged. Within a small error, were your
measurements consistent with this law?
What is the weight in SI units of a 7.5 kg barbell? 73.5 N
What is the weight in SI units of a 25 lb child? 110 N
What is the mass in SI units of an 18 N box? 1.84 kg
Which of the following describes why an object remains An object remains stationary in the absence of an unbalanced force.
stationary?
Assuming the toy truck remained stationary, which of The table must have pushed upward with a force of magnitude equal to the
the following must be true? magnitude of the downward gravitational force.
Which of the following describes why an object remains An object maintains constant velocity in the absence of an unbalanced force.
in uniform motion?