1. Newton’s 3 rd Law of Motion Ch 3 Sect 3

2. 3 rd Law To every action force there is an equal and opposite reaction force To every action force there is an equal and opposite reaction force Ex #1 Person jumping on a trampolineEx #1 Person jumping on a trampoline Action Force = Person pushing down on trampoline causes it to stretch Action Force = Person pushing down on trampoline causes it to stretch Reaction Force = Trampoline goes back to its original shape and shoots you up Reaction Force = Trampoline goes back to its original shape and shoots you up

3. 3 rd Law (continued) Ex #2 Person SwimmingEx #2 Person Swimming Person pushes on the water (action force) Person pushes on the water (action force) Water pushes back causing the swimmer to propel forward (reaction force) Water pushes back causing the swimmer to propel forward (reaction force) Ex #3 Rocket PropulsionEx #3 Rocket Propulsion Explosion of gases in a sealed chamber leave out the back end (action force) Explosion of gases in a sealed chamber leave out the back end (action force) Sealed chamber moves forward (reaction force) Sealed chamber moves forward (reaction force) Rocket Propulsion Rocket Propulsion Rocket Propulsion Rocket Propulsion

4. Momentum Property an object has because of its mass and velocity Property an object has because of its mass and velocity How much umph or force an object has that is moving and has mass How much umph or force an object has that is moving and has mass More mass = more momentum More mass = more momentum More velocity = more momentum More velocity = more momentum P = Momentum, M = Mass, V = Velocity P = Momentum, M = Mass, V = Velocity P = M (kg) x V (m/s 2 ) P = M (kg) x V (m/s 2 )