Unit 3, Causes of Motion
Exercise 1, Force Diagrams
Draw a system schema with the system boundary drawn around the underlined object. Draw a force diagram and
force addition diagrams for the underlined object in each of the following situations. In the force diagram use a dot to
represent the object and draw each of the forces acting on the object. Each force should be labeled using the
system discussed in class (agent-object notation).
System Schema:
Force Diagram:
Force addition diagram
2. Draw a force diagram System Schema:
for a hockey player,
moving at a constant
velocity, across
frictionless ice.
Force Diagram:
Force addition diagram
3. Draw a force diagram System Schema:
for a baseball player
who slows as he
slides into the base.
Force Diagram:
Force addition diagram
1. A bird sitting
motionless on a
perch.
©Modeling Instruction – AMTA 2014
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U3 Causes of Motion – Exercise 1 NC v.1
4. Draw a force diagram System Schema:
for the bucket of
water that is being
raised from the well
at a constant velocity.
Force Diagram:
Force addition diagram
5. Draw a force diagram System Schema:
for a skydiver who
has just left the plane
and is accelerating
toward the ground.
(Neglect air
resistance)
Force Diagram:
Force addition diagram
6. Draw a force diagram System Schema:
for a skydiver who
has opened the
parachute and is
descending at a
constant velocity.
Force Diagram:
Force addition diagram
©Modeling Instruction – AMTA 2014
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U3 Causes of Motion – Exercise 1 NC v.1
7.
Draw a force diagram System Schema:
for an airplane flying
at a constant velocity
in level flight.
Force Diagram:
Force addition diagram
8.
Draw a force diagram System Schema:
for the water skier
moving at a constant
velocity.
Force Diagram:
Force addition diagram
9. Draw a force diagram System Schema:
for a situation that
you invent. (Describe
the situation)
Force Diagram:
Force addition diagram
©Modeling Instruction – AMTA 2014
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U3 Causes of Motion – Exercise 1 NC v.1