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WorksheetsIntro to Free Body Diagrams (Newton's Laws)
Total questions: 10
Worksheet time: 50mins
Introduction to Free Body Diagrams
(0:39). What is a correct term that means "the force of gravity"?
weight
support
friction
free-fall
tension
(01:39). Which of the following is a correct symbol for the force of gravity?
Fg
G
fkg
N
In which direction does the force of gravity ALWAYS work?
generally downward, but it may be different if the surface it is on is not horizontal.
straight down
up, away from the surface
opposite the direction of any frictioin
(03:05) A "normal" force is a force that...
always points straight up and always pushes on a body.
is always perpendicular to the surface and may pull or push on a body.
always points straight up and may pull or push on a body.
is always perpendicular to the surface and always pushes on a body.
(03:30) The length of a force vector on a free-body diagram represents...
See answer explanation for important note:
the time the force acts.
the direction of the force
the type of force
the magnitude (size) of the force.
(04:12) Which of the following best explains why the diagram shown here must be incomplete?
The arrow representing Fa should be drawn as the same size as Fg and Fn.
Actually, the diagram is complete -- the book is not changing its motion because the three forces shown cancel each other out.
There must be a friction-force acting in the same direction as Fa.
Since the book is not accelerating, there must be some other force of equal size acting in a direction opposite Fa.
(06:13) Friction is necessary to prevent the book from starting to accelerate down the ramp. In which direction must friction act to prevent sliding.
up and to the right, parallel to the ram, opposite the direction sliding would occur.
straight down, toward the center of the Earth.
down and to the right, perpendicular to the ramp and directly opposite the normal force, Fn.
straight up, away from the center of the Earth.
down and to the left, parallel to the ramp and in the direction sliding would occur.
(06:35) True or False - the book is not accelerating.
True
False
True or False - the net force on the book is zero.
True
False
True or False - all the forces acting on the book are equal in magnitude.
True
False
