# Momentum and Newton's Laws

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• Momentum and Newton's Laws
• Momentum = mass x velocity
• Conservation of momentum:   Within a closed system, the total momentum in any specified direction remains constant
• Collisions
• Perfectly elastic
• Momentum and total energy are conserved
• Kinetic energy is conserved
• Inelastic
• Momentum and total energy are conserved
• Kinetic energy is NOT conserved
• Kinetic energy is transformed into other forms of energy e.g. heat and sound
• Most collisions are inelastic
• Newton's Laws
• NEWTON'S 1st LAW OF MOTION: An object will remain at rest or keep travelling at a constant velocity unless it is acted on by an external force
• NEWTON'S 3rd LAW OF MOTION: When two bodies interact, the forces they exert on each other are equal and opposite
• NEWTON'S 2nd LAW OF MOTION:The net force acting on an object is directly proportional to the rate of change of momentum of that object. The net force and the change in momentum are in the same direction
• Impulse = Force x Time
• Momentum and Newton's Laws
• Momentum = mass x velocity
• Conservation of momentum:   Within a closed system, the total momentum in any specified direction remains constant
• Collisions
• Perfectly elastic
• Kinetic energy is conserved
• Inelastic
• Kinetic energy is NOT conserved
• Kinetic energy is transformed into other forms of energy e.g. heat and sound
• Most collisions are inelastic
• Newton's Laws
• NEWTON'S 1st LAW OF MOTION: An object will remain at rest or keep travelling at a constant velocity unless it is acted on by an external force
• NEWTON'S 3rd LAW OF MOTION: When two bodies interact, the forces they exert on each other are equal and opposite
• NEWTON'S 2nd LAW OF MOTION:The net force acting on an object is directly proportional to the rate of change of momentum of that object. The net force and the change in momentum are in the same direction
• On a force against time graph, impulse is equal to the area under the graph
• Impulse = change in momentum