Force and Motion
Newton’s First Law
Objective:
Physicist will investigate balanced and
unbalanced forces using a simulation to
predict the motion of an object.
Physicist will apply their knowledge of
motion to Newton’s First Law of Motion
Newton's Laws of Motion Vocabulary
Balanced Force
• Two forces acting in
opposite directions on
an object, and equal
in size
• Object stays still or
continues moving at
the same speed and
in the same direction
10N
12N
12N
10N
Newton's Laws of Motion Vocabulary
Unbalanced Forces
• Causes a change in
motion of an object
• Causes
acceleration
Newton's Laws of Motion Vocabulary
Net Force
• The combination of
all forces on an
object
• Measured in
Newtons (N)
14N
10N
Net Force = 4N
Newton's Laws of Motion
Sir Isaac Newton
• An English physicist and
mathematician in the1600’s
• Formulated the three basic
laws of motion (Newton's
Laws of Motion)
Newton's Laws of Motion
Newton’s First Law or Law of Inertia
• Inertia – a tendency to do nothing or remain unchanged
• {art 1: An object at rest tends to stay at rest unless acted on
by an unbalanced force.
Ex. - Sitting on a couch
Newton's Laws of Motion
Part 2: An object in motion tends to stay in motion with
the same speed and direction until acted on by an
unbalanced force.
Ex. - A satellite orbiting Earth