Newton's 1st Law of Motion

© Kesler Science, LLC

Newton’s Laws of Motion

Newton’s First Law or Law
of Inertia
An object at rest tends to stay at
rest unless acted on by an
unbalanced force

Ex. - Sitting on a couch

Inertia – a
tendency to do
nothing or remain
unchanged

© Kesler Science, LLC

Newton’s Laws of Motion

Newton’s First Law (Cont.)
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

List one more example of
Newton’s First Law.

Think About It

© Kesler Science, LLC

Cars, trucks, and SUVs use seatbelts
as safety devices. Roller coasters use
bars. Use Newton’s 1st Law of Motion
to explain how the seatbelt or
restraint bar help keep you safe in a
collision. Be sure to identify forces
and velocity.