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Net Force Challenge
Activity # and Title:
Challenge Question:
If a car is moving at a _______________ speed in a straight line the
forces that would
the car down are
by the
engine force that moves the car
. The result is a _________
_________ force on the car.
A net force is the ___________of_____________ the forces applied to an object.
If a car is ________ _
______________________________.
 It’s not ___________________ __________.
 It’s not ___________________ __________.
 It’s not changing ________________ ______________________.
An object’s _______________ only changes when there is an _______________________
(_____________________) ________ __________ acting on it.
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Force Diagram - a diagram that shows the _____ ______________ applied to an object.
The arrows indicate the relative magnitude (_________________) and direction of the
____________. The arrows are drawn pointing ________________from the object
being drawn.
A
B
The force diagram A represents a block that is being pushed from the left toward the
right with _________N force and from the right toward the left with ___________
force. Assuming the amount of ___________________ between the block and the
table surface is very small will result in a new net force of ________ N toward the right
(Diagram B).
Data & Observations:
Part A (Step 3) Force Diagram: Title your diagram “Zero Net Force”.
Part B (Step 6) Observations:
Part B (Step 7) Force Diagram: Title your diagram “Non-Zero Net Force”.
Part C: (Step 12) Observations:
Part C: (Step 13) Force Diagram: Based on your observation in step 12, title your diagram “Zero Net Force” or “Nonzero Net Force”.
Name
1a. balanced forces example –
Force diagram of above example -
1b. unbalanced forces example –
Force diagram of above example -
2a. Force diagram of above example showing the two forces–
2b. Force diagram show only the net force –
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Remember:
Circle the correct force and explain how you know:
5a. zero net force
non-zero net force
5b. zero net force
non-zero net force
5c. zero net force
non-zero net force
5d. zero net force
non-zero net force
5e. zero net force
non-zero net force

Zero net force means the forces
are balanced
o
Balanced forces show
no acceleration

Non-zero net force means the
forces are unbalanced.
o
Unbalanced forces
show acceleration.
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Conclusions:
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Use the following words to complete each conclusion statement. You may use the words more
than once if needed.
constant
direction
moving
non-zero
rest
speed
zero