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Motion and forces

1. Motion & Forces
Defining Force

Force
 Newton’s First Law
 Friction

2. Force
Force
a push or pull that one body exerts on
another
What forces are being
exerted on the football?
F
kick
F
grav

3. Force
Net Force
unbalanced forces that are not
opposite and equal
velocity changes (object accelerates)
F
friction
W
F
pull
F
net
NN

4. Balanced Forces
When two or more forces act on an object at the same
time, the forces combine to form the net force
The net force on the box is zero because the two forces
cancel each other.
Forces on an object that are equal in size and opposite
in direction are called balanced forces.

5. Force
Balanced Forces
forces acting on
an object that
are opposite in
direction and
equal in size
no change in
velocity

6. Unbalanced Forces
When two students are pushing with unequal forces in
opposite directions, a net force occurs in the direction
of the larger force.
The net force that moves the box will be the difference
between the two forces because they are in opposite
directions.
They are considered to be unbalanced forces.