Name: _______________________
Per: _____
st
Introduction to Free Body Diagrams (FBD) and Newton’s 1 Law
For each of the situations assigned below complete the Circle Map by a) drawing a motion diagram clearly
indicating the velocity evolution and the acceleration direction (or a=0 if not accelerating); b) describing in words
HOW the object is moving by indicating speed trend (constant, speeding up, or slowing down), direction of motion
(left, right, up, down, or NONE), and direction of acceleration (left, right, up, down, or NONE); c) describing in
words the direction of the net force acting on the object or indicate that it is zero; and d) drawing a free body
diagram (FBD) representing each FORCE acting ON the object as an arrow directed appropriately and with
adequate length to indicate the status of the net force acting on the object. Each arrow should be subscripted to
indicate force TYPE and SOURCE.
Example:
(a) Motion Diagram
(d) F B D
(b) Motion description:
(c) Net force statement:
A rock sits at rest atop a surface.
1)
2)
3)
A rock is dragged rightward at
constant speed across a rough
surface by a string.
The rock sits at rest, unmoving,
tied to the end of a string.
A rock slides rightward at
constant speed across a
frictionless surface.
4)
5)
A rock falls at constant speed
down through the resisting air.
The rock falls freely speeding up
without air resistance.
7)
8)
9)
A rock slides leftward at constant
speed across a frictionless
surface.
A rock is lowered downward at
constant speed by a string.
A rock is dragged leftward at
constant speed across a rough
surface by a string.
6)
A rock is raised upward at
constant speed by a string.
Name: _______________________
Per: _____
Free Body Diagram Construction
Circle Map
Pictorial Representations
Free Body
Diagram
Dynamics
Kinematics
Motion
Diagram
Net Force
Statement
Motion
Description
Verbal Representations