Download Free Body Diagrams and Balance

Free
Body
Diagrams
and
Balance
Warm Up
1) What is net force?
2) What are the 5 types of
forces?
3) What is the equation for
Force?
4) Which of Newton’s Laws
is the force equation?
Free Body Diagrams
Free Body Diagrams are used to find the net
force or overall force that an object
experiences.
This will tell us which direction an object will
accelerate in.
Remember that Force = Mass * Acceleration
If all of the forces acting on an object are
perfectly balanced, the object is at equilibrium
This means that its motion will not be changed
40N North
40N West
40N East
40N South
Changes in movement only occur due to unbalanced
forces!
Remember that an object in motion/at rest remains
in motion/at rest unless acted on by an UNBALANCED force
60N North
40N West
40N East
40N South
If an object is not
moving, is the normal
force or the
gravitational force
larger?
They are Equal/Balanced
Fnormal
Fgravity
Remember that the object will move in the
direction of the net force!
What is the net force on the ball below?
0 Newtons!
20N
20N
What is the net force on the crate below?
30N
50N
80 Newtons!
What is the net force on the log and duck below?
10N South
50N North
40N West
40N East
60N South
What is the net force on the log and duck below?
10N South
50N North
40N West
50N East
60N South
Drawing Free Body Diagrams
Imagine a soccer ball is kicked horizontally down
a field of grass. Draw a free body diagram to
show the forces acting on the ball.
Ffriction
Fnormal
Fapplied
Fgravity
Imagine a soccer ball is rolling down a slope
now. Draw a free body diagram to show the
forces acting on the ball.
Fnormal
Ffriction
Fapplied
Fgravity
Draw a free body diagram for a box that is being
held up diagonally by 2 people.
Draw a free body diagram for a box that is being
held up by a string