Newton’s First Law
An example
• Also called “Newton’s Law of Inertia”
Inertia
• An object’s tendency to resist a change in motion
Newton’s Second Law
F = m x a
Newton’s Second Law
• Part 1: Acceleration depends on mass
• Part 2: Acceleration depends on force
Example: Mr. Parzych Bowling
How much force is need for a bowling ball with a mass of 5 kg to be accelerated at a rate of 2 m/s/s?
Example: Mr. Parzych Bowling
F = m x a
F= (5 kg) * ( 2 m/s/s)
F= 10 N
a= 2 m/s/s
m= 5 kg
Action and Reaction Forces
Examples of Force Pairs
Pushing Against A Wall
Effects of Reaction Forces
• Hard to see the effect of the ball pulling on the earth.
• The earth is extremely massive, so it’s acceleration will be infintessimally small
• F= m x a
Momentum• Momentum is the combined mass and velocity of an
object.
Transfer of Momentum
Conservation of Momentum