Download NewtonGÇÖs Laws, free fall, and circular motion

Newton’s Laws
Newton’s First Law:
The Law of Inertia
• An object at rest will stay at rest unless acted
upon by a force, and an object in motion will
stay in motion unless acted upon by a force.
• In other words …
Newton’s Second Law:
F=MA
• An object’s acceleration depends on its mass
and the net force acting upon it.
• In other words …
Newton’s Third Law
• For every action there is an equal but opposite
reaction.
• In other words …
Free Fall and Circular Motion
Free Fall
• Free fall is when
acceleration is
caused only by
gravity.
• The longer
something falls, the
faster it falls.
• The speed of
gravity is 9.8 m/s2.
0.0
9.8
19.6
29.4
39.2
Circular Motion
• Centripetal force
causes an object to
move in a circular
motion.
• It is usually a
combination of
forces.
Example: the combination of the ball’s inertia
with the pull of the string causes a centripetal
force and the ball travels in a circle.
Going into Orbit
If you could throw a ball fast
enough and high enough, (about
17,000 mph) it would be equal
to the pull of gravity, creating a
centripetal force.