First LawLaw of Inertia An object at rest

First Law(Law of Inertia): An object at rest stays at rest or an object in motion, stays in motion (in the same direction/at the same speed) unless acted upon by an unbalanced force

Inertia ü The tendency of an object to resist any change in its motion ü The greater the mass the greater the inertia ü The greater the speed the greater the inertia

Examples of Newton’s 1 st Law (copy 2) a) car suddenly stops and you strain against the seat belt b) when riding a horse, the horse suddenly stops and you fly over its head c) the magician pulls the tablecloth out from under a table full of dishes d) the difficulty of pushing a dead car e) lawn bowling on a cut and rolled lawn verses an uncut lawn f) car turns left and you appear to slide to the right

Examples of Newton’s 1 st Law of IInertia

Second law (Law of Force and Acceleration): ¡ ¡ The greater the force, the greater the acceleration The greater the mass, the greater the force needed for the same acceleration Calculated by: F = ma (F = force, m = mass, a = acceleration)

Examples of Newton’s 2 nd Law of Force and Acceleration (copy 2) a) hitting a baseball, the harder the hit, the faster the ball goes b) accelerating or decelerating a car c) The positioning of football players - massive players on the line with lighter (faster to accelerate) players in the backfield d) a loaded versus an unloaded truck

Third law (Law of Action. Reaction): For every action force, there is an equal and opposite reaction force. (Forces are always paired)

Examples of Newton’s 3 rd Law a) rockets leaving earth b) guns being fired c) two cars hit head on d) jumping out of a boat onto the dock

Examples of Newton’s 3 rd Law